Unable to subscribe to Office 365 IMAP folders from MUA since 2022-11-01

Anonymous
2022-11-02T07:33:01+00:00

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 and Office | Subscription, account, billing | For business | Other

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  1. Anonymous
    2022-11-17T19:01:24+00:00

    As mentioned already above, Gnome Evolution (3.38.3-1) does not have such a workaround. If 'Show only subscribed folders' is selected then you have no folder at all otherwise you get just the folders 'Inbox', 'Junk' and 'Wastebasket' but no other existing folders.

    However, independent of the selection you get mostly an error message: Error while Retrieving folder list for “your@email...”: Error fetching subscribed folders: LSUB failed on nearly every update.

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  2. Anonymous
    2022-11-17T17:14:21+00:00

    Just out of curiosity, what are the mail client(s) that don't have the workaround of being able to display all folders? I'll happily feed that back on my ticket open with Microsoft as they need to know that the workaround might not be working for everyone. Thanks.

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  3. Anonymous
    2022-11-17T09:24:31+00:00

    We are experiencing this same problem at one of our clients.

    Trying to retrieve the subscribed mail folders or subscribing a folder doesn't work.

    This problem shows on both auth methods (basic auth & modern auth (oath2)).

    Some of the mail clients like Thunderbird have a workaround, where you can choose to load all folder and not only the one subscribed to but some mail clients do not work like that.

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  4. Anonymous
    2022-11-16T03:08:10+00:00

    Nor me either.

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  5. Anonymous
    2022-11-15T21:31:17+00:00

    Nor me unfortunately.

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