We are using a hosted Exchange service. Our primary interest is shared calendars across 2 locations. All was well until we upgraded one location to Outlook 2010 from 2003. Now appointments which are dragged and dropped to another time will snap back to where they were after a few seconds (along with several other anomalies). This happens even if only 1 location has Outlook up and running. We upgraded the other location also, but that didn't help. Has anyone noticed incompatibilities in this regard?