Just curious. Is there some tool that will run outside of outlook, examines the zimbra.zdb file and makes sure it is in sync with the server, like the PST import tool it could perform that task on the zdb file.
I have several users using outlook and for some reason or the other, some have mail on their outlook that is not seen in the webinterface. Short of exporting the whole data and then using pst import wizard there should be a zdb import wizard.
I tested the export to pst file and then use the import wizard. Even so I specified NOT to import duplicates. I ended up with duplicate emails