You’ve completed the initial part of the Exchange 2010 migration and have now come to the point were you need to start moving mailboxes. You start to move the mailboxes but they seem to be taking ages to move. If you look under your move request tab you will see that only 2 mailboxes are moving at a time. I think the reason Microsoft limits this to 2 is because Exchange was configured so you can move the mailboxes during business hours with hardly any interference to the users.
Like most of us thou we move mailboxes outside of office hours so we would like to speed up the process.
Below is the steps to increase how many simultaneous mailboxes can move at any one time.
1. Edit the following file: C:\Program Files\Microsoft\Exchange Server\V14\Bin\MsExchangeMailboxReplication.exe.xml using Notepad.
2. Increase the “MaxActiveMovesPerSourceMDB” from 2 to your desired number. I have found 5 to be a good starting point. Make sure you do this under MRSConfiguration section not the section above it.
3. Restart the Microsoft Exchange Replication Service and restart the Mailbox Move.
This should resolve the slow move. I have found that this makes a massive difference from taking 2 days to move a certain amount of mailbox to only 8 hours.