Ok, it was a permissions thing. While the inherited settings copied themselves over, send as, receive as, and administer information store permissions did not. I added those to the besadmin account in the security tab of the server in the system manager and all is well for sending and receiving. I guess I don't have to worry about updating our BES server for a while. I think I'll wait until BES 5.0 and then create a whole new server on better hardware.
One last question. Does the BES use AD to know which server a particular user is on? Our concern is when we turn off the old exchange server the BES knows what to do and where to go. After some reading BlackBerry Application Error
it seems my only concern is when I move the besadmin mailbox. Just follow the steps onlined in the link and I should be good. Correct?