Move mailbox requests in exchange 2010 and corrupted items

I'm trying to move a bunch of mailboxes from one database to another. I wanted to know if its possible to have more than 2 running at once? or is that a limit of exchange 2010? I am trying to speed up the process of moving a bunch of mailboxes at once and wanted to know if its possible to get more than 2 started simultaneously, and if so, how i can do this?

Also, i notice a few of my mailboxes have corrupted items. Is there a way to determine which messages were actually corrupted in the mailbox? This way i can pull them up and determine whether or not they were important without having to go through all my e-mails?
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You can make it move 5 at a time if you want:

Network bandwidth may be a factor at some point.
How do you know they have corrupted items? Has a move failed for them already?
You can have 100 concurrent moves at a time, but I would think that you would have a significant performance impact with that setting:

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When your moves are complete and you are just left with the "corrupt" mailboxes on the source DB you can take down the DB and run isinteg -fix -test alltests on it to fix any logical corruptions, you should then be able to move all those mailboxes without having to worry about corrupt items anymore.
Apparently the move report should give you more detail:

$MoveReport = (Get-MailboxStatistics –Identity ‘Redmond, Tony’ –IncludeMoveReport).MoveHistory

But whether that will show which items are corrupt, I don't know...

That EMS command is from here:
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