OK, here's a weird one and I'm not sure if it's Zimbra's problem or Mozilla's:

I have a bunch of clients using Tbird as their IMAP client. They have varying quotas on their IMAP folders, and as is not unusual, once in a while somebody's folder starts getting full. When that happens, they get a little note from my "Your box is getting full, better clean house" script.

I haven't nailed down just what the threshold is, but at something around 87% and up, if they try to delete an offending humongous message (usually with the latest funny video), the Thunderbird client pops up an error "The current command did not succeed. The mail server responded: UID COPY failed" and refuses to delete the message.

I just tried a test of this, and when I logged into the webmail client I was able to delete the message without error.

Any clue what's going on here or what I can do about it (besides shutting down permissions for wmv attachments)?

Thanks in advance,