Exchange 2010 is shining in many areas, performance is one of the first noticeable changes and mailbox move has some improvements in Exchange 2010.
I believe most common scenario will be moving mailboxes from Exchange 2003 to Exchange 2010. If you heart about online mailboxes and excited about it this wont work for those who are migration from 03 to 2010 simply the future does not apply to Exchange previous versions except Exchange 2007 SP2 or higher
In an online mailbox move, the mailbox is moved while the end-users can still access their e-mail accounts and the account only locks out the user for a very brief time during the end of the process when the final synchronization occurs. Online mailbox moves are only supported between Exchange 2010 databases, and between Exchange 2007 SP2 and Exchange 2010 databases. You can perform an online mailbox move across forests or in the same forest. Read more
- You can't use the Exchange System Manager or Active Directory Users and Computers to move mailboxes from Exchange 2003 to Exchange 2010.
- You can't use the Move-Mailbox cmdlets in Exchange 2007 to move mailboxes from Exchange 2007 to Exchange 2010.
- When you move mailboxes, the user will lose the ability to view their message tracking information
The move process is performed offline, and end-users won't be able to access their mailboxes during the move
Perform the move from a server running Exchange 2010 by using the move request cmdlets in the Exchange Management Shell. You can't use Exchange System Manager on an Exchange 2003 server to move the mailboxes.
If you need to upgrade from Exchange 2003 to Exchange 2010 try ESDA * deployment assistant here
- Exchange still moves mailbox in patch of four ( four move treats at one time).
- New Move request in Exchange 2010 makes perfect sense to keep track who is being moved and ability to get quick report is making the move process even more efficient.