Be prepared for a change to Email Link authentication
A note for those of you who use the CM Email Link model to connect to Exchange Online (O365).
As of October 2020 Microsoft are removing support for basic authentication to Exchange Online. As at CM 9.4 the only way to authenticate with Exchange Online is basic authentication. I expect 9.4 Patch 1 to support OAuth authentication.
So, if you use EmailLink to connect to Exchange Online an upgrade to 9.4 P1 sometime in the next year might be a good idea.
For those who like pictures this is a preview of the Auth options in Email Link.
NOTE: This is a reference to things that may or may not happen in the future so please recite all the usual caveats regarding future referencing statements.