A colleague of mine complained today that some changes he made to appointments in a calendar shared by our superior have disappeared. He changed the titles and appended a pdf file to the entries.
I'm wondering if there's a way to log all changes to calendar entries to a log file. This should include who made the change, the kind of change (add, change, delete) and to what entry. This would allow me to at least check if someone else did the changes or if there was a problem with zimbra itself.