diff --git a/Wino.Calendar.ViewModels/AccountManagementViewModel.cs b/Wino.Calendar.ViewModels/AccountManagementViewModel.cs
index ae78ede5..70b6108d 100644
--- a/Wino.Calendar.ViewModels/AccountManagementViewModel.cs
+++ b/Wino.Calendar.ViewModels/AccountManagementViewModel.cs
@@ -125,7 +125,7 @@ namespace Wino.Calendar.ViewModels
                     Type = MailSynchronizationType.UpdateProfile
                 };
 
-                var profileSynchronizationResponse = await WinoServerConnectionManager.GetResponseAsync<MailSynchronizationResult, NewSynchronizationRequested>(new NewSynchronizationRequested(profileSyncOptions, SynchronizationSource.Client));
+                var profileSynchronizationResponse = await WinoServerConnectionManager.GetResponseAsync<MailSynchronizationResult, NewMailSynchronizationRequested>(new NewMailSynchronizationRequested(profileSyncOptions, SynchronizationSource.Client));
 
                 var profileSynchronizationResult = profileSynchronizationResponse.Data;
 
@@ -141,11 +141,13 @@ namespace Wino.Calendar.ViewModels
             accountCreationDialog.State = AccountCreationDialogState.FetchingEvents;
 
             // Start synchronizing events.
-            var eventsSyncOptions = new MailSynchronizationOptions()
+            var synchronizationOptions = new CalendarSynchronizationOptions()
             {
                 AccountId = createdAccount.Id,
-                Type = MailSynchronizationType.Events
+                Type = CalendarSynchronizationType.CalendarMetadata
             };
+
+            var synchronizationResponse = await WinoServerConnectionManager.GetResponseAsync<CalendarSynchronizationResult, NewCalendarSynchronizationRequested>(new NewCalendarSynchronizationRequested(synchronizationOptions, SynchronizationSource.Client));
         }
     }
 }
diff --git a/Wino.Calendar.ViewModels/AppShellViewModel.cs b/Wino.Calendar.ViewModels/AppShellViewModel.cs
index a7de7e14..23376be1 100644
--- a/Wino.Calendar.ViewModels/AppShellViewModel.cs
+++ b/Wino.Calendar.ViewModels/AppShellViewModel.cs
@@ -1,6 +1,5 @@
 using System;
 using System.Globalization;
-using System.Linq;
 using System.Threading.Tasks;
 using CommunityToolkit.Mvvm.ComponentModel;
 using CommunityToolkit.Mvvm.Input;
@@ -8,13 +7,14 @@ using CommunityToolkit.Mvvm.Messaging;
 using Wino.Core.Domain.Collections;
 using Wino.Core.Domain.Enums;
 using Wino.Core.Domain.Interfaces;
-using Wino.Core.Domain.MenuItems;
 using Wino.Core.Domain.Models.Calendar;
 using Wino.Core.Domain.Models.Navigation;
+using Wino.Core.Domain.Models.Synchronization;
 using Wino.Core.Extensions;
 using Wino.Core.ViewModels;
 using Wino.Messaging.Client.Calendar;
 using Wino.Messaging.Client.Navigation;
+using Wino.Messaging.Server;
 
 namespace Wino.Calendar.ViewModels
 {
@@ -22,18 +22,17 @@ namespace Wino.Calendar.ViewModels
         IRecipient<VisibleDateRangeChangedMessage>,
         IRecipient<CalendarEnableStatusChangedMessage>,
         IRecipient<CalendarInitializedMessage>,
-        IRecipient<NavigateManageAccountsRequested>
+        IRecipient<NavigateManageAccountsRequested>,
+        IRecipient<GoToCalendarDayMessage>
     {
         public event EventHandler<CalendarDisplayType> DisplayTypeChanged;
         public IPreferencesService PreferencesService { get; }
         public IStatePersistanceService StatePersistenceService { get; }
         public INavigationService NavigationService { get; }
         public IWinoServerConnectionManager ServerConnectionManager { get; }
-        public MenuItemCollection FooterItems { get; set; }
-        public MenuItemCollection MenuItems { get; set; }
 
         [ObservableProperty]
-        private IMenuItem _selectedMenuItem;
+        private int _selectedMenuItemIndex = -1;
 
         [ObservableProperty]
         private bool isCalendarEnabled;
@@ -62,10 +61,13 @@ namespace Wino.Calendar.ViewModels
         [ObservableProperty]
         private int _selectedDateNavigationHeaderIndex;
 
+        private readonly IAccountService _accountService;
+
         public bool IsVerticalCalendar => StatePersistenceService.CalendarDisplayType == CalendarDisplayType.Month;
 
         public AppShellViewModel(IPreferencesService preferencesService,
                                  IStatePersistanceService statePersistanceService,
+                                 IAccountService accountService,
                                  INavigationService navigationService,
                                  IWinoServerConnectionManager serverConnectionManager)
         {
@@ -74,6 +76,7 @@ namespace Wino.Calendar.ViewModels
             PreferencesService = preferencesService;
 
             StatePersistenceService = statePersistanceService;
+            _accountService = accountService;
             StatePersistenceService.StatePropertyChanged += PrefefencesChanged;
         }
 
@@ -93,20 +96,37 @@ namespace Wino.Calendar.ViewModels
         {
             base.OnNavigatedTo(mode, parameters);
 
-            CreateFooterItems();
             UpdateDateNavigationHeaderItems();
         }
 
-        partial void OnSelectedMenuItemChanged(IMenuItem oldValue, IMenuItem newValue)
+        partial void OnSelectedMenuItemIndexChanged(int oldValue, int newValue)
         {
-            if (newValue is SettingsItem)
+            switch (newValue)
             {
-                NavigationService.Navigate(WinoPage.SettingsPage);
+                case -1:
+                    NavigationService.Navigate(WinoPage.CalendarPage);
+                    break;
+                case 0:
+                    NavigationService.Navigate(WinoPage.AccountManagementPage);
+                    break;
+                case 1:
+                    NavigationService.Navigate(WinoPage.SettingsPage);
+                    break;
+                default:
+                    break;
             }
-            else if (newValue is ManageAccountsMenuItem)
+        }
+
+        [RelayCommand]
+        private void Sync()
+        {
+            var t = new NewCalendarSynchronizationRequested(new CalendarSynchronizationOptions()
             {
-                NavigationService.Navigate(WinoPage.AccountManagementPage);
-            }
+                AccountId = Guid.Parse("52fae547-0740-4aa3-8d51-519bd31278ca"),
+                Type = CalendarSynchronizationType.CalendarMetadata
+            }, SynchronizationSource.Client);
+
+            Messenger.Send(t);
         }
 
         /// <summary>
@@ -142,14 +162,6 @@ namespace Wino.Calendar.ViewModels
             return DateTime.Today.Date;
         }
 
-        protected override void OnDispatcherAssigned()
-        {
-            base.OnDispatcherAssigned();
-
-            MenuItems = new MenuItemCollection(Dispatcher);
-            FooterItems = new MenuItemCollection(Dispatcher);
-        }
-
         public override void OnPageLoaded()
         {
             base.OnPageLoaded();
@@ -160,13 +172,6 @@ namespace Wino.Calendar.ViewModels
             });
         }
 
-        private void CreateFooterItems()
-        {
-            FooterItems.Clear();
-            FooterItems.Add(new ManageAccountsMenuItem());
-            FooterItems.Add(new SettingsItem());
-        }
-
         #region Commands
 
         [RelayCommand]
@@ -236,6 +241,8 @@ namespace Wino.Calendar.ViewModels
         // Calendar page is loaded and calendar is ready to recieve render requests.
         public void Receive(CalendarInitializedMessage message) => Messenger.Send(new GoToCalendarDayMessage(DateTime.Now.Date));
 
-        public void Receive(NavigateManageAccountsRequested message) => SelectedMenuItem = FooterItems.FirstOrDefault(a => a is ManageAccountsMenuItem);
+        public void Receive(NavigateManageAccountsRequested message) => SelectedMenuItemIndex = 1;
+
+        public void Receive(GoToCalendarDayMessage message) => SelectedMenuItemIndex = -1;
     }
 }
diff --git a/Wino.Calendar.ViewModels/CalendarPageViewModel.cs b/Wino.Calendar.ViewModels/CalendarPageViewModel.cs
index a4f579c9..0f4f2500 100644
--- a/Wino.Calendar.ViewModels/CalendarPageViewModel.cs
+++ b/Wino.Calendar.ViewModels/CalendarPageViewModel.cs
@@ -375,62 +375,62 @@ namespace Wino.Calendar.ViewModels
             base.OnCalendarEventAdded(calendarItem);
 
             // Test
-            var eventDays = DayRanges.SelectMany(a => a.CalendarDays).Where(b => b.Period.Start.Date == calendarItem.StartTime.Date);
+            //var eventDays = DayRanges.SelectMany(a => a.CalendarDays).Where(b => b.Period.Start.Date == calendarItem.StartTime.Date);
 
-            var beforeAllDay = new CalendarItem(calendarItem.StartTime.Date.AddHours(0), calendarItem.StartTime.Date.AddMinutes(30))
-            {
-                Title = "kj"
-            };
+            //var beforeAllDay = new CalendarItem(calendarItem.StartTime.Date.AddHours(0), calendarItem.StartTime.Date.AddMinutes(30))
+            //{
+            //    Title = "kj"
+            //};
 
-            var allday = new CalendarItem(calendarItem.StartTime.Date.AddHours(1), calendarItem.StartTime.Date.AddHours(10).AddMinutes(59))
-            {
-                Title = "All day"
-            };
+            //var allday = new CalendarItem(calendarItem.StartTime.Date.AddHours(1), calendarItem.StartTime.Date.AddHours(10).AddMinutes(59))
+            //{
+            //    Title = "All day"
+            //};
 
-            var test = new CalendarItem(calendarItem.StartTime.Date.AddHours(4), calendarItem.StartTime.Date.AddHours(4).AddMinutes(30))
-            {
-                Title = "test"
-            };
+            //var test = new CalendarItem(calendarItem.StartTime.Date.AddHours(4), calendarItem.StartTime.Date.AddHours(4).AddMinutes(30))
+            //{
+            //    Title = "test"
+            //};
 
-            var hour = new CalendarItem(calendarItem.StartTime.Date.AddHours(7), calendarItem.StartTime.Date.AddHours(8))
-            {
-                Title = "1 h"
-            };
+            //var hour = new CalendarItem(calendarItem.StartTime.Date.AddHours(7), calendarItem.StartTime.Date.AddHours(8))
+            //{
+            //    Title = "1 h"
+            //};
 
-            var hourandhalf = new CalendarItem(calendarItem.StartTime.Date.AddHours(7), calendarItem.StartTime.Date.AddHours(8).AddMinutes(30))
-            {
-                Title = "1.5 h"
-            };
-            var halfhour1 = new CalendarItem(calendarItem.StartTime.Date.AddHours(7), calendarItem.StartTime.Date.AddHours(7).AddMinutes(30))
-            {
-                Title = "30 min"
-            };
+            //var hourandhalf = new CalendarItem(calendarItem.StartTime.Date.AddHours(7), calendarItem.StartTime.Date.AddHours(8).AddMinutes(30))
+            //{
+            //    Title = "1.5 h"
+            //};
+            //var halfhour1 = new CalendarItem(calendarItem.StartTime.Date.AddHours(7), calendarItem.StartTime.Date.AddHours(7).AddMinutes(30))
+            //{
+            //    Title = "30 min"
+            //};
 
-            var halfhour2 = new CalendarItem(calendarItem.StartTime.Date.AddHours(7).AddMinutes(30), calendarItem.StartTime.Date.AddHours(8))
-            {
-                Title = "30 min"
-            };
-            var halfhour3 = new CalendarItem(calendarItem.StartTime.Date.AddHours(8), calendarItem.StartTime.Date.AddHours(8).AddMinutes(30))
-            {
-                Title = "30 min"
-            };
+            //var halfhour2 = new CalendarItem(calendarItem.StartTime.Date.AddHours(7).AddMinutes(30), calendarItem.StartTime.Date.AddHours(8))
+            //{
+            //    Title = "30 min"
+            //};
+            //var halfhour3 = new CalendarItem(calendarItem.StartTime.Date.AddHours(8), calendarItem.StartTime.Date.AddHours(8).AddMinutes(30))
+            //{
+            //    Title = "30 min"
+            //};
 
-            foreach (var day in eventDays)
-            {
-                await ExecuteUIThread(() =>
-                {
-                    day.Events.Add(beforeAllDay);
-                    day.Events.Add(allday);
-                    day.Events.Add(hourandhalf);
-                    day.Events.Add(hour);
-                    day.Events.Add(halfhour1);
-                    day.Events.Add(halfhour2);
-                    day.Events.Add(halfhour3);
-                    day.Events.Add(test);
-                });
-            }
+            //foreach (var day in eventDays)
+            //{
+            //    await ExecuteUIThread(() =>
+            //    {
+            //        day.Events.Add(beforeAllDay);
+            //        day.Events.Add(allday);
+            //        day.Events.Add(hourandhalf);
+            //        day.Events.Add(hour);
+            //        day.Events.Add(halfhour1);
+            //        day.Events.Add(halfhour2);
+            //        day.Events.Add(halfhour3);
+            //        day.Events.Add(test);
+            //    });
+            //}
 
-            return;
+            //return;
         }
     }
 }
diff --git a/Wino.Calendar/App.xaml.cs b/Wino.Calendar/App.xaml.cs
index 510fe951..90faee93 100644
--- a/Wino.Calendar/App.xaml.cs
+++ b/Wino.Calendar/App.xaml.cs
@@ -12,7 +12,11 @@ using Wino.Activation;
 using Wino.Calendar.Activation;
 using Wino.Calendar.Services;
 using Wino.Calendar.ViewModels;
+using Wino.Core.Domain;
+using Wino.Core.Domain.Enums;
+using Wino.Core.Domain.Exceptions;
 using Wino.Core.Domain.Interfaces;
+using Wino.Core.Domain.Models.Synchronization;
 using Wino.Core.UWP;
 using Wino.Messaging.Client.Connection;
 using Wino.Messaging.Server;
@@ -20,7 +24,7 @@ using Wino.Services;
 
 namespace Wino.Calendar
 {
-    public sealed partial class App : WinoApplication, IRecipient<NewSynchronizationRequested>
+    public sealed partial class App : WinoApplication, IRecipient<NewCalendarSynchronizationRequested>
     {
         public override string AppCenterKey => "dfdad6ab-95f9-44cc-9112-45ec6730c49e";
 
@@ -101,13 +105,6 @@ namespace Wino.Calendar
         protected override ActivationHandler<IActivatedEventArgs> GetDefaultActivationHandler()
             => new DefaultActivationHandler();
 
-        public void Receive(NewSynchronizationRequested message)
-        {
-
-        }
-
-
-
         protected override void OnBackgroundActivated(BackgroundActivatedEventArgs args)
         {
             base.OnBackgroundActivated(args);
@@ -142,5 +139,20 @@ namespace Wino.Calendar
 
             AppServiceConnectionManager.Connection = null;
         }
+
+        public async void Receive(NewCalendarSynchronizationRequested message)
+        {
+            try
+            {
+                var synchronizationResultResponse = await AppServiceConnectionManager.GetResponseAsync<CalendarSynchronizationResult, NewCalendarSynchronizationRequested>(message);
+                synchronizationResultResponse.ThrowIfFailed();
+            }
+            catch (WinoServerException serverException)
+            {
+                var dialogService = Services.GetService<ICalendarDialogService>();
+
+                dialogService.InfoBarMessage(Translator.Info_SyncFailedTitle, serverException.Message, InfoBarMessageType.Error);
+            }
+        }
     }
 }
diff --git a/Wino.Calendar/Controls/WinoCalendarPanel.cs b/Wino.Calendar/Controls/WinoCalendarPanel.cs
index 78144342..64dff365 100644
--- a/Wino.Calendar/Controls/WinoCalendarPanel.cs
+++ b/Wino.Calendar/Controls/WinoCalendarPanel.cs
@@ -129,7 +129,9 @@ namespace Wino.Calendar.Controls
 
                 var childMeasurement = _measurements[child.Item.Id];
 
-                double childHeight = Math.Max(0, GetChildHeight(child.Item.StartTime, child.Item.EndTime));
+                // TODO Math.Max(0, GetChildHeight(child.Item.StartTime, child.Item.EndTime));
+                // Recurring events may not have an end time. We need to calculate the height based on the start time and duration.
+                double childHeight = 50;
                 double childWidth = Math.Max(0, GetChildWidth(childMeasurement, finalSize.Width));
                 double childTop = Math.Max(0, GetChildTopMargin(child.Item.StartTime, availableHeight));
                 double childLeft = Math.Max(0, GetChildLeftMargin(childMeasurement, availableWidth));
diff --git a/Wino.Calendar/Styles/CalendarRenderStyles.xaml b/Wino.Calendar/Styles/CalendarRenderStyles.xaml
index 5bedf96b..6387c5b4 100644
--- a/Wino.Calendar/Styles/CalendarRenderStyles.xaml
+++ b/Wino.Calendar/Styles/CalendarRenderStyles.xaml
@@ -19,7 +19,7 @@
             <SolidColorBrush x:Key="CalendarFieldSelectedBackgroundBrush">#121212</SolidColorBrush>
 
             <SolidColorBrush x:Key="WinoCalendarViewBorderBrush">#3d3d3d</SolidColorBrush>
-            <SolidColorBrush x:Key="WinoCalendarViewVisibleDayBackgroundBrush">#30336b</SolidColorBrush>
+            <SolidColorBrush x:Key="WinoCalendarViewVisibleDayBackgroundBrush">#4b4b4b</SolidColorBrush>
 
         </ResourceDictionary>
     </ResourceDictionary.ThemeDictionaries>
diff --git a/Wino.Calendar/Views/AppShell.xaml b/Wino.Calendar/Views/AppShell.xaml
index 3f1ec9c0..05bb1822 100644
--- a/Wino.Calendar/Views/AppShell.xaml
+++ b/Wino.Calendar/Views/AppShell.xaml
@@ -9,6 +9,8 @@
     xmlns:coreControls="using:Wino.Core.UWP.Controls"
     xmlns:coreSelectors="using:Wino.Core.UWP.Selectors"
     xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:domain="using:Wino.Core.Domain"
+    xmlns:helpers="using:Wino.Helpers"
     xmlns:local="using:Wino.Calendar.Views"
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
     xmlns:muxc="using:Microsoft.UI.Xaml.Controls"
@@ -57,8 +59,8 @@
             ConnectionStatus="{x:Bind ViewModel.ActiveConnectionStatus, Mode=OneWay}"
             CoreWindowText="Wino Calendar"
             IsBackButtonVisible="{x:Bind ViewModel.StatePersistenceService.IsBackButtonVisible, Mode=OneWay}"
-            IsNavigationPaneOpen="{x:Bind MainNavigationView.IsPaneOpen, Mode=TwoWay}"
-            NavigationViewDisplayMode="{x:Bind MainNavigationView.DisplayMode, Mode=OneWay}"
+            IsNavigationPaneOpen="{x:Bind MainSplitView.IsPaneOpen, Mode=TwoWay}"
+            NavigationViewDisplayMode="{x:Bind helpers:XamlHelpers.NavigationViewDisplayModeConverter(MainSplitView.DisplayMode), Mode=OneWay}"
             OpenPaneLength="{x:Bind ViewModel.StatePersistenceService.OpenPaneLength, Mode=OneWay}"
             ReconnectCommand="{x:Bind ViewModel.ReconnectServerCommand}"
             ShrinkShellContentOnExpansion="False"
@@ -149,39 +151,86 @@
             Background="{ThemeResource WinoApplicationBackgroundColor}"
             IsHitTestVisible="False" />
 
-        <muxc:NavigationView
-            x:Name="MainNavigationView"
+        <SplitView
+            x:Name="MainSplitView"
             Grid.Row="1"
             Grid.ColumnSpan="3"
-            HorizontalContentAlignment="Stretch"
-            VerticalContentAlignment="Stretch"
-            AlwaysShowHeader="True"
-            FooterMenuItemsSource="{x:Bind ViewModel.FooterItems, Mode=OneWay}"
-            IsBackButtonVisible="Collapsed"
-            IsPaneOpen="{x:Bind ViewModel.PreferencesService.IsNavigationPaneOpened, Mode=TwoWay}"
-            IsPaneToggleButtonVisible="False"
-            IsSettingsVisible="False"
-            IsTabStop="True"
-            IsTitleBarAutoPaddingEnabled="False"
-            MenuItemTemplateSelector="{StaticResource NavigationMenuTemplateSelector}"
-            MenuItemsSource="{x:Bind ViewModel.MenuItems, Mode=OneWay}"
-            OpenPaneLength="{x:Bind ViewModel.StatePersistenceService.OpenPaneLength, Mode=TwoWay}"
-            SelectedItem="{x:Bind ViewModel.SelectedMenuItem, Mode=TwoWay}">
-            <muxc:NavigationView.ContentTransitions>
-                <TransitionCollection>
-                    <AddDeleteThemeTransition />
-                </TransitionCollection>
-            </muxc:NavigationView.ContentTransitions>
+            Background="Transparent"
+            DisplayMode="Inline"
+            IsPaneOpen="True"
+            PaneBackground="Transparent">
+            <SplitView.Pane>
+                <Grid Padding="0,30,0,6">
+                    <Grid.RowDefinitions>
+                        <RowDefinition Height="Auto" />
+                        <RowDefinition Height="*" />
+                        <RowDefinition Height="Auto" />
+                    </Grid.RowDefinitions>
 
-            <muxc:NavigationView.PaneHeader>
-                <calendarControls:WinoCalendarView
-                    x:Name="CalendarView"
-                    Margin="2,0"
-                    HorizontalAlignment="Center"
-                    DateClickedCommand="{x:Bind ViewModel.DateClickedCommand}"
-                    HighlightedDateRange="{x:Bind ViewModel.HighlightedDateRange, Mode=OneWay}" />
-            </muxc:NavigationView.PaneHeader>
-            <muxc:NavigationView.Content>
+                    <calendarControls:WinoCalendarView
+                        x:Name="CalendarView"
+                        HorizontalAlignment="Center"
+                        DateClickedCommand="{x:Bind ViewModel.DateClickedCommand}"
+                        HighlightedDateRange="{x:Bind ViewModel.HighlightedDateRange, Mode=OneWay}" />
+
+                    <ScrollViewer
+                        Grid.Row="1"
+                        HorizontalScrollMode="Disabled"
+                        VerticalScrollBarVisibility="Hidden">
+                        <Grid>
+                            <Button
+                                HorizontalAlignment="Stretch"
+                                VerticalAlignment="Bottom"
+                                Command="{x:Bind ViewModel.SyncCommand}"
+                                Content="Test Sync" />
+                        </Grid>
+                    </ScrollViewer>
+
+                    <ListView
+                        Grid.Row="2"
+                        ItemTemplateSelector="{StaticResource NavigationMenuTemplateSelector}"
+                        SelectedIndex="{x:Bind ViewModel.SelectedMenuItemIndex, Mode=TwoWay}">
+                        <ListView.Items>
+                            <ListViewItem>
+                                <StackPanel Orientation="Horizontal" Spacing="12">
+                                    <PathIcon
+                                        HorizontalAlignment="Center"
+                                        VerticalAlignment="Center"
+                                        Data="F1 M 2.5 3.75 L 2.5 3.671875 C 2.5 3.164062 2.600911 2.687176 2.802734 2.241211 C 3.004557 1.795248 3.277995 1.40625 3.623047 1.074219 C 3.968099 0.742188 4.366862 0.480145 4.819336 0.288086 C 5.27181 0.096029 5.748698 0 6.25 0 C 6.770833 0 7.259114 0.097656 7.714844 0.292969 C 8.170572 0.488281 8.567708 0.755209 8.90625 1.09375 C 9.244791 1.432293 9.511719 1.829428 9.707031 2.285156 C 9.902344 2.740887 10 3.229168 10 3.75 C 10 4.270834 9.902344 4.759115 9.707031 5.214844 C 9.511719 5.670573 9.244791 6.067709 8.90625 6.40625 C 8.567708 6.744792 8.170572 7.011719 7.714844 7.207031 C 7.259114 7.402344 6.770833 7.5 6.25 7.5 C 5.729167 7.5 5.240885 7.402344 4.785156 7.207031 C 4.329427 7.011719 3.932292 6.744792 3.59375 6.40625 C 3.255208 6.067709 2.988281 5.670573 2.792969 5.214844 C 2.597656 4.759115 2.5 4.270834 2.5 3.75 Z M 8.75 3.75 L 8.75 3.701172 C 8.75 3.362631 8.681641 3.045248 8.544922 2.749023 C 8.408203 2.452801 8.225911 2.194012 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3.24707 14.285482 3.580729 14.462891 3.925781 14.599609 C 3.854167 14.807943 3.806966 15.014648 3.78418 15.219727 C 3.761393 15.424805 3.75 15.638021 3.75 15.859375 C 3.261719 15.703125 2.791341 15.478516 2.338867 15.185547 C 1.886393 14.892578 1.48763 14.549154 1.142578 14.155273 C 0.797526 13.761394 0.520833 13.323568 0.3125 12.841797 C 0.104167 12.360026 0 11.848959 0 11.308594 L 0 10.625 C 0 10.371094 0.048828 10.130209 0.146484 9.902344 C 0.244141 9.674479 0.379232 9.474284 0.551758 9.301758 C 0.724284 9.129232 0.924479 8.994141 1.152344 8.896484 C 1.380208 8.798828 1.621094 8.75 1.875 8.75 Z M 10.107422 11.25 C 10.263672 11.25 10.411783 11.212565 10.551758 11.137695 C 10.691731 11.062826 10.813802 10.966797 10.917969 10.849609 C 11.022135 10.732422 11.103516 10.598959 11.162109 10.449219 C 11.220703 10.299479 11.25 10.14974 11.25 10 C 11.25 9.830729 11.217447 9.669597 11.152344 9.516602 C 11.087239 9.363607 10.997721 9.230144 10.883789 9.116211 C 10.769856 9.002279 10.636393 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18.378906 10 18.619791 10.048828 18.847656 10.146484 C 19.07552 10.244141 19.275715 10.379232 19.448242 10.551758 C 19.620768 10.724284 19.755859 10.924479 19.853516 11.152344 C 19.951172 11.380209 20 11.621094 20 11.875 C 20 12.460938 19.907227 12.991537 19.72168 13.466797 C 19.536133 13.942058 19.277344 14.360352 18.945312 14.72168 C 18.613281 15.083008 18.216145 15.382487 17.753906 15.620117 C 17.291666 15.857748 16.783854 16.0319 16.230469 16.142578 C 16.236979 16.051432 16.241861 15.96517 16.245117 15.883789 C 16.248371 15.802409 16.25 15.716146 16.25 15.625 Z M 5 15.625 C 5 15.364584 5.048828 15.120443 5.146484 14.892578 C 5.244141 14.664714 5.377604 14.466146 5.546875 14.296875 C 5.716146 14.127604 5.914713 13.994141 6.142578 13.896484 C 6.370442 13.798828 6.614583 13.75 6.875 13.75 L 13.125 13.75 C 13.385416 13.75 13.629557 13.798828 13.857422 13.896484 C 14.085286 13.994141 14.283854 14.127604 14.453125 14.296875 C 14.622395 14.466146 14.755858 14.664714 14.853516 14.892578 C 14.951171 15.120443 14.999999 15.364584 15 15.625 C 14.999999 16.341146 14.86328 16.971029 14.589844 17.514648 C 14.316405 18.058268 13.950194 18.513998 13.491211 18.881836 C 13.032226 19.249674 12.501627 19.527994 11.899414 19.716797 C 11.2972 19.9056 10.664062 20 10 20 C 9.335938 20 8.701172 19.907227 8.095703 19.72168 C 7.490234 19.536133 6.958008 19.259439 6.499023 18.891602 C 6.040039 18.523764 5.675456 18.066406 5.405273 17.519531 C 5.135091 16.972656 5 16.341146 5 15.625 Z M 13.75 15.625 C 13.75 15.455729 13.68815 15.309245 13.564453 15.185547 C 13.440755 15.06185 13.294271 15 13.125 15 L 6.875 15 C 6.705729 15 6.559244 15.06185 6.435547 15.185547 C 6.311849 15.309245 6.25 15.455729 6.25 15.625 C 6.25 16.165365 6.354167 16.632486 6.5625 17.026367 C 6.770833 17.420248 7.049153 17.744141 7.397461 17.998047 C 7.745768 18.251953 8.144531 18.440756 8.59375 18.564453 C 9.042969 18.68815 9.511719 18.75 10 18.75 C 10.488281 18.75 10.957031 18.68815 11.40625 18.564453 C 11.855469 18.440756 12.254231 18.251953 12.602539 17.998047 C 12.950846 17.744141 13.229166 17.420248 13.4375 17.026367 C 13.645833 16.632486 13.75 16.165365 13.75 15.625 Z " />
+                            </AppBarButton.Icon>
+                        </AppBarButton>
+                        <AppBarButton Icon="Setting" Label="Settings" />
+                    </CommandBar>-->
+                </Grid>
+            </SplitView.Pane>
+            <SplitView.Content>
                 <Grid>
                     <Grid.ColumnDefinitions>
                         <ColumnDefinition Width="*" />
@@ -210,8 +259,67 @@
                         IsClosable="False"
                         IsOpen="False" />
                 </Grid>
+            </SplitView.Content>
+        </SplitView>
+
+        <!--<muxc:NavigationView
+            x:Name="MainNavigationView"
+            Grid.Row="1"
+            Grid.ColumnSpan="3"
+            HorizontalContentAlignment="Stretch"
+            VerticalContentAlignment="Stretch"
+            AlwaysShowHeader="True"
+            FooterMenuItemsSource="{x:Bind ViewModel.FooterItems, Mode=OneWay}"
+            IsBackButtonVisible="Collapsed"
+            IsPaneOpen="{x:Bind ViewModel.PreferencesService.IsNavigationPaneOpened, Mode=TwoWay}"
+            IsPaneToggleButtonVisible="False"
+            IsSettingsVisible="False"
+            IsTabStop="True"
+            IsTitleBarAutoPaddingEnabled="False"
+            MenuItemTemplateSelector="{StaticResource NavigationMenuTemplateSelector}"
+            MenuItemsSource="{x:Bind ViewModel.MenuItems, Mode=OneWay}"
+            OpenPaneLength="{x:Bind ViewModel.StatePersistenceService.OpenPaneLength, Mode=TwoWay}"
+            SelectedItem="{x:Bind ViewModel.SelectedMenuItem, Mode=TwoWay}"
+            Visibility="Collapsed">
+            <muxc:NavigationView.ContentTransitions>
+                <TransitionCollection>
+                    <AddDeleteThemeTransition />
+                </TransitionCollection>
+            </muxc:NavigationView.ContentTransitions>
+
+            <muxc:NavigationView.PaneHeader>
+                <Grid>
+                    <Grid.RowDefinitions>
+                        <RowDefinition Height="Auto" />
+                        <RowDefinition Height="*" />
+                    </Grid.RowDefinitions>
+                    <calendarControls:WinoCalendarView
+                        x:Name="CalendarView"
+                        HorizontalAlignment="Center"
+                        DateClickedCommand="{x:Bind ViewModel.DateClickedCommand}"
+                        HighlightedDateRange="{x:Bind ViewModel.HighlightedDateRange, Mode=OneWay}" />
+
+                    <ScrollViewer
+                        Grid.Row="1"
+                        HorizontalScrollMode="Disabled"
+                        VerticalScrollBarVisibility="Hidden">
+                        <StackPanel>
+                            <Button
+                                Margin="0,24"
+                                VerticalAlignment="Bottom"
+                                Command="{x:Bind ViewModel.SyncCommand}"
+                                Content="Sync" />
+
+
+                        </StackPanel>
+                    </ScrollViewer>
+                </Grid>
+            </muxc:NavigationView.PaneHeader>
+            <muxc:NavigationView.Content>
+
             </muxc:NavigationView.Content>
-        </muxc:NavigationView>
+        </muxc:NavigationView>-->
+
         <VisualStateManager.VisualStateGroups>
             <VisualStateGroup x:Name="LowResolutionStates">
                 <VisualState x:Name="BigScreen">
@@ -249,3 +357,4 @@
         </VisualStateManager.VisualStateGroups>
     </Grid>
 </abstract:AppShellAbstract>
+
diff --git a/Wino.Calendar/Views/CalendarPage.xaml.cs b/Wino.Calendar/Views/CalendarPage.xaml.cs
index 2ab04506..dc833f44 100644
--- a/Wino.Calendar/Views/CalendarPage.xaml.cs
+++ b/Wino.Calendar/Views/CalendarPage.xaml.cs
@@ -4,7 +4,6 @@ using Microsoft.UI.Xaml.Controls;
 using Windows.UI.Xaml.Controls;
 using Wino.Calendar.Args;
 using Wino.Calendar.Views.Abstract;
-using Wino.Core.Domain.Models.Calendar;
 using Wino.Messaging.Client.Calendar;
 
 namespace Wino.Calendar.Views
@@ -30,24 +29,15 @@ namespace Wino.Calendar.Views
         {
             selectedDateTime = e.ClickedDate;
 
+            // TODO: Popup is not positioned well on daily view.
             TeachingTipPositionerGrid.Width = e.CellSize.Width;
             TeachingTipPositionerGrid.Height = e.CellSize.Height;
 
             Canvas.SetLeft(TeachingTipPositionerGrid, e.PositionerPoint.X);
             Canvas.SetTop(TeachingTipPositionerGrid, e.PositionerPoint.Y);
 
-            WeakReferenceMessenger.Default.Send(new CalendarEventAdded(new CalendarItem(selectedDateTime.Value, default)));
-
-            //var t = new Flyout()
-            //{
-            //    Content = new TextBlock() { Text = "Create event" }
-            //};
-
-            //t.ShowAt(TeachingTipPositionerGrid, new FlyoutShowOptions()
-            //{
-            //    ShowMode = FlyoutShowMode.Transient,
-            //    Placement = FlyoutPlacementMode.Right
-            //});
+            // TODO: End time can be from settings.
+            // WeakReferenceMessenger.Default.Send(new CalendarEventAdded(new CalendarItem(selectedDateTime.Value, selectedDateTime.Value.AddMinutes(30))));
 
             NewEventTip.IsOpen = true;
         }
@@ -71,7 +61,7 @@ namespace Wino.Calendar.Views
             var eventEndDate = selectedDateTime.Value.Add(EventTimePicker.Time);
 
             // Create the event.
-            WeakReferenceMessenger.Default.Send(new CalendarEventAdded(new CalendarItem(selectedDateTime.Value, eventEndDate)));
+            // WeakReferenceMessenger.Default.Send(new CalendarEventAdded(new CalendarItem(selectedDateTime.Value, eventEndDate)));
         }
     }
 }
diff --git a/Wino.Core.Domain/Entities/Calendar/AccountCalendar.cs b/Wino.Core.Domain/Entities/Calendar/AccountCalendar.cs
index 7752562b..4e5f9c8f 100644
--- a/Wino.Core.Domain/Entities/Calendar/AccountCalendar.cs
+++ b/Wino.Core.Domain/Entities/Calendar/AccountCalendar.cs
@@ -7,10 +7,12 @@ namespace Wino.Core.Domain.Entities.Calendar
     {
         [PrimaryKey]
         public Guid Id { get; set; }
-
+        public string RemoteCalendarId { get; set; }
+        public string SynchronizationDeltaToken { get; set; }
         public Guid AccountId { get; set; }
         public string Name { get; set; }
         public string ColorHex { get; set; }
-        public string TimeZoneId { get; set; }
+        public string TimeZone { get; set; }
+        public bool IsPrimary { get; set; }
     }
 }
diff --git a/Wino.Core.Domain/Entities/Calendar/Attendee.cs b/Wino.Core.Domain/Entities/Calendar/Attendee.cs
deleted file mode 100644
index 55b7bb4f..00000000
--- a/Wino.Core.Domain/Entities/Calendar/Attendee.cs
+++ /dev/null
@@ -1,16 +0,0 @@
-using System;
-using SQLite;
-using Wino.Core.Domain.Enums;
-
-namespace Wino.Core.Domain.Entities.Calendar
-{
-    public class Attendee
-    {
-        [PrimaryKey]
-        public Guid Id { get; set; }
-        public Guid EventId { get; set; }
-        public Guid ContactId { get; set; }
-        public AttendeeStatus Status { get; set; }
-        public bool IsOrganizer { get; set; }
-    }
-}
diff --git a/Wino.Core.Domain/Entities/Calendar/CalendarEventAttendee.cs b/Wino.Core.Domain/Entities/Calendar/CalendarEventAttendee.cs
new file mode 100644
index 00000000..5fd07479
--- /dev/null
+++ b/Wino.Core.Domain/Entities/Calendar/CalendarEventAttendee.cs
@@ -0,0 +1,20 @@
+using System;
+using SQLite;
+using Wino.Core.Domain.Enums;
+
+namespace Wino.Core.Domain.Entities.Calendar
+{
+    // TODO: Connect to Contact store with Wino People.
+    public class CalendarEventAttendee
+    {
+        [PrimaryKey]
+        public Guid Id { get; set; }
+        public Guid CalendarItemId { get; set; }
+        public string Name { get; set; }
+        public string Email { get; set; }
+        public AttendeeStatus AttendenceStatus { get; set; }
+        public bool IsOrganizer { get; set; }
+        public bool IsOptionalAttendee { get; set; }
+        public string Comment { get; set; }
+    }
+}
diff --git a/Wino.Core.Domain/Entities/Calendar/CalendarItem.cs b/Wino.Core.Domain/Entities/Calendar/CalendarItem.cs
index d4c49b4f..66c23f9e 100644
--- a/Wino.Core.Domain/Entities/Calendar/CalendarItem.cs
+++ b/Wino.Core.Domain/Entities/Calendar/CalendarItem.cs
@@ -14,9 +14,8 @@ namespace Wino.Core.Domain.Entities.Calendar
         public string Description { get; set; }
         public string Location { get; set; }
         public DateTimeOffset StartTime { get; set; }
-        public DateTimeOffset EndTime { get; set; }
-        public bool IsAllDay { get; set; }
-        public Guid? RecurrenceRuleId { get; set; }
+        public int DurationInMinutes { get; set; }
+        public string Recurrence { get; set; }
         public CalendarItemStatus Status { get; set; }
         public CalendarItemVisibility Visibility { get; set; }
         public DateTimeOffset CreatedAt { get; set; }
@@ -24,6 +23,6 @@ namespace Wino.Core.Domain.Entities.Calendar
         public Guid CalendarId { get; set; }
 
         [Ignore]
-        public TimeRange Period => new TimeRange(StartTime.Date, EndTime.Date);
+        public TimeRange Period => new TimeRange(StartTime.Date, StartTime.Date.AddMinutes(DurationInMinutes));
     }
 }
diff --git a/Wino.Core.Domain/Entities/Calendar/RecurrenceRule.cs b/Wino.Core.Domain/Entities/Calendar/RecurrenceRule.cs
deleted file mode 100644
index 53ed4e5d..00000000
--- a/Wino.Core.Domain/Entities/Calendar/RecurrenceRule.cs
+++ /dev/null
@@ -1,20 +0,0 @@
-using System;
-using SQLite;
-using Wino.Core.Domain.Enums;
-
-namespace Wino.Core.Domain.Entities.Calendar
-{
-    public class RecurrenceRule
-    {
-        [PrimaryKey]
-        public Guid Id { get; set; }
-
-        public Guid CalendarItemId { get; set; }
-        public CalendarItemRecurrenceFrequency Frequency { get; set; }
-        public int Interval { get; set; }
-        public string DaysOfWeek { get; set; }
-        public DateTimeOffset StartDate { get; set; }
-        public DateTimeOffset EndDate { get; set; }
-        public int Occurrences { get; set; }
-    }
-}
diff --git a/Wino.Core.Domain/Entities/Shared/MailAccount.cs b/Wino.Core.Domain/Entities/Shared/MailAccount.cs
index 014bb1c9..12ae15a6 100644
--- a/Wino.Core.Domain/Entities/Shared/MailAccount.cs
+++ b/Wino.Core.Domain/Entities/Shared/MailAccount.cs
@@ -34,7 +34,7 @@ namespace Wino.Core.Domain.Entities.Shared
         public MailProviderType ProviderType { get; set; }
 
         /// <summary>
-        /// For tracking change delta.
+        /// For tracking mail change delta.
         /// Gmail  : historyId
         /// Outlook: deltaToken
         /// </summary>
diff --git a/Wino.Core.Domain/Enums/AttendeeStatus.cs b/Wino.Core.Domain/Enums/AttendeeStatus.cs
index 85e6992b..57203f30 100644
--- a/Wino.Core.Domain/Enums/AttendeeStatus.cs
+++ b/Wino.Core.Domain/Enums/AttendeeStatus.cs
@@ -2,6 +2,7 @@
 {
     public enum AttendeeStatus
     {
+        NeedsAction,
         Accepted,
         Tentative,
         Declined
diff --git a/Wino.Core.Domain/Enums/CalendarItemVisibility.cs b/Wino.Core.Domain/Enums/CalendarItemVisibility.cs
index 4f8b0fae..5fc3143e 100644
--- a/Wino.Core.Domain/Enums/CalendarItemVisibility.cs
+++ b/Wino.Core.Domain/Enums/CalendarItemVisibility.cs
@@ -2,7 +2,9 @@
 {
     public enum CalendarItemVisibility
     {
+        Default,
         Public,
-        Private
+        Private,
+        Confidential
     }
 }
diff --git a/Wino.Core.Domain/Enums/CalendarSynchronizationType.cs b/Wino.Core.Domain/Enums/CalendarSynchronizationType.cs
index 0d16fe97..9b19472b 100644
--- a/Wino.Core.Domain/Enums/CalendarSynchronizationType.cs
+++ b/Wino.Core.Domain/Enums/CalendarSynchronizationType.cs
@@ -2,8 +2,10 @@
 {
     public enum CalendarSynchronizationType
     {
-        AllCalendars, // Sync all calendars.
-        SingleCalendar, // Sync only one calendar.
+        ExecuteRequests, // Execute all requests in the queue.
+        CalendarMetadata, // Sync calendar metadata.
+        CalendarEvents, // Sync all events for all calendars.
+        SingleCalendar, // Sync events for only specified calendars.
         UpdateProfile // Update profile information only.
     }
 }
diff --git a/Wino.Core.Domain/Interfaces/ICalendarItem.cs b/Wino.Core.Domain/Interfaces/ICalendarItem.cs
index 8c36d74d..99d02e88 100644
--- a/Wino.Core.Domain/Interfaces/ICalendarItem.cs
+++ b/Wino.Core.Domain/Interfaces/ICalendarItem.cs
@@ -8,7 +8,7 @@ namespace Wino.Core.Domain.Interfaces
         string Title { get; }
         Guid Id { get; }
         DateTimeOffset StartTime { get; }
-        DateTimeOffset EndTime { get; }
+        int DurationInMinutes { get; }
         TimeRange Period { get; }
     }
 }
diff --git a/Wino.Core.Domain/Interfaces/ICalendarService.cs b/Wino.Core.Domain/Interfaces/ICalendarService.cs
new file mode 100644
index 00000000..d1ddfc3c
--- /dev/null
+++ b/Wino.Core.Domain/Interfaces/ICalendarService.cs
@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using Wino.Core.Domain.Entities.Calendar;
+
+namespace Wino.Core.Domain.Interfaces
+{
+    public interface ICalendarService
+    {
+        Task<List<AccountCalendar>> GetAccountCalendarsAsync(Guid accountId);
+        Task DeleteCalendarItemAsync(Guid calendarItemId);
+
+        Task DeleteAccountCalendarAsync(AccountCalendar accountCalendar);
+        Task InsertAccountCalendarAsync(AccountCalendar accountCalendar);
+        Task UpdateAccountCalendarAsync(AccountCalendar accountCalendar);
+        Task CreateNewCalendarItemAsync(CalendarItem calendarItem, List<CalendarEventAttendee> attendees);
+    }
+}
diff --git a/Wino.Core.Domain/Interfaces/IContactService.cs b/Wino.Core.Domain/Interfaces/IContactService.cs
index ddba3b60..e9e1df7d 100644
--- a/Wino.Core.Domain/Interfaces/IContactService.cs
+++ b/Wino.Core.Domain/Interfaces/IContactService.cs
@@ -10,5 +10,6 @@ namespace Wino.Core.Domain.Interfaces
         Task<List<AccountContact>> GetAddressInformationAsync(string queryText);
         Task<AccountContact> GetAddressInformationByAddressAsync(string address);
         Task SaveAddressInformationAsync(MimeMessage message);
+        Task<AccountContact> CreateNewContactAsync(string address, string displayName);
     }
 }
diff --git a/Wino.Core.Domain/Interfaces/IWinoSynchronizerBase.cs b/Wino.Core.Domain/Interfaces/IWinoSynchronizerBase.cs
index 4a424998..7864414a 100644
--- a/Wino.Core.Domain/Interfaces/IWinoSynchronizerBase.cs
+++ b/Wino.Core.Domain/Interfaces/IWinoSynchronizerBase.cs
@@ -19,6 +19,8 @@ namespace Wino.Core.Domain.Interfaces
         /// <returns>Result summary of synchronization.</returns>
         Task<MailSynchronizationResult> SynchronizeMailsAsync(MailSynchronizationOptions options, CancellationToken cancellationToken = default);
 
+        Task<CalendarSynchronizationResult> SynchronizeCalendarEventsAsync(CalendarSynchronizationOptions options, CancellationToken cancellationToken = default);
+
         /// <summary>
         /// Downloads a single MIME message from the server and saves it to disk.
         /// </summary>
diff --git a/Wino.Core.Domain/Models/Calendar/CalendarItem.cs b/Wino.Core.Domain/Models/Calendar/CalendarItem.cs
deleted file mode 100644
index 437f4c47..00000000
--- a/Wino.Core.Domain/Models/Calendar/CalendarItem.cs
+++ /dev/null
@@ -1,24 +0,0 @@
-using System;
-using Itenso.TimePeriod;
-using Wino.Core.Domain.Interfaces;
-
-namespace Wino.Core.Domain.Models.Calendar
-{
-    public class CalendarItem : ICalendarItem
-    {
-        public string Title { get; set; }
-        public CalendarItem(DateTime startTime, DateTime endTime)
-        {
-            StartTime = startTime;
-            EndTime = endTime;
-            Period = new TimeRange(startTime, endTime);
-        }
-
-        public DateTimeOffset StartTime { get; }
-        public DateTimeOffset EndTime { get; }
-
-        public Guid Id { get; } = Guid.NewGuid();
-
-        public TimeRange Period { get; }
-    }
-}
diff --git a/Wino.Core.UWP/Helpers/XamlHelpers.cs b/Wino.Core.UWP/Helpers/XamlHelpers.cs
index 5b882f99..c6a1e4a4 100644
--- a/Wino.Core.UWP/Helpers/XamlHelpers.cs
+++ b/Wino.Core.UWP/Helpers/XamlHelpers.cs
@@ -19,6 +19,7 @@ namespace Wino.Helpers
     {
         private const string TwentyFourHourTimeFormat = "HH:mm";
         private const string TwelveHourTimeFormat = "hh:mm tt";
+
         #region Converters
 
         public static Visibility ReverseBoolToVisibilityConverter(bool value) => value ? Visibility.Collapsed : Visibility.Visible;
@@ -40,6 +41,19 @@ namespace Wino.Helpers
                 _ => InfoBarSeverity.Informational,
             };
         }
+
+        public static Microsoft.UI.Xaml.Controls.NavigationViewDisplayMode NavigationViewDisplayModeConverter(SplitViewDisplayMode splitViewDisplayMode)
+        {
+            return splitViewDisplayMode switch
+            {
+                SplitViewDisplayMode.CompactOverlay => Microsoft.UI.Xaml.Controls.NavigationViewDisplayMode.Compact,
+                SplitViewDisplayMode.CompactInline => Microsoft.UI.Xaml.Controls.NavigationViewDisplayMode.Minimal,
+                SplitViewDisplayMode.Overlay => Microsoft.UI.Xaml.Controls.NavigationViewDisplayMode.Expanded,
+                SplitViewDisplayMode.Inline => Microsoft.UI.Xaml.Controls.NavigationViewDisplayMode.Expanded,
+                _ => Microsoft.UI.Xaml.Controls.NavigationViewDisplayMode.Minimal,
+            };
+        }
+
         public static SolidColorBrush GetSolidColorBrushFromHex(string colorHex) => string.IsNullOrEmpty(colorHex) ? new SolidColorBrush(Colors.Transparent) : new SolidColorBrush(colorHex.ToColor());
         public static Visibility IsSelectionModeMultiple(ListViewSelectionMode mode) => mode == ListViewSelectionMode.Multiple ? Visibility.Visible : Visibility.Collapsed;
         public static FontWeight GetFontWeightBySyncState(bool isSyncing) => isSyncing ? FontWeights.SemiBold : FontWeights.Normal;
diff --git a/Wino.Core/Extensions/GoogleIntegratorExtensions.cs b/Wino.Core/Extensions/GoogleIntegratorExtensions.cs
index 8ae36947..9ceb1c26 100644
--- a/Wino.Core/Extensions/GoogleIntegratorExtensions.cs
+++ b/Wino.Core/Extensions/GoogleIntegratorExtensions.cs
@@ -2,8 +2,10 @@
 using System.Collections.Generic;
 using System.Linq;
 using System.Web;
+using Google.Apis.Calendar.v3.Data;
 using Google.Apis.Gmail.v1.Data;
 using MimeKit;
+using Wino.Core.Domain.Entities.Calendar;
 using Wino.Core.Domain.Entities.Mail;
 using Wino.Core.Domain.Enums;
 using Wino.Services;
@@ -13,10 +15,6 @@ namespace Wino.Core.Extensions
 {
     public static class GoogleIntegratorExtensions
     {
-
-
-
-
         private static string GetNormalizedLabelName(string labelName)
         {
             // 1. Remove CATEGORY_ prefix.
@@ -168,5 +166,119 @@ namespace Wino.Core.Extensions
                 IsVerified = a.VerificationStatus == "accepted" || a.IsDefault.GetValueOrDefault(),
             }).ToList();
         }
+
+        public static AccountCalendar AsCalendar(this CalendarListEntry calendarListEntry, Guid accountId)
+        {
+            return new AccountCalendar()
+            {
+                RemoteCalendarId = calendarListEntry.Id,
+                AccountId = accountId,
+                Name = calendarListEntry.Summary,
+                Id = Guid.NewGuid(),
+                TimeZone = calendarListEntry.TimeZone,
+                IsPrimary = calendarListEntry.Primary.GetValueOrDefault(),
+            };
+        }
+
+        /// <summary>
+        /// Extracts the start DateTimeOffset of a Google Calendar Event.
+        /// Handles different date/time representations (date-only, date-time, recurring events).
+        /// Uses the DateTimeDateTimeOffset property for optimal performance and accuracy.
+        /// </summary>
+        /// <param name="calendarEvent">The Google Calendar Event object.</param>
+        /// <returns>The start DateTimeOffset of the event, or null if it cannot be determined.</returns>
+        public static DateTimeOffset? GetEventStartDateTimeOffset(this Event calendarEvent)
+        {
+            if (calendarEvent == null)
+            {
+                return null;
+            }
+
+            if (calendarEvent.Start != null)
+            {
+                if (calendarEvent.Start.DateTimeDateTimeOffset != null)
+                {
+                    return calendarEvent.Start.DateTimeDateTimeOffset; // Use the direct DateTimeOffset property!
+                }
+                else if (calendarEvent.Start.Date != null)
+                {
+                    if (DateTime.TryParse(calendarEvent.Start.Date, out DateTime startDate))
+                    {
+                        // Date-only events are treated as UTC midnight
+                        return new DateTimeOffset(startDate, TimeSpan.Zero);
+                    }
+                    else
+                    {
+                        return null;
+                    }
+                }
+            }
+
+            return null; // Start time not found
+        }
+
+        /// <summary>
+        /// Calculates the duration of a Google Calendar Event in minutes.
+        /// Handles date-only and date-time events, but *does not* handle recurring events correctly.
+        /// For recurring events, this method will return the duration of the *first* instance.
+        /// </summary>
+        /// <param name="calendarEvent">The Google Calendar Event object.</param>
+        /// <returns>The duration of the event in minutes, or null if it cannot be determined.</returns>
+        public static int? GetEventDurationInMinutes(this Event calendarEvent)
+        {
+            if (calendarEvent == null)
+            {
+                return null;
+            }
+
+            DateTimeOffset? start = calendarEvent.GetEventStartDateTimeOffset();
+            if (start == null)
+            {
+                return null;
+            }
+
+            DateTimeOffset? end = null;
+            if (calendarEvent.End != null)
+            {
+                if (calendarEvent.End.DateTimeDateTimeOffset != null)
+                {
+                    end = calendarEvent.End.DateTimeDateTimeOffset;
+                }
+                else if (calendarEvent.End.Date != null)
+                {
+                    if (DateTime.TryParse(calendarEvent.End.Date, out DateTime endDate))
+                    {
+                        end = new DateTimeOffset(endDate, TimeSpan.Zero);
+                    }
+                    else
+                    {
+                        return null;
+                    }
+                }
+            }
+
+            if (end == null)
+            {
+                return null;
+            }
+
+            return (int)(end.Value - start.Value).TotalMinutes;
+        }
+
+
+        /// <summary>
+        /// RRULE, EXRULE, RDATE and EXDATE lines for a recurring event, as specified in RFC5545.
+        /// 
+        /// </summary>
+        /// <returns>___ separated lines.</returns>
+        public static string GetRecurrenceString(this Event calendarEvent)
+        {
+            if (calendarEvent == null || calendarEvent.Recurrence == null || !calendarEvent.Recurrence.Any())
+            {
+                return null;
+            }
+
+            return string.Join("___", calendarEvent.Recurrence);
+        }
     }
 }
diff --git a/Wino.Core/Integration/Processors/DefaultChangeProcessor.cs b/Wino.Core/Integration/Processors/DefaultChangeProcessor.cs
index 9c9e501f..83627f14 100644
--- a/Wino.Core/Integration/Processors/DefaultChangeProcessor.cs
+++ b/Wino.Core/Integration/Processors/DefaultChangeProcessor.cs
@@ -1,7 +1,9 @@
 using System;
 using System.Collections.Generic;
 using System.Threading.Tasks;
+using Google.Apis.Calendar.v3.Data;
 using MimeKit;
+using Wino.Core.Domain.Entities.Calendar;
 using Wino.Core.Domain.Entities.Mail;
 using Wino.Core.Domain.Entities.Shared;
 using Wino.Core.Domain.Interfaces;
@@ -32,28 +34,28 @@ namespace Wino.Core.Integration.Processors
         Task DeleteFolderAsync(Guid accountId, string remoteFolderId);
         Task InsertFolderAsync(MailItemFolder folder);
         Task UpdateFolderAsync(MailItemFolder folder);
-
-        /// <summary>
-        /// Returns the list of folders that are available for account.
-        /// </summary>
-        /// <param name="accountId">Account id to get folders for.</param>
-        /// <returns>All folders.</returns>
         Task<List<MailItemFolder>> GetLocalFoldersAsync(Guid accountId);
-
-
         Task<List<MailItemFolder>> GetSynchronizationFoldersAsync(MailSynchronizationOptions options);
-
         Task<bool> MapLocalDraftAsync(Guid accountId, Guid localDraftCopyUniqueId, string newMailCopyId, string newDraftId, string newThreadId);
         Task UpdateFolderLastSyncDateAsync(Guid folderId);
-
         Task<List<MailItemFolder>> GetExistingFoldersAsync(Guid accountId);
         Task UpdateRemoteAliasInformationAsync(MailAccount account, List<RemoteAccountAlias> remoteAccountAliases);
+
+        // Calendar
+        Task<List<AccountCalendar>> GetAccountCalendarsAsync(Guid accountId);
+
+        Task DeleteCalendarItemAsync(Guid calendarItemId);
+
+        Task DeleteAccountCalendarAsync(AccountCalendar accountCalendar);
+        Task InsertAccountCalendarAsync(AccountCalendar accountCalendar);
+        Task UpdateAccountCalendarAsync(AccountCalendar accountCalendar);
     }
 
     public interface IGmailChangeProcessor : IDefaultChangeProcessor
     {
         Task MapLocalDraftAsync(string mailCopyId, string newDraftId, string newThreadId);
         Task CreateAssignmentAsync(Guid accountId, string mailCopyId, string remoteFolderId);
+        Task<CalendarItem> CreateCalendarItemAsync(Event calendarEvent, AccountCalendar assignedCalendar, MailAccount organizerAccount);
     }
 
     public interface IOutlookChangeProcessor : IDefaultChangeProcessor
@@ -115,13 +117,15 @@ namespace Wino.Core.Integration.Processors
     public class DefaultChangeProcessor(IDatabaseService databaseService,
                                   IFolderService folderService,
                                   IMailService mailService,
+                                  ICalendarService calendarService,
                                   IAccountService accountService,
                                   IMimeFileService mimeFileService) : BaseDatabaseService(databaseService), IDefaultChangeProcessor
     {
         protected IMailService MailService = mailService;
-
+        protected ICalendarService CalendarService = calendarService;
         protected IFolderService FolderService = folderService;
         protected IAccountService AccountService = accountService;
+
         private readonly IMimeFileService _mimeFileService = mimeFileService;
 
         public Task<string> UpdateAccountDeltaSynchronizationIdentifierAsync(Guid accountId, string synchronizationDeltaIdentifier)
@@ -179,5 +183,20 @@ namespace Wino.Core.Integration.Processors
 
         public Task UpdateRemoteAliasInformationAsync(MailAccount account, List<RemoteAccountAlias> remoteAccountAliases)
             => AccountService.UpdateRemoteAliasInformationAsync(account, remoteAccountAliases);
+
+        public Task<List<AccountCalendar>> GetAccountCalendarsAsync(Guid accountId)
+            => CalendarService.GetAccountCalendarsAsync(accountId);
+
+        public Task DeleteCalendarItemAsync(Guid calendarItemId)
+            => CalendarService.DeleteCalendarItemAsync(calendarItemId);
+
+        public Task DeleteAccountCalendarAsync(AccountCalendar accountCalendar)
+            => CalendarService.DeleteAccountCalendarAsync(accountCalendar);
+
+        public Task InsertAccountCalendarAsync(AccountCalendar accountCalendar)
+            => CalendarService.InsertAccountCalendarAsync(accountCalendar);
+
+        public Task UpdateAccountCalendarAsync(AccountCalendar accountCalendar)
+            => CalendarService.UpdateAccountCalendarAsync(accountCalendar);
     }
 }
diff --git a/Wino.Core/Integration/Processors/GmailChangeProcessor.cs b/Wino.Core/Integration/Processors/GmailChangeProcessor.cs
index 5615bce8..2ff9605f 100644
--- a/Wino.Core/Integration/Processors/GmailChangeProcessor.cs
+++ b/Wino.Core/Integration/Processors/GmailChangeProcessor.cs
@@ -1,14 +1,28 @@
 using System;
+using System.Collections.Generic;
 using System.Threading.Tasks;
+using Google.Apis.Calendar.v3.Data;
+using Wino.Core.Domain.Entities.Calendar;
+using Wino.Core.Domain.Entities.Shared;
+using Wino.Core.Domain.Enums;
 using Wino.Core.Domain.Interfaces;
+using Wino.Core.Extensions;
 using Wino.Services;
+using CalendarEventAttendee = Wino.Core.Domain.Entities.Calendar.CalendarEventAttendee;
+using CalendarItem = Wino.Core.Domain.Entities.Calendar.CalendarItem;
 
 namespace Wino.Core.Integration.Processors
 {
     public class GmailChangeProcessor : DefaultChangeProcessor, IGmailChangeProcessor
     {
-        public GmailChangeProcessor(IDatabaseService databaseService, IFolderService folderService, IMailService mailService, IAccountService accountService, IMimeFileService mimeFileService) : base(databaseService, folderService, mailService, accountService, mimeFileService)
+        public GmailChangeProcessor(IDatabaseService databaseService,
+                                    IFolderService folderService,
+                                    IMailService mailService,
+                                    ICalendarService calendarService,
+                                    IAccountService accountService,
+                                    IMimeFileService mimeFileService) : base(databaseService, folderService, mailService, calendarService, accountService, mimeFileService)
         {
+
         }
 
         public Task MapLocalDraftAsync(string mailCopyId, string newDraftId, string newThreadId)
@@ -16,5 +30,116 @@ namespace Wino.Core.Integration.Processors
 
         public Task CreateAssignmentAsync(Guid accountId, string mailCopyId, string remoteFolderId)
             => MailService.CreateAssignmentAsync(accountId, mailCopyId, remoteFolderId);
+
+        public async Task<CalendarItem> CreateCalendarItemAsync(Event calendarEvent, AccountCalendar assignedCalendar, MailAccount organizerAccount)
+        {
+            var calendarItem = new CalendarItem()
+            {
+                CalendarId = assignedCalendar.Id,
+                CreatedAt = DateTimeOffset.UtcNow,
+                Description = calendarEvent.Description,
+                StartTime = GoogleIntegratorExtensions.GetEventStartDateTimeOffset(calendarEvent) ?? throw new Exception("Event without a start time."),
+                DurationInMinutes = GoogleIntegratorExtensions.GetEventDurationInMinutes(calendarEvent) ?? throw new Exception("Event without a duration."),
+                Id = Guid.NewGuid(),
+                Location = calendarEvent.Location,
+                Recurrence = GoogleIntegratorExtensions.GetRecurrenceString(calendarEvent),
+                Status = GetStatus(calendarEvent.Status),
+                Title = calendarEvent.Summary,
+                UpdatedAt = DateTimeOffset.UtcNow,
+                Visibility = GetVisibility(calendarEvent.Visibility),
+            };
+
+            // TODO: There are some edge cases with cancellation here.
+            CalendarItemStatus GetStatus(string status)
+            {
+                return status switch
+                {
+                    "confirmed" => CalendarItemStatus.Confirmed,
+                    "tentative" => CalendarItemStatus.Tentative,
+                    "cancelled" => CalendarItemStatus.Cancelled,
+                    _ => CalendarItemStatus.Confirmed
+                };
+            }
+
+            CalendarItemVisibility GetVisibility(string visibility)
+            {
+                /// Visibility of the event. Optional. Possible values are:   - "default" - Uses the default visibility for
+                /// events on the calendar. This is the default value.  - "public" - The event is public and event details are
+                /// visible to all readers of the calendar.  - "private" - The event is private and only event attendees may
+                /// view event details.  - "confidential" - The event is private. This value is provided for compatibility
+                /// reasons.
+
+                return visibility switch
+                {
+                    "default" => CalendarItemVisibility.Default,
+                    "public" => CalendarItemVisibility.Public,
+                    "private" => CalendarItemVisibility.Private,
+                    "confidential" => CalendarItemVisibility.Confidential,
+                    _ => CalendarItemVisibility.Default
+                };
+            }
+
+            // Attendees
+            var attendees = new List<CalendarEventAttendee>();
+
+            if (calendarEvent.Attendees == null)
+            {
+                // Self-only event.
+
+                attendees.Add(new CalendarEventAttendee()
+                {
+                    CalendarItemId = calendarItem.Id,
+                    IsOrganizer = true,
+                    Email = organizerAccount.Address,
+                    Name = organizerAccount.SenderName,
+                    AttendenceStatus = AttendeeStatus.Accepted,
+                    Id = Guid.NewGuid(),
+                    IsOptionalAttendee = false,
+                });
+            }
+            else
+            {
+                foreach (var attendee in calendarEvent.Attendees)
+                {
+                    if (attendee.Self == true)
+                    {
+                        // TODO: 
+                    }
+                    else if (!string.IsNullOrEmpty(attendee.Email))
+                    {
+                        AttendeeStatus GetAttendenceStatus(string responseStatus)
+                        {
+                            return responseStatus switch
+                            {
+                                "accepted" => AttendeeStatus.Accepted,
+                                "declined" => AttendeeStatus.Declined,
+                                "tentative" => AttendeeStatus.Tentative,
+                                "needsAction" => AttendeeStatus.NeedsAction,
+                                _ => AttendeeStatus.NeedsAction
+                            };
+                        }
+
+                        var eventAttendee = new CalendarEventAttendee()
+                        {
+                            CalendarItemId = calendarItem.Id,
+                            IsOrganizer = attendee.Organizer ?? false,
+                            Comment = attendee.Comment,
+                            Email = attendee.Email,
+                            Name = attendee.DisplayName,
+                            AttendenceStatus = GetAttendenceStatus(attendee.ResponseStatus),
+                            Id = Guid.NewGuid(),
+                            IsOptionalAttendee = attendee.Optional ?? false,
+                        };
+
+                        attendees.Add(eventAttendee);
+                    }
+                }
+            }
+
+
+            await CalendarService.CreateNewCalendarItemAsync(calendarItem, attendees);
+
+            return calendarItem;
+        }
     }
 }
diff --git a/Wino.Core/Integration/Processors/ImapChangeProcessor.cs b/Wino.Core/Integration/Processors/ImapChangeProcessor.cs
index 7271926e..fe6fe214 100644
--- a/Wino.Core/Integration/Processors/ImapChangeProcessor.cs
+++ b/Wino.Core/Integration/Processors/ImapChangeProcessor.cs
@@ -12,7 +12,8 @@ namespace Wino.Core.Integration.Processors
                                    IFolderService folderService,
                                    IMailService mailService,
                                    IAccountService accountService,
-                                   IMimeFileService mimeFileService) : base(databaseService, folderService, mailService, accountService, mimeFileService)
+                                   ICalendarService calendarService,
+                                   IMimeFileService mimeFileService) : base(databaseService, folderService, mailService, calendarService, accountService, mimeFileService)
         {
         }
 
diff --git a/Wino.Core/Integration/Processors/OutlookChangeProcessor.cs b/Wino.Core/Integration/Processors/OutlookChangeProcessor.cs
index 3086b687..a8159820 100644
--- a/Wino.Core/Integration/Processors/OutlookChangeProcessor.cs
+++ b/Wino.Core/Integration/Processors/OutlookChangeProcessor.cs
@@ -7,9 +7,10 @@ namespace Wino.Core.Integration.Processors
 {
     public class OutlookChangeProcessor(IDatabaseService databaseService,
                                         IFolderService folderService,
+                                        ICalendarService calendarService,
                                         IMailService mailService,
                                         IAccountService accountService,
-                                        IMimeFileService mimeFileService) : DefaultChangeProcessor(databaseService, folderService, mailService, accountService, mimeFileService)
+                                        IMimeFileService mimeFileService) : DefaultChangeProcessor(databaseService, folderService, mailService, calendarService, accountService, mimeFileService)
         , IOutlookChangeProcessor
     {
         public Task<bool> IsMailExistsAsync(string messageId)
diff --git a/Wino.Core/Services/WinoRequestDelegator.cs b/Wino.Core/Services/WinoRequestDelegator.cs
index b3a4705d..cd985853 100644
--- a/Wino.Core/Services/WinoRequestDelegator.cs
+++ b/Wino.Core/Services/WinoRequestDelegator.cs
@@ -149,7 +149,7 @@ namespace Wino.Core.Services
                 Type = MailSynchronizationType.ExecuteRequests
             };
 
-            WeakReferenceMessenger.Default.Send(new NewSynchronizationRequested(options, SynchronizationSource.Client));
+            WeakReferenceMessenger.Default.Send(new NewMailSynchronizationRequested(options, SynchronizationSource.Client));
         }
 
         private async Task EnsureServerConnectedAsync()
diff --git a/Wino.Core/Synchronizers/GmailSynchronizer.cs b/Wino.Core/Synchronizers/GmailSynchronizer.cs
index 567b927a..9c170daa 100644
--- a/Wino.Core/Synchronizers/GmailSynchronizer.cs
+++ b/Wino.Core/Synchronizers/GmailSynchronizer.cs
@@ -17,6 +17,7 @@ using Microsoft.IdentityModel.Tokens;
 using MimeKit;
 using MoreLinq;
 using Serilog;
+using Wino.Core.Domain.Entities.Calendar;
 using Wino.Core.Domain.Entities.Mail;
 using Wino.Core.Domain.Entities.Shared;
 using Wino.Core.Domain.Enums;
@@ -33,6 +34,7 @@ using Wino.Core.Requests.Folder;
 using Wino.Core.Requests.Mail;
 using Wino.Messaging.UI;
 using Wino.Services;
+using CalendarService = Google.Apis.Calendar.v3.CalendarService;
 
 namespace Wino.Core.Synchronizers.Mail
 {
@@ -47,6 +49,7 @@ namespace Wino.Core.Synchronizers.Mail
 
         private readonly ConfigurableHttpClient _googleHttpClient;
         private readonly GmailService _gmailService;
+        private readonly CalendarService _calendarService;
         private readonly PeopleServiceService _peopleService;
 
         private readonly IGmailChangeProcessor _gmailChangeProcessor;
@@ -64,9 +67,10 @@ namespace Wino.Core.Synchronizers.Mail
             };
 
             _googleHttpClient = new ConfigurableHttpClient(messageHandler);
-
             _gmailService = new GmailService(initializer);
             _peopleService = new PeopleServiceService(initializer);
+            _calendarService = new CalendarService(initializer);
+
             _gmailChangeProcessor = gmailChangeProcessor;
         }
 
@@ -284,109 +288,258 @@ namespace Wino.Core.Synchronizers.Mail
             return MailSynchronizationResult.Completed(unreadNewItems);
         }
 
-        protected override Task<CalendarSynchronizationResult> SynchronizeCalendarEventsInternalAsync(CalendarSynchronizationOptions options, CancellationToken cancellationToken = default)
+        protected override async Task<CalendarSynchronizationResult> SynchronizeCalendarEventsInternalAsync(CalendarSynchronizationOptions options, CancellationToken cancellationToken = default)
         {
             _logger.Information("Internal calendar synchronization started for {Name}", Account.Name);
 
+            cancellationToken.ThrowIfCancellationRequested();
+
+            await SynchronizeCalendarsAsync(cancellationToken).ConfigureAwait(false);
+
+            bool isInitialSync = string.IsNullOrEmpty(Account.SynchronizationDeltaIdentifier);
+
+            _logger.Debug("Is initial synchronization: {IsInitialSync}", isInitialSync);
+
+            var localCalendars = await _gmailChangeProcessor.GetAccountCalendarsAsync(Account.Id).ConfigureAwait(false);
+
+            // TODO: Better logging and exception handling.
+            foreach (var calendar in localCalendars)
+            {
+                var request = _calendarService.Events.List(calendar.RemoteCalendarId);
+
+                request.SingleEvents = false;
+                request.ShowDeleted = true;
+
+                if (!string.IsNullOrEmpty(calendar.SynchronizationDeltaToken))
+                {
+                    // If a sync token is available, perform an incremental sync
+                    request.SyncToken = calendar.SynchronizationDeltaToken;
+                }
+                else
+                {
+                    // If no sync token, perform an initial sync
+                    // Fetch events from the past year
+
+                    request.TimeMinDateTimeOffset = DateTimeOffset.UtcNow.AddYears(-1);
+                }
+
+                string nextPageToken;
+                string syncToken;
+
+                var allEvents = new List<Event>();
+
+                do
+                {
+                    // Execute the request
+                    var events = await request.ExecuteAsync();
+
+                    // Process the fetched events
+                    if (events.Items != null)
+                    {
+                        allEvents.AddRange(events.Items);
+                    }
+
+                    // Get the next page token and sync token
+                    nextPageToken = events.NextPageToken;
+                    syncToken = events.NextSyncToken;
+
+                    // Set the next page token for subsequent requests
+                    request.PageToken = nextPageToken;
+
+                } while (!string.IsNullOrEmpty(nextPageToken));
+
+                calendar.SynchronizationDeltaToken = syncToken;
+
+                await _gmailChangeProcessor.UpdateAccountCalendarAsync(calendar).ConfigureAwait(false);
+
+                foreach (var @event in allEvents)
+                {
+                    // TODO: Exception handling for event processing.
+                    await _gmailChangeProcessor.CreateCalendarItemAsync(@event, calendar, Account).ConfigureAwait(false);
+                }
+            }
+
             return default;
         }
 
-        private async Task SynchronizeFoldersAsync(CancellationToken cancellationToken = default)
+        private async Task SynchronizeCalendarsAsync(CancellationToken cancellationToken = default)
         {
-            try
+            var calendarListRequest = _calendarService.CalendarList.List();
+            var calendarListResponse = await calendarListRequest.ExecuteAsync(cancellationToken).ConfigureAwait(false);
+
+            if (calendarListResponse.Items == null)
             {
-                var localFolders = await _gmailChangeProcessor.GetLocalFoldersAsync(Account.Id).ConfigureAwait(false);
-                var folderRequest = _gmailService.Users.Labels.List("me");
+                _logger.Warning("No calendars found for {Name}", Account.Name);
+                return;
+            }
 
-                var labelsResponse = await folderRequest.ExecuteAsync(cancellationToken).ConfigureAwait(false);
+            var localCalendars = await _gmailChangeProcessor.GetAccountCalendarsAsync(Account.Id).ConfigureAwait(false);
 
-                if (labelsResponse.Labels == null)
+            List<AccountCalendar> insertedCalendars = new();
+            List<AccountCalendar> updatedCalendars = new();
+            List<AccountCalendar> deletedCalendars = new();
+
+            // 1. Handle deleted calendars.
+
+            foreach (var calendar in localCalendars)
+            {
+                var remoteCalendar = calendarListResponse.Items.FirstOrDefault(a => a.Id == calendar.RemoteCalendarId);
+                if (remoteCalendar == null)
                 {
-                    _logger.Warning("No folders found for {Name}", Account.Name);
-                    return;
+                    // Local calendar doesn't exists remotely. Delete local copy.
+
+                    await _gmailChangeProcessor.DeleteAccountCalendarAsync(calendar).ConfigureAwait(false);
+                    deletedCalendars.Add(calendar);
                 }
+            }
 
-                List<MailItemFolder> insertedFolders = new();
-                List<MailItemFolder> updatedFolders = new();
-                List<MailItemFolder> deletedFolders = new();
+            // Delete the deleted folders from local list.
+            deletedCalendars.ForEach(a => localCalendars.Remove(a));
 
-                // 1. Handle deleted labels.
-
-                foreach (var localFolder in localFolders)
+            // 2. Handle update/insert based on remote calendars.
+            foreach (var calendar in calendarListResponse.Items)
+            {
+                var existingLocalCalendar = localCalendars.FirstOrDefault(a => a.RemoteCalendarId == calendar.Id);
+                if (existingLocalCalendar == null)
                 {
-                    // Category folder is virtual folder for Wino. Skip it.
-                    if (localFolder.SpecialFolderType == SpecialFolderType.Category) continue;
-
-                    var remoteFolder = labelsResponse.Labels.FirstOrDefault(a => a.Id == localFolder.RemoteFolderId);
-
-                    if (remoteFolder == null)
-                    {
-                        // Local folder doesn't exists remotely. Delete local copy.
-                        await _gmailChangeProcessor.DeleteFolderAsync(Account.Id, localFolder.RemoteFolderId).ConfigureAwait(false);
-
-                        deletedFolders.Add(localFolder);
-                    }
+                    // Insert new calendar.
+                    var localCalendar = calendar.AsCalendar(Account.Id);
+                    insertedCalendars.Add(localCalendar);
                 }
-
-                // Delete the deleted folders from local list.
-                deletedFolders.ForEach(a => localFolders.Remove(a));
-
-                // 2. Handle update/insert based on remote folders.
-                foreach (var remoteFolder in labelsResponse.Labels)
+                else
                 {
-                    var existingLocalFolder = localFolders.FirstOrDefault(a => a.RemoteFolderId == remoteFolder.Id);
-
-                    if (existingLocalFolder == null)
+                    // Update existing calendar. Right now we only update the name.
+                    if (ShouldUpdateCalendar(calendar, existingLocalCalendar))
                     {
-                        // Insert new folder.
-                        var localFolder = remoteFolder.GetLocalFolder(labelsResponse, Account.Id);
+                        existingLocalCalendar.Name = calendar.Summary;
 
-                        insertedFolders.Add(localFolder);
+                        updatedCalendars.Add(existingLocalCalendar);
                     }
                     else
                     {
-                        // Update existing folder. Right now we only update the name.
-
-                        // TODO: Moving folders around different parents. This is not supported right now.
-                        // We will need more comphrensive folder update mechanism to support this.
-
-                        if (ShouldUpdateFolder(remoteFolder, existingLocalFolder))
-                        {
-                            existingLocalFolder.FolderName = remoteFolder.Name;
-                            existingLocalFolder.TextColorHex = remoteFolder.Color?.TextColor;
-                            existingLocalFolder.BackgroundColorHex = remoteFolder.Color?.BackgroundColor;
-
-                            updatedFolders.Add(existingLocalFolder);
-                        }
-                        else
-                        {
-                            // Remove it from the local folder list to skip additional folder updates.
-                            localFolders.Remove(existingLocalFolder);
-                        }
+                        // Remove it from the local folder list to skip additional calendar updates.
+                        localCalendars.Remove(existingLocalCalendar);
                     }
                 }
-
-                // 3.Process changes in order-> Insert, Update. Deleted ones are already processed.
-
-                foreach (var folder in insertedFolders)
-                {
-                    await _gmailChangeProcessor.InsertFolderAsync(folder).ConfigureAwait(false);
-                }
-
-                foreach (var folder in updatedFolders)
-                {
-                    await _gmailChangeProcessor.UpdateFolderAsync(folder).ConfigureAwait(false);
-                }
-
-                if (insertedFolders.Any() || deletedFolders.Any() || updatedFolders.Any())
-                {
-                    WeakReferenceMessenger.Default.Send(new AccountFolderConfigurationUpdated(Account.Id));
-                }
             }
-            catch (Exception)
+
+            // 3.Process changes in order-> Insert, Update. Deleted ones are already processed.
+            foreach (var calendar in insertedCalendars)
             {
-                throw;
+                await _gmailChangeProcessor.InsertAccountCalendarAsync(calendar).ConfigureAwait(false);
             }
+
+            foreach (var calendar in updatedCalendars)
+            {
+                await _gmailChangeProcessor.UpdateAccountCalendarAsync(calendar).ConfigureAwait(false);
+            }
+
+            if (insertedCalendars.Any() || deletedCalendars.Any() || updatedCalendars.Any())
+            {
+                // TODO: Notify calendar updates.
+                // WeakReferenceMessenger.Default.Send(new AccountFolderConfigurationUpdated(Account.Id));
+            }
+        }
+
+        private async Task SynchronizeFoldersAsync(CancellationToken cancellationToken = default)
+        {
+            var localFolders = await _gmailChangeProcessor.GetLocalFoldersAsync(Account.Id).ConfigureAwait(false);
+            var folderRequest = _gmailService.Users.Labels.List("me");
+
+            var labelsResponse = await folderRequest.ExecuteAsync(cancellationToken).ConfigureAwait(false);
+
+            if (labelsResponse.Labels == null)
+            {
+                _logger.Warning("No folders found for {Name}", Account.Name);
+                return;
+            }
+
+            List<MailItemFolder> insertedFolders = new();
+            List<MailItemFolder> updatedFolders = new();
+            List<MailItemFolder> deletedFolders = new();
+
+            // 1. Handle deleted labels.
+
+            foreach (var localFolder in localFolders)
+            {
+                // Category folder is virtual folder for Wino. Skip it.
+                if (localFolder.SpecialFolderType == SpecialFolderType.Category) continue;
+
+                var remoteFolder = labelsResponse.Labels.FirstOrDefault(a => a.Id == localFolder.RemoteFolderId);
+
+                if (remoteFolder == null)
+                {
+                    // Local folder doesn't exists remotely. Delete local copy.
+                    await _gmailChangeProcessor.DeleteFolderAsync(Account.Id, localFolder.RemoteFolderId).ConfigureAwait(false);
+
+                    deletedFolders.Add(localFolder);
+                }
+            }
+
+            // Delete the deleted folders from local list.
+            deletedFolders.ForEach(a => localFolders.Remove(a));
+
+            // 2. Handle update/insert based on remote folders.
+            foreach (var remoteFolder in labelsResponse.Labels)
+            {
+                var existingLocalFolder = localFolders.FirstOrDefault(a => a.RemoteFolderId == remoteFolder.Id);
+
+                if (existingLocalFolder == null)
+                {
+                    // Insert new folder.
+                    var localFolder = remoteFolder.GetLocalFolder(labelsResponse, Account.Id);
+
+                    insertedFolders.Add(localFolder);
+                }
+                else
+                {
+                    // Update existing folder. Right now we only update the name.
+
+                    // TODO: Moving folders around different parents. This is not supported right now.
+                    // We will need more comphrensive folder update mechanism to support this.
+
+                    if (ShouldUpdateFolder(remoteFolder, existingLocalFolder))
+                    {
+                        existingLocalFolder.FolderName = remoteFolder.Name;
+                        existingLocalFolder.TextColorHex = remoteFolder.Color?.TextColor;
+                        existingLocalFolder.BackgroundColorHex = remoteFolder.Color?.BackgroundColor;
+
+                        updatedFolders.Add(existingLocalFolder);
+                    }
+                    else
+                    {
+                        // Remove it from the local folder list to skip additional folder updates.
+                        localFolders.Remove(existingLocalFolder);
+                    }
+                }
+            }
+
+            // 3.Process changes in order-> Insert, Update. Deleted ones are already processed.
+
+            foreach (var folder in insertedFolders)
+            {
+                await _gmailChangeProcessor.InsertFolderAsync(folder).ConfigureAwait(false);
+            }
+
+            foreach (var folder in updatedFolders)
+            {
+                await _gmailChangeProcessor.UpdateFolderAsync(folder).ConfigureAwait(false);
+            }
+
+            if (insertedFolders.Any() || deletedFolders.Any() || updatedFolders.Any())
+            {
+                WeakReferenceMessenger.Default.Send(new AccountFolderConfigurationUpdated(Account.Id));
+            }
+        }
+
+        private bool ShouldUpdateCalendar(CalendarListEntry calendarListEntry, AccountCalendar accountCalendar)
+        {
+            // TODO: Only calendar name is updated for now. We can add more checks here.
+
+            var remoteCalendarName = calendarListEntry.Summary;
+            var localCalendarName = accountCalendar.Name;
+
+            return !localCalendarName.Equals(remoteCalendarName, StringComparison.OrdinalIgnoreCase);
         }
 
         private bool ShouldUpdateFolder(Label remoteFolder, MailItemFolder existingLocalFolder)
diff --git a/Wino.Core/Synchronizers/WinoSynchronizer.cs b/Wino.Core/Synchronizers/WinoSynchronizer.cs
index 96b739e4..e9ee1848 100644
--- a/Wino.Core/Synchronizers/WinoSynchronizer.cs
+++ b/Wino.Core/Synchronizers/WinoSynchronizer.cs
@@ -257,6 +257,18 @@ namespace Wino.Core.Synchronizers
             }
         }
 
+        /// <summary>
+        /// Batches network requests, executes them, and does the needed synchronization after the batch request execution.
+        /// </summary>
+        /// <param name="options">Synchronization options.</param>
+        /// <param name="cancellationToken">Cancellation token.</param>
+        /// <returns>Synchronization result that contains summary of the sync.</returns>
+        public Task<CalendarSynchronizationResult> SynchronizeCalendarEventsAsync(CalendarSynchronizationOptions options, CancellationToken cancellationToken = default)
+        {
+            // TODO: Execute requests for calendar events.
+            return SynchronizeCalendarEventsInternalAsync(options, cancellationToken);
+        }
+
         /// <summary>
         /// Updates unread item counts for some folders and account.
         /// Sends a message that shell can pick up and update the UI.
@@ -355,5 +367,7 @@ namespace Wino.Core.Synchronizers
 
             return ret;
         }
+
+
     }
 }
diff --git a/Wino.Core/Wino.Core.csproj b/Wino.Core/Wino.Core.csproj
index 823e76f3..529f4a39 100644
--- a/Wino.Core/Wino.Core.csproj
+++ b/Wino.Core/Wino.Core.csproj
@@ -36,6 +36,7 @@
      <PackageReference Include="MimeKit" Version="4.9.0" />
      <PackageReference Include="morelinq" Version="4.3.0" />
      <PackageReference Include="Nito.AsyncEx.Tasks" Version="5.1.2" />
+     <PackageReference Include="NodaTime" Version="3.2.0" />
      <PackageReference Include="Serilog" Version="4.1.0" />
      <PackageReference Include="Serilog.Exceptions" Version="8.4.0" />
      <PackageReference Include="Serilog.Sinks.Debug" Version="3.0.0" />
diff --git a/Wino.Mail/App.xaml.cs b/Wino.Mail/App.xaml.cs
index 943194a1..4154323a 100644
--- a/Wino.Mail/App.xaml.cs
+++ b/Wino.Mail/App.xaml.cs
@@ -29,7 +29,7 @@ using Wino.Services;
 
 namespace Wino
 {
-    public sealed partial class App : WinoApplication, IRecipient<NewSynchronizationRequested>
+    public sealed partial class App : WinoApplication, IRecipient<NewMailSynchronizationRequested>
     {
         public override string AppCenterKey { get; } = "90deb1d0-a77f-47d0-8a6b-7eaf111c6b72";
 
@@ -224,11 +224,11 @@ namespace Wino
             AppServiceConnectionManager.Connection = null;
         }
 
-        public async void Receive(NewSynchronizationRequested message)
+        public async void Receive(NewMailSynchronizationRequested message)
         {
             try
             {
-                var synchronizationResultResponse = await AppServiceConnectionManager.GetResponseAsync<MailSynchronizationResult, NewSynchronizationRequested>(message);
+                var synchronizationResultResponse = await AppServiceConnectionManager.GetResponseAsync<MailSynchronizationResult, NewMailSynchronizationRequested>(message);
                 synchronizationResultResponse.ThrowIfFailed();
             }
             catch (WinoServerException serverException)
diff --git a/Wino.Messages/Client/Calendar/CalendarEventMessages.cs b/Wino.Messages/Client/Calendar/CalendarEventMessages.cs
new file mode 100644
index 00000000..b7ef07a2
--- /dev/null
+++ b/Wino.Messages/Client/Calendar/CalendarEventMessages.cs
@@ -0,0 +1,10 @@
+using System.Collections.Generic;
+using Wino.Core.Domain.Entities.Calendar;
+
+namespace Wino.Messaging.Client.Calendar
+{
+    public record CalendarListRefreshed(List<AccountCalendar> AccountCalendars);
+    public record CalendarListAdded(AccountCalendar AccountCalendar);
+    public record CalendarListUpdated(AccountCalendar AccountCalendar);
+    public record CalendarListDeleted(AccountCalendar AccountCalendar);
+}
diff --git a/Wino.Messages/Client/Calendar/CalendarItemEventMessages.cs b/Wino.Messages/Client/Calendar/CalendarItemEventMessages.cs
new file mode 100644
index 00000000..70e73b03
--- /dev/null
+++ b/Wino.Messages/Client/Calendar/CalendarItemEventMessages.cs
@@ -0,0 +1,8 @@
+using Wino.Core.Domain.Entities.Calendar;
+
+namespace Wino.Messaging.Client.Calendar
+{
+    public record CalendarItemAdded(CalendarItem CalendarItem);
+    public record CalendarItemUpdated(CalendarItem CalendarItem);
+    public record CalendarItemDeleted(CalendarItem CalendarItem);
+}
diff --git a/Wino.Messages/Server/NewSynchronizationRequested.cs b/Wino.Messages/Server/NewSynchronizationRequested.cs
index 85610c83..64261cd5 100644
--- a/Wino.Messages/Server/NewSynchronizationRequested.cs
+++ b/Wino.Messages/Server/NewSynchronizationRequested.cs
@@ -5,8 +5,14 @@ using Wino.Core.Domain.Models.Synchronization;
 namespace Wino.Messaging.Server
 {
     /// <summary>
-    /// Triggers a new synchronization if possible.
+    /// Triggers a new mail synchronization if possible.
     /// </summary>
     /// <param name="Options">Options for synchronization.</param>
-    public record NewSynchronizationRequested(MailSynchronizationOptions Options, SynchronizationSource Source) : IClientMessage;
+    public record NewMailSynchronizationRequested(MailSynchronizationOptions Options, SynchronizationSource Source) : IClientMessage;
+
+    /// <summary>
+    /// Triggers a new calendar synchronization if possible.
+    /// </summary>
+    /// <param name="Options">Options for synchronization.</param>
+    public record NewCalendarSynchronizationRequested(CalendarSynchronizationOptions Options, SynchronizationSource Source) : IClientMessage;
 }
diff --git a/Wino.Server/Core/ServerMessageHandlerFactory.cs b/Wino.Server/Core/ServerMessageHandlerFactory.cs
index c1af89b5..790bf021 100644
--- a/Wino.Server/Core/ServerMessageHandlerFactory.cs
+++ b/Wino.Server/Core/ServerMessageHandlerFactory.cs
@@ -14,7 +14,8 @@ namespace Wino.Server.Core
         {
             return typeName switch
             {
-                nameof(NewSynchronizationRequested) => App.Current.Services.GetService<SynchronizationRequestHandler>(),
+                nameof(NewMailSynchronizationRequested) => App.Current.Services.GetService<MailSynchronizationRequestHandler>(),
+                nameof(NewCalendarSynchronizationRequested) => App.Current.Services.GetService<CalendarSynchronizationRequestHandler>(),
                 nameof(ServerRequestPackage) => App.Current.Services.GetService<UserActionRequestHandler>(),
                 nameof(DownloadMissingMessageRequested) => App.Current.Services.GetService<SingleMimeDownloadHandler>(),
                 nameof(AuthorizationRequested) => App.Current.Services.GetService<AuthenticationHandler>(),
@@ -31,7 +32,8 @@ namespace Wino.Server.Core
         {
             // Register all known handlers.
 
-            serviceCollection.AddTransient<SynchronizationRequestHandler>();
+            serviceCollection.AddTransient<MailSynchronizationRequestHandler>();
+            serviceCollection.AddTransient<CalendarSynchronizationRequestHandler>();
             serviceCollection.AddTransient<UserActionRequestHandler>();
             serviceCollection.AddTransient<SingleMimeDownloadHandler>();
             serviceCollection.AddTransient<AuthenticationHandler>();
diff --git a/Wino.Server/MessageHandlers/CalendarSynchronizationRequestHandler.cs b/Wino.Server/MessageHandlers/CalendarSynchronizationRequestHandler.cs
new file mode 100644
index 00000000..9cb08d3a
--- /dev/null
+++ b/Wino.Server/MessageHandlers/CalendarSynchronizationRequestHandler.cs
@@ -0,0 +1,40 @@
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+using Wino.Core.Domain.Interfaces;
+using Wino.Core.Domain.Models.Server;
+using Wino.Core.Domain.Models.Synchronization;
+using Wino.Messaging.Server;
+using Wino.Server.Core;
+
+namespace Wino.Server.MessageHandlers
+{
+    public class CalendarSynchronizationRequestHandler : ServerMessageHandler<NewCalendarSynchronizationRequested, CalendarSynchronizationResult>
+    {
+        public override WinoServerResponse<CalendarSynchronizationResult> FailureDefaultResponse(Exception ex)
+           => WinoServerResponse<CalendarSynchronizationResult>.CreateErrorResponse(ex.Message);
+
+        private readonly ISynchronizerFactory _synchronizerFactory;
+
+        public CalendarSynchronizationRequestHandler(ISynchronizerFactory synchronizerFactory)
+        {
+            _synchronizerFactory = synchronizerFactory;
+        }
+
+        protected override async Task<WinoServerResponse<CalendarSynchronizationResult>> HandleAsync(NewCalendarSynchronizationRequested message, CancellationToken cancellationToken = default)
+        {
+            var synchronizer = await _synchronizerFactory.GetAccountSynchronizerAsync(message.Options.AccountId);
+
+            try
+            {
+                var synchronizationResult = await synchronizer.SynchronizeCalendarEventsAsync(message.Options, cancellationToken);
+
+                return WinoServerResponse<CalendarSynchronizationResult>.CreateSuccessResponse(synchronizationResult);
+            }
+            catch (Exception ex)
+            {
+                throw;
+            }
+        }
+    }
+}
diff --git a/Wino.Server/MessageHandlers/SynchronizationRequestHandler.cs b/Wino.Server/MessageHandlers/MailSynchronizationRequestHandler.cs
similarity index 91%
rename from Wino.Server/MessageHandlers/SynchronizationRequestHandler.cs
rename to Wino.Server/MessageHandlers/MailSynchronizationRequestHandler.cs
index a2c997e7..3311e605 100644
--- a/Wino.Server/MessageHandlers/SynchronizationRequestHandler.cs
+++ b/Wino.Server/MessageHandlers/MailSynchronizationRequestHandler.cs
@@ -14,9 +14,9 @@ using Wino.Server.Core;
 namespace Wino.Server.MessageHandlers
 {
     /// <summary>
-    /// Handler for NewSynchronizationRequested from the client.
+    /// Handler for NewMailSynchronizationRequested from the client.
     /// </summary>
-    public class SynchronizationRequestHandler : ServerMessageHandler<NewSynchronizationRequested, MailSynchronizationResult>
+    public class MailSynchronizationRequestHandler : ServerMessageHandler<NewMailSynchronizationRequested, MailSynchronizationResult>
     {
         public override WinoServerResponse<MailSynchronizationResult> FailureDefaultResponse(Exception ex)
             => WinoServerResponse<MailSynchronizationResult>.CreateErrorResponse(ex.Message);
@@ -25,7 +25,7 @@ namespace Wino.Server.MessageHandlers
         private readonly INotificationBuilder _notificationBuilder;
         private readonly IFolderService _folderService;
 
-        public SynchronizationRequestHandler(ISynchronizerFactory synchronizerFactory,
+        public MailSynchronizationRequestHandler(ISynchronizerFactory synchronizerFactory,
                                              INotificationBuilder notificationBuilder,
                                              IFolderService folderService)
         {
@@ -34,7 +34,7 @@ namespace Wino.Server.MessageHandlers
             _folderService = folderService;
         }
 
-        protected override async Task<WinoServerResponse<MailSynchronizationResult>> HandleAsync(NewSynchronizationRequested message, CancellationToken cancellationToken = default)
+        protected override async Task<WinoServerResponse<MailSynchronizationResult>> HandleAsync(NewMailSynchronizationRequested message, CancellationToken cancellationToken = default)
         {
             var synchronizer = await _synchronizerFactory.GetAccountSynchronizerAsync(message.Options.AccountId);
 
diff --git a/Wino.Server/ServerContext.cs b/Wino.Server/ServerContext.cs
index 8db390bd..9c14204a 100644
--- a/Wino.Server/ServerContext.cs
+++ b/Wino.Server/ServerContext.cs
@@ -84,6 +84,10 @@ namespace Wino.Server
 
         private async void SynchronizationTimerTriggered(object sender, System.Timers.ElapsedEventArgs e)
         {
+            // TODO: Disabled for calendar synchronization. Implement a separate timer for calendar synchronization.
+            // or completely separate contexts for both apps.
+            return;
+
             // Send sync request for all accounts.
 
             var accounts = await _accountService.GetAccountsAsync();
@@ -96,7 +100,7 @@ namespace Wino.Server
                     Type = MailSynchronizationType.InboxOnly,
                 };
 
-                var request = new NewSynchronizationRequested(options, SynchronizationSource.Server);
+                var request = new NewMailSynchronizationRequested(options, SynchronizationSource.Server);
 
                 await ExecuteServerMessageSafeAsync(null, request);
             }
@@ -279,10 +283,15 @@ namespace Wino.Server
         {
             switch (typeName)
             {
-                case nameof(NewSynchronizationRequested):
-                    Debug.WriteLine($"New synchronization requested.");
+                case nameof(NewMailSynchronizationRequested):
+                    Debug.WriteLine($"New mail synchronization requested.");
 
-                    await ExecuteServerMessageSafeAsync(args, JsonSerializer.Deserialize<NewSynchronizationRequested>(messageJson, _jsonSerializerOptions));
+                    await ExecuteServerMessageSafeAsync(args, JsonSerializer.Deserialize<NewMailSynchronizationRequested>(messageJson, _jsonSerializerOptions));
+                    break;
+                case nameof(NewCalendarSynchronizationRequested):
+                    Debug.WriteLine($"New calendar synchronization requested.");
+
+                    await ExecuteServerMessageSafeAsync(args, JsonSerializer.Deserialize<NewCalendarSynchronizationRequested>(messageJson, _jsonSerializerOptions));
                     break;
                 case nameof(DownloadMissingMessageRequested):
                     Debug.WriteLine($"Download missing message requested.");
diff --git a/Wino.Services/CalendarService.cs b/Wino.Services/CalendarService.cs
new file mode 100644
index 00000000..0e55074e
--- /dev/null
+++ b/Wino.Services/CalendarService.cs
@@ -0,0 +1,71 @@
+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using CommunityToolkit.Mvvm.Messaging;
+using SqlKata;
+using Wino.Core.Domain.Entities.Calendar;
+using Wino.Core.Domain.Interfaces;
+using Wino.Messaging.Client.Calendar;
+using Wino.Services.Extensions;
+
+namespace Wino.Services
+{
+    public class CalendarService : BaseDatabaseService, ICalendarService
+    {
+        public CalendarService(IDatabaseService databaseService) : base(databaseService)
+        {
+        }
+
+        public Task<List<AccountCalendar>> GetAccountCalendarsAsync(Guid accountId)
+            => Connection.Table<AccountCalendar>().Where(x => x.AccountId == accountId).ToListAsync();
+
+        public async Task InsertAccountCalendarAsync(AccountCalendar accountCalendar)
+        {
+            await Connection.InsertAsync(accountCalendar);
+
+            WeakReferenceMessenger.Default.Send(new CalendarListAdded(accountCalendar));
+        }
+
+        public async Task UpdateAccountCalendarAsync(AccountCalendar accountCalendar)
+        {
+            await Connection.UpdateAsync(accountCalendar);
+
+            WeakReferenceMessenger.Default.Send(new CalendarListUpdated(accountCalendar));
+        }
+
+        public async Task DeleteAccountCalendarAsync(AccountCalendar accountCalendar)
+        {
+            var deleteCalendarItemsQuery = new Query()
+                .From(nameof(CalendarItem))
+                .Where(nameof(CalendarItem.CalendarId), accountCalendar.Id)
+                .Where(nameof(AccountCalendar.AccountId), accountCalendar.AccountId);
+
+            var rawQuery = deleteCalendarItemsQuery.GetRawQuery();
+
+            await Connection.ExecuteAsync(rawQuery);
+            await Connection.DeleteAsync(accountCalendar);
+
+            WeakReferenceMessenger.Default.Send(new CalendarListDeleted(accountCalendar));
+        }
+
+        public async Task DeleteCalendarItemAsync(Guid calendarItemId)
+        {
+            var calendarItem = await Connection.GetAsync<CalendarItem>(calendarItemId);
+
+            if (calendarItem == null) return;
+
+            await Connection.Table<CalendarItem>().DeleteAsync(x => x.Id == calendarItemId);
+
+            WeakReferenceMessenger.Default.Send(new CalendarItemDeleted(calendarItem));
+        }
+
+        public Task CreateNewCalendarItemAsync(CalendarItem calendarItem, List<CalendarEventAttendee> attendees)
+        {
+            return Connection.RunInTransactionAsync((conn) =>
+               {
+                   conn.Insert(calendarItem);
+                   conn.InsertAll(attendees);
+               });
+        }
+    }
+}
diff --git a/Wino.Services/ContactService.cs b/Wino.Services/ContactService.cs
index 1757983c..a2c0a07f 100644
--- a/Wino.Services/ContactService.cs
+++ b/Wino.Services/ContactService.cs
@@ -13,6 +13,15 @@ namespace Wino.Services
     {
         public ContactService(IDatabaseService databaseService) : base(databaseService) { }
 
+        public async Task<AccountContact> CreateNewContactAsync(string address, string displayName)
+        {
+            var contact = new AccountContact() { Address = address, Name = displayName };
+
+            await Connection.InsertAsync(contact).ConfigureAwait(false);
+
+            return contact;
+        }
+
         public Task<List<AccountContact>> GetAddressInformationAsync(string queryText)
         {
             if (queryText == null || queryText.Length < 2)
diff --git a/Wino.Services/DatabaseService.cs b/Wino.Services/DatabaseService.cs
index 68451bb0..ea0e4868 100644
--- a/Wino.Services/DatabaseService.cs
+++ b/Wino.Services/DatabaseService.cs
@@ -1,6 +1,7 @@
 using System.IO;
 using System.Threading.Tasks;
 using SQLite;
+using Wino.Core.Domain.Entities.Calendar;
 using Wino.Core.Domain.Entities.Mail;
 using Wino.Core.Domain.Entities.Shared;
 using Wino.Core.Domain.Interfaces;
@@ -52,7 +53,11 @@ namespace Wino.Services
                 typeof(AccountSignature),
                 typeof(MergedInbox),
                 typeof(MailAccountPreferences),
-                typeof(MailAccountAlias)
+                typeof(MailAccountAlias),
+                typeof(AccountCalendar),
+                typeof(CalendarEventAttendee),
+                typeof(CalendarItem),
+                typeof(Reminder)
                 );
         }
     }
diff --git a/Wino.Services/ServicesContainerSetup.cs b/Wino.Services/ServicesContainerSetup.cs
index bc09bf58..245a8a4f 100644
--- a/Wino.Services/ServicesContainerSetup.cs
+++ b/Wino.Services/ServicesContainerSetup.cs
@@ -16,6 +16,7 @@ namespace Wino.Services
             services.AddSingleton<ILaunchProtocolService, LaunchProtocolService>();
             services.AddSingleton<IMimeFileService, MimeFileService>();
 
+            services.AddTransient<ICalendarService, CalendarService>();
             services.AddTransient<IMailService, MailService>();
             services.AddTransient<IFolderService, FolderService>();
             services.AddTransient<IAccountService, AccountService>();