If you haven’t played much with Exchange 2010 in your own lab, then these guided labs are highly recommended.
Configuring Exchange Server 2010 Unified Messaging and OCS 2007 R2 Integration Virtual Lab:
http://go.microsoft.com/?linkid=9672532
Transitioning from Exchange Server 2007 to Exchange Server 2010 (Beta) Virtual Lab:
http://go.microsoft.com/?linkid=9670971
Exchange Server 2010 (Beta) HA and Storage Scenarios Virtual Lab:
http://go.microsoft.com/?linkid=9670970
Configuring Exchange Server 2010 Unified Messaging Virtual Lab:
http://go.microsoft.com/?linkid=9670969
Exchange Server 2010 (Beta) Setup and Deployment Virtual Lab:
http://go.microsoft.com/?linkid=9670799
Cheers,
Henrik Walther
Technology Architect/Writer
MCM: Exchange 2007 | MVP: Exchange Architecture