Handy powershell command for moving mailboxes from Exchange 2007 or below to Exchange 2010.
Get-MoveRequest | Get-MoveRequestStatistics | fl MailboxIdentity, PercentComplete, TotalMailboxsize, BytesTransferred, BytesTransferredPerMinute, BadItemsEncountered, Message
Get-MoveRequestStatistics -Identity "Luke Smith" | fl
I would to credit Daniel Dickinson for discoving the powershell command.