Using Outlook for Android in business environments for email and scheduling
I can confirm this. If you see "messages and calendars are updating" you are screwed. For me the "quickest" way to "recover" from this is to do the following:
- Delete the IMAP account.
- Force close Outlook.
- Open Outlook.
- Add the IMAP account again, being careful to not use a port for the IMAP server, but do use a port for the SMTP server.