Perhaps it is not related but it appears that old calendar events within Oulook are missing from the Calendar since users have been syncing their data with their iPhone. Reoccuring events appear to be ok but all other old events are gone.
I did some research and it does appear that this might be sync related. If it is sync related is there a way on an iPhone to configure the sync so that old calendar events are kept forever?
If it is not sync related then what other reasons would old calendar events be removed from a users Outlook? Bear in mind, that we disable archiving in Outlook for all users.