It took about 4 minutes to do it all for 5 users. This is what I've done and used:
1. Install BlackBerry Enterprise Server User Administration Tool v5.0.0 Maintenance Release 1 for Microsoft® Exchange from here
BlackBerry - Enterprise Server Resource Kit
2. Install BlackBerry Enterprise Transporter v5.0.0 Maintenance Release 1 from here
BlackBerry - Enterprise Server Resource Kit
Above to be installed on admin workstation and not on either server. (BRK is not to be run on BES servers.)
I logged on as BESAdmin account to a workstation but you can RunAs Besadmin.
Close all other BB apps.
(Prepare destination server/database with IT policies or move users to a Default IT Policy.)
Run transporter tool.