Microsoft Office 365 email account configured via IMAP (with basic authentication) no longer works. It keeps asking for a password and doesn’t accept it.

This behaviour is expected. As of 2024, Microsoft 365 no longer accepts basic authentication for IMAP (it can still be enabled for SMTP). To resolve the issue either use a native Exchange protocol or an IMAP email client that supports the modern OAuth authentication method (i.e. Thunderbird).

January 2024