diff --git a/BaseFilter/sections/adservers_firstparty.txt b/BaseFilter/sections/adservers_firstparty.txt
index 33443cc8489..2aac952fe25 100644
--- a/BaseFilter/sections/adservers_firstparty.txt
+++ b/BaseFilter/sections/adservers_firstparty.txt
@@ -7,6 +7,7 @@
 ! Bad: ||legitwebsite.com^$third-party (should be in adservers.txt)
 !
 !
+||outlookads.live.com^
 ||s.4cola.com^$third-party
 ||s.4tr.cc^$third-party
 ||d1o6lu9dr4t13s.cloudfront.net^