Dear community For years am I using Thunderbird to work with an O365-school account. After the last fix in autumn in the settings due to the "OAuth2"-issue, Thunderbird was working seamlessly until 26th of december. Thanks a lot for all your work. But now, still after numerous tries and searches through the net, I'm not able to download mails anymore from my account. Sending mails via smtp works, but even a fresh installation with the most recent Thunderbird version hasn't showed the desired effect. The following points about my system: - Thunderbird 102.4.2 on Ubuntu 20.04.5 LTS from official archives (tried it also with version 102.6.0 as ubuntu-snap) - Set up the Office365 from scratch with the automatic configuration (incl. permission online for Thunderbird) - SMTP connection and sending mails is ok - IMAP connects for download, no error messages but the inbox simply stays empty. The additional folders, that are visible online, aren't downloaded at all. Any advice would be highly appreciated. Best regards Martin