Cannot Uninstall Exchange 2010 Because of Arbitration Mailboxes

To list the arbitration mailboxes type the following command:

[PS] Get-Mailbox –Database database name  -Arbitration

This will list all the mailboxes that can be moved or removed.

To move them to another database, type the following command:

[PS] Get-Mailbox -Arbitration -Database db1 | New-MoveRequest -TargetDatabase db2

To remove the mailboxes, type the following command:

[PS] Get-Mailbox -Arbitration -Database db1 | Remove-Mailbox -Arbitration –RemoveLastArbitrationMailboxAllowed

Once you do this hopefully you should be able to uninstall Exchange using the Control panel