Speeding Up Exchange 2010 Mailbox Moves

Performing Mailbox moves in Exchange 2010 can be a rather slow process, moving at 3-4GB an hour. If you’re migrating a large store this is a long period of time to wait. Here’s how you can speed up the process significantly. I’ve used these settings on several SBS 2003 to 2011 swing migrations including from a 2003 swing server running in Hyper-V on a SATA drive. If you’re moving from something beefier than that I would suggest bumping up the MaxActiveMoves settings accordingly.

On the server you’re migrating to edit MSExchangeMailboxReplication.exe.config located in your Exchange bin folder (by default: c:\Program Files\Microsoft\Exchange Server\V14\Bin)

Find the following default values:

MaxActiveMovesPerSourceMDB = “5″   
MaxActiveMovesPerTargetMDB = “2″   
MaxActiveMovesPerSourceServer = “50″   
MaxActiveMovesPerTargetServer = “5″   
MaxTotalMovesPerMRS = “100″

Change them to:

MaxActiveMovesPerSourceMDB = “7″   
MaxActiveMovesPerTargetMDB = “7″   
MaxActiveMovesPerSourceServer = “50″   
MaxActiveMovesPerTargetServer = “40″   
MaxTotalMovesPerMRS = “250″

Restart Microsoft Exchange Replication Service


  1. Nice work, helped me out big time..

  2. Fantastic thanks this REALLY helped with my 80 mailboxes (220GB store!)


  3. Thanks for the information. You have saved me hours!!!!

  4. Can you suspend the move make the changes and restart the service and continue and existing move?

  5. Good Work , it works beautifully!!

    Adding the Suspend and Resume commands in the same article would help many people.

  6. Thanks for the advise,

    Moving a 500+GB Exchange server with 1,5 million items. Interesting to see if this makes a difference :)

    • Dustin

      June 25, 2015 at 4:48 pm

      I’ve not used these settings on a mailbox store this large. However, as long as the source database and server are in decent shape, you should see a definite increase in the speed.

  7. Any idea if this will work with Exchange 2013? I have to migrate a SBS 2008 to Server 2012R2 w Ex 2013 and this would be nice. It definitely helped all my SBS 2011 migrations.

    Thanks so much!


    • Dustin

      August 7, 2015 at 11:03 pm

      Yes, this will work for Exchange 2013. Only difference is the folder is V15 instead of V14 in the path.

  8. Thanks Dustin. This is the default for my Exchange 2013 installation, I just need to change the last entry.


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