Even here was many times reported, that outlook has bug, which prevents users from using: leave message on pop3 server functionality. The problem seems be really related to length of UID of message. Occures on maiboxes, where are messages with mixed length, like: 1. 10. or 10. 100. It can be probably fixed on cyrus side. I have one idea, how to fix it and not break current mailboxes by changing UID format. If cyrus will in every NEW mailbox start with messages number 1000000., there will be possible to deliver 9000000 messages without changing the length of UID. Is it good idea? Will be possible to insert new configuration parametr like first_uid and fix the problem this way? cheers dan ---- Cyrus Home Page: http://cyrusimap.web.cmu.edu/ Cyrus Wiki/FAQ: http://cyrusimap.web.cmu.edu/twiki List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html