So far regarding this problem:
- reindexing mailbox does not have any influence
- installing Outlook on fresh machine from scratch neither
- upgradng Zimbra to latest ZCS also no avail
- it is definitelly Zimbra messing arround with IMAP UID at some point
So, my question:
Is it possible somehow to find, which message coresponds to certain IMAP UID number? So I could pinpoint the problematic message, remove it and see what it does with the problem.