Why can't I delete mail or move mail to a folder. This started after mail host microsoft update to their exchange server
We recently moved our mail from an in-house server to an outside hosting service. It was working well until we returned after Christmas. The mail host explained that they had received a Microsoft update to their hosting servers. Now we get an "ERROR 12" code and cannot delete mail or move mail on any of the IMAP folders. I tested the theory on Outlook and the mail deleted fine and was able to move to folders and it synchronized without issue. How can we fix this on Thunderbird?
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Outlook connects to the server using emapi Thunderbird uses imap. So a comparison is nothing more than a waste, or did you explicitly set up an imap account in Outlook?
Please create an IMAP log https://wiki.mozilla.org/MailNews:Logging
I did find an old bug that indicates fasthost had incorrectly configured servers (is that your provider?) with a workaround.
It is difficult to diagnose exchange imap issues because they do not use any of the standard error codes or messages. But a log should at least provide information on the command the server does not like and that makes a good starting point.
Yes I did set up outlook with IMAP settings. No that isn't the mail host. However, I was told that this is likely due to a recent Microsoft update to mail Exchange servers. Not sure if this is the case.