Hello list, Last week, I switched to using OAuth2 (aka "Modern Authentication") from Thunderbird to access my company's Office365 mailbox over IMAP. Everything went swell for 2 days. Over the week-end, I applied the (Leap 15.3) online update for Thunderbird (to v102.4.0), and this morning all my server-side folders were gone. The Inbox itself could still be accessed, and the local folders have no issue. I then reverted to the earlier version of TB (v102.2.2), and after some fiddling, I could get some of the server-side folders to reappear and to resynch, but: - even though the messages are listed in those folders, the message contents won't display if I select one of them (status says "loading") forever - sent messages aren't copied to the "sent items" folder -- there as well, it waits forever Has anyone else here been confronted with a similar behaviour? TIA Ph. A. -- *Philippe Andersson* Unix System Administrator IBA Particle Therapy | Tel: +32-10-475.983 Fax: +32-10-487.707 eMail: pan@iba-group.com <http://www.iba-worldwide.com> Disclaimer | Use of IBA e-communication<https://iba-worldwide.com/disclaimer> The contents of this e-mail message and any attachments are intended solely for the recipient (s) named above. This communication is intended to be and to remain confidential and may be protected by intellectual property rights. Any use of the information contained herein (including but not limited to, total or partial reproduction, communication or distribution of any form) by persons other than the designated recipient(s) is prohibited. Please notify the sender immediately by e-mail if you have received this e-mail by mistake and delete this e-mail from your system. E-mail transmission cannot be guaranteed to be secure or error-free. Ion Beam Applications does not accept liability for any such errors. Thank you for your cooperation.