I am working this migration and had some problems with the final step of removing exchange (no media and partial manual removal). This resulted in some DNS entries for the old server on the new box that MS helped me clean up. My biggest issue right now is I need to disconnect the old server from the network to finish up and get all my clients squared away but if it's not connected and I reboot the new server it goes into an endless boot sequence loop - it appears that something (netlogon?) is looking to the old server and if it can't find it - no dice.
Related problems include inability to publish new GPOs to clients (shares and printers) and client document redirection is not working correctly.
Many thanks in advance.