This is a scenario
Company ABC has 2 domain controllers
First DC: Windows 2000 Server has 40 users account
Second DC: Windows 2003 Server + Exchange 2003, has 40 users account
All 80 users are using mail by Exchange 2003, on second DC.
Company ABC wants to deploy new Server 2008 R2 with Exchange 2010, they want all users use Exchange 2010 from now on. All the users from first DC will be moved to second DC.
I would like to ask all experts give me best detail solutions for this scenario. Thank you very much.