If you can go into the Zimbra web client and see your 5500 emails, they're on the server, so deleting and reinstalling the connector won't cause any trouble.
Before deleting and reinstalling ZCO though, you could try creating a brand new Outlook (Zimbra) profile. When you fire up that profile, it will do an initial sync (one way) from Zimbra to Outlook, so it shouldn't be deleting anything.
Of course you may want to back things up as a matter of course.
A couple of questions:
1) Can you remember anything that happened (new version, new addin, etc.) that happened in the last month to cause your change in behavior?
2) What version of ZCO and the Zimbra server are you using?
If you still have the problem, enable ZCO logging (HTTP on and verbose off), make a change in Outlook, sync to the server, exit Outlook, and capture the log. |