Server admin needs to reset your BES account on the BES server and you will need to redo your enterprise activation from your blackberry handheld.

Let the device go through the entire activation..it can take awhile..even over an hour depending on how much data your exchange server needs to synch with your Blackberry and visa vera. When it is done you will get and activation complete message on the blackberry.

Then check for the wireless synch options under each PIM item on your blackberry. Make sure they are set to "YES" and you should be all set.

Also -you will want to configure desktop manager NOT to do the intellisynch when the device is plugged into the computer or take it out of your start-up folder in windows. You only really need it update software on the Blackberry once you port to 4.0