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

Anonymous

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.

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106 answers

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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