I have 20 users in the office that are mostly on Curve 8310, bes and exchange is hosted by another company. We finally got most of our BB issues resolved except for 1. When users create calendar items on the bb, it doesnt show up on their calendar. Any advise would be greatly appreciated.

Try this thread for starters, although I would think that a hosted service would have a proper setup.

http://www.blackberryforums.com/rim-...s-outlook.html

You would think the hosting company would be on top of this. I am having alot of trouble getting our users setup properly, taking days to get users setup for one reason or another. SHAADY COMPANY!!

Well, you don't know that this is the issue or not -- but it does seem to match your symptoms. Perhaps call their attention to the link that I posted.