That's how Outlook on Mac already works. It forces "New Outlook" every time there's an update, and you can't avoid the switch. Worse, even when you switch back

That's how Outlook on Mac already works. It forces "New Outlook" every time there's an update, and you can't avoid the switch. Worse, even when you switch back to "Old Outlook" it used to mess with your settings. If this is now simply a way to refresh the snagged IMAP credentials so they can ready your email, then it explains a few things.