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
    2023-01-31T10:27:42+00:00

    I got a phone call on monday 23rd acknowledging that they are working on a fix but witout ETA, then got another call at the end of the week that the fix has been rolled out. I asked our affected yours for feedback and got feedback that the issue has been addressed on their end as well. I worked with Microsoft support to confirm the issue with subscribing wasn't just a Thunderbird-specific issue by using the PopImap PowerShell to subscribe to an IMAP folder and were able to reproduce the issue with that module to.

    It seems the pressure from many finally resulted in Microsoft prioritize this issue and roll out a fix, finally :-)

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  2. Anonymous
    2022-11-07T22:32:00+00:00

    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.

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  3. Anonymous
    2022-11-07T13:49:09+00:00

    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.

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  4. Anonymous
    2022-11-06T17:26:58+00:00

    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.

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  5. Anonymous
    2022-11-02T11:29:27+00:00

    Dear Michael,

    Good day!

    Thank you for posting to Microsoft Community. We are happy to help you.

    Based on your description, I understand that you have a concern with "Unable to subscribe to Office 365 IMAP folders from MUA" At this very moment, I am looking into whether there could be a possible solution to this issue. I will get back to you as soon as I get any additional information about your query.

    Your patience and cooperation are much appreciated.

    Sincerely,

    Ashraf | Microsoft Community Moderator

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