Question : Problem: Can't get blackberry to sync back to exchange through BES.

My BlackBerry is set up on the BES (BlackBerry Enterprise Server). If a calendar appointment is created on my Exchange mailbox calendar, it immediately shows up on the BlackBerry. If I creates a calendar appointment on the BlackBerry itself, it will not appear in Exchange, and a warning will be logged in the application log. Where do I start looking? Server side or phone side...and then what?

Answer : Problem: Can't get blackberry to sync back to exchange through BES.

Or, a simpler thing to try first: resend the service books to your device.