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Step by Step Directions for Techs

Exchange mailbox migrations moving at the speed of… well… not fast.

Migrating between Exchange 2007 and 2013 or Exchange 2010 and 2013?  Mailbox migration speeds can be unbearably slow.

Exchange 2013 (as well as older versions, including 2010) changed the number of concurrent mailbox moves to 2…  let’s change that to 5.  Beware of setting it too high as it could have a serious impact on the Exchange infrastructure.

  1. Pause migration jobs
  2. Open Notepad as an Administrator.
  3. Open Microsoft\Exchange Server\V15\Bin\MsExchangeMailboxReplication.exe.config
  4. Find “MaxActiveMovesPerTargetMDB
    Note, the setting appears twice.  The first time it is commented out with <!–  and –>.  Make sure you get the right setting!!!
  5. Change value from 2 to 5
  6. Save the config file
  7. Restart Microsoft Exchange Replication service (MSExchangeRepl)

This change has to be done on all the front end servers.  You should see that it will now migrate 5 mailboxes simultaneously.   You can also speed things up by migrating to multiple data stores simultaneously.  Some caution is needed when trying to max your migration speed as you can pretty easily overrun the storage (especially if it is local).

Good luck!

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One response to “Exchange mailbox migrations moving at the speed of… well… not fast.

  1. MikeyRod May 13, 2013 at 1:33 pm

    Hi, thanks for the info. I’m doing my first Exchange 2013 CU1 migration from Exchange 2007 SP3 CU10 and upon modifying the MSExchangeMailboxReplication.exe.config, my MaxActiveMovesPerTargetMDB was already set to “20”.

    I’m not sure if that’s the new default with Exchange 2013 CU1, but I just wanted to share my experience.

    Thanks for the info!

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