OK even stranger now!

I've set up two IMAP accounts on my MacBook Pro running OS Sierra. In the accounts section of Preferences they are both shown with yellow dots indicating that the server has not been correctly set up?

One of the accounts shows in the left hand pane of Outlook (with 3 Archive and 3 Junk folders?) whereas the other account isn't there at all. Both accounts are on the same email server and have been set up with the ports 993 for in and 465 for out.

Is there a problem with the recent 15.31 version of Outlook that I am running, it was distributed on the 17th February? Is it possible to roll back to the previous version?