When I start Thunderbird (31.2.0 under Ubuntu 14.04), my Outlook 365 account
email@example.com accessed over IMAP is completely unreachable (I can't even see the list of folders, even though I have local archives). I see the following message in a D-Bus notification (several times):
The current operation on 'Inbox' did not succeed. The mail server for account firstname.lastname@example.org responded: User is authenticated but not connected.
This account has been working for a while. I changed my password during my previous Thunderbird session; after entering the new password, Thunderbird still worked.
What does this seemingly nonsensical message “User is authenticated but not connected” mean? How do I get my email?