KB5018410 Problem with Outlook. Constantly asking for password.

Copper Contributor

Once (KB5018410) is installed in Windows 10 Outlook 2019 version 16.0.10390.20024 or Outlook 2016 constantly asking for a mailbox password regardless if password is saved. 


Once this update was removed and the system restarted the problem went away.


Unfortunately, KB5020435 has not resolved that issue.


Mail server: Exchange 2010.

1 Reply


Exact same Problem here with KB5018410 and again with KB5019959. No clue whats the cause of these Outlook Problems. 

Also users can't access shared calendar from other users.