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I'm using Thunderbird to access my Office 365 mail account and it has been working fine (a couple of month ago I also switched to OAuth2 due to deprecation of basic IMAP authentication). However, since 2022-11-01, Thunderbird is unable to subscribe to IMAP folders. Last time I know it was working was last Friday 2022-10-28. Thunderbird is able to list to available folders (e.g. when opening the "Subscribe" dialog from the mail account settings), but cannot subscribe to them. I enabled IMAP logging in Thunderbird, and it shows that the server answer the subscribe request with "BAD SUBSCRIBE".
It is not a password/authentication issue, as Thunderbird can still see the content of "Inbox" and "Deleted Items". And if I disable the option "Show only subscribed folders", it can access everything in my Office 265 account.
Edit: here's the relevant logs from Thunderbird (note: I've replaced the actual folder name with "xxxx"):
[Parent ...: IMAP]: I/IMAP ...:outlook.office365.com:A:SendData: 76 subscribe "INBOX/xxxx"
[Parent ...: IMAP]: I/IMAP ...:outlook.office365.com:A:CreateNewLineFromSocket: 76 BAD SUBSCRIBE failed.
Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
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Also seeing this, Inbox and trash are the only visible folders when the show only subscribed folders option is activated. Trying to subscribe to other folders fails. Seeing this on my academic institution email service.
I am having the same issue on one Office 365 account so far, but fear it will start happening to others. If I show all folders instead of only subscribed, it still works as others noted. But I don't want to see all folders.
Would love to hear if anyone finds a solution to this.
Thanks to Michael for posting your findings. It sounds exactly like what I am seeing.
I have my account setup in Tbird w/IMAP (have for years) on serveral systems, and same thing, though it started a week ago on one laptop, hit the other a couple days later, then finally my desktop yesterday. Inbox and Deleted are the only folders displayed no matter what I try.
Hi,
Just to confirm, the issue is not just with Thunderbird, but also with Gnome evolution,
with the error message: Error fetching subscribed folders: LSUB failed.
So it seems to be definitely not the MUA.
I'm having the same problem with 2 out of 3 email accounts. All three accounts are the same domain. One of them works with subscribe to folders under Thunderbird and the other two don't. I've tried these with Thunderbird on Linux and Windows PCs and in every case the one account works as expected and the other two don't I've attempted to find something different in the accounts but with the visibility I have can't find anything. All three accounts were working properly until around the 1st of November. I actually had one of the folders open and looking at the contents when it just evaporated before my eyes.