I truly believe this is an issue with EMC as I can connect with other email clients like Windows Mail, Bluemail, etc. with no problems (I tested it)
This is not an eM Client issue as it works perfectly for me personally and many other eM Client Outlook mailbox customers (with the same IMAP settings as @Ekalb example screenshot above (via the automatic wizard) setup with V8 eM Client.
I suspect it’s still a Microsoft (server specific mailbox connection problem) somewhere as per your other thread and I would still contact Microsoft via phone or forums, email etc.