Step by Step Directions for Techs
Exchange mailbox migrations moving at the speed of… well… not fast.
February 18, 2013Posted by on
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.
- Pause migration jobs
- Open Notepad as an Administrator.
- Open Microsoft\Exchange Server\V15\Bin\MsExchangeMailboxReplication.exe.config
- Find “MaxActiveMovesPerTargetMDB”
Note, the setting appears twice. The first time it is commented out with <!– and –>. Make sure you get the right setting!!!
- Change value from 2 to 5
- Save the config file
- 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).