If you remove the battery, you shouldn't lose the service books. If you do, you can reregister on the host routing table and/or go to your BIS website and resend from there.
As for moving to Exchange 2010, that might be the issue, but I am not an exchanger guru. Perhaps one of our BES Admins will be along to help out.
And "hat do you mean pls Talked to the Exchange server host" I mean talked to whomever is hosting the exchange server.