Re: misbehaving outlook 2024, append/expunge loop

I have seen something similar, and fixed it by telling the user in 
question to empty his Trash folder, compact folders, and restart Outlook.

I've also seen something similar where Outlook's spam filter was 
attempting to delete messages from a read-only shared folder that they 
weren't subscribed to (thanks Outlook). As a result, Outlook repeatedly 
copied the messages from the shared folder to the spam folder. I added 
the sending domain (it was internal messages only) to a whitelist in 
Outlook somewhere and it stopped.

That doesn't help much if you don't have control over your users' 
Outlook settings though.

Mark


On 2026-01-16 17:25, quoth Wolfgang Breyha via Info:
> Hi!
> 
> Since I have my doubts that M$ will fix this any time soon I want to ask it
> here.
> 
> I see a lot of Outlook 2024 clients (eg. imap id "version"
> "16.0.19426.20218","16.0.19530.20074",...) in my logs which enter an
> infinite "append/expunge" loop for the same message. Only stopped by ending
> Outlook or the frontend process of cyrus.
> 
> If it is a rather large message our spools are getting out of disk space
> quite fast (over night) if the connection is fast.
> 
> Until today we recognized it because of "out of disc space" about once a
> month. But today I wrote a short script to scan our logs for this issue and
> I see about 20-50 misbehaving sessions a day with loop counts up to 45k
> append/expunge for the same message. Only undetected yet because of small
> message sizes.
> 
> This occurs on our cyrus 3.8.6 classic murder setup.
> 
> Can somebody confirm this?
> 
> I'm currently not sure how to handle/prevent this besides killing those
> sessions.
> 
> Greetings,
> Wolfgang


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