How to increase the maximum simultaneous move-requests in Exchange Server 2010

As of Exchange Server 2010 we no longer have the ability to use the cmd-let Move-Mailbox and specify the -Maxthread ability to change how many mailboxes to move simultaneous.

In Exchange Server 2010 we now use New-MoveRequest and default it moves 5 mailboxes at the same time. For 1500 mailboxes it could take days.

To change the maximum number of simultaneous moves we must on every CAS server edit the file:

MSExchangeMailboxReplication.exe.config

Under the MRSConfiguration section change these fields into a desired value:

MaxActiveMovesPerSourceMDB = "25"
MaxActiveMovesPerTargetMDB = "25"
MaxActiveMovesPerSourceServer = "50"
MaxActiveMovesPerTargetServer = "25"
MaxTotalMovesPerMRS = "100"

Now we must restart the Microsoft Exchange Mailbox Replication Service.
From Powershell:

restart-service MSExchangeMailboxReplication

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