Exchange 2010 SP1: How to delete the First (or last) database and move the system mailboxes

When you try to delete the Default Mailbox Database (created with 1st installation of the Mailbox Role), you receive the error below

“This mailbox database contains one or more mailboxes or arbitration mailboxes. Before you can remove this mailbox database, you must disable, move or remove user mailboxes and move arbitration mailboxes.”

Why?

The First database contains the SystemMailboxes which are the Arbitration mailbox(es).

We have to move these system mailboxes to another database before of remove the Default Database.

1. Find the Arbitration Mailbox with EMS

Get-Mailbox -Arbitration |  Where {$_.Name -like "SystemMailbox*" } | ft –wrap

2. Now have to create a new move request

New-MoveRequest -Identity "SystemMailbox{1f05a927-32d1-4e19-8ea5-67eba859f541-yourGUID}" -TargetDatabase "dbxxxx"   

3. Verify if the move request was done

Get-MoveRequest

4. Remove the request

Remove-MoveRequest -Identity "the name of the request like Microsoft Exchange Approval Assistant"