One of our users has been using the .Mac/Mobile Me sync thing. Then he installed the Zimbra iSync connector.

After installation of the Zimbra iSync connector, all seems well.

Connection OK, authenticated, syncs, but no data is transferred in any direction.

Sync is extremely fast, and no contacts or calendar entries are synced from the computer to the server and vice versa. No error reports. The iCal calendar account is created, but it shows no calendars.

Any ideas?

This is very critical...