When you have a new installation of Exchange 2010 Server and you want to move all mailboxes, including all hidden Mailboxen (Arbitration) from the default database store to a database that you created. Here is how i did it.
When you try to delete the default database you will get this message:
The Database is not empty, even though it does look empty if you do a get-mailbox for the specific database:
get-mailbox -Database “Mailbox Database 1905367170”
There is a switch that you should use if you want to see all mailboxes, even the “hidden” Arbitration mailboxes:
get-mailbox -Database “Mailbox Database 1905367170” –Arbitration
This gives a different result.
As you can se the database is n’t as empty as we first thought. To move these mailboxes to the new database you can easily pipe the result of the get-mailbox command and create new move requests for all Arbitration mailboxes:
get-mailbox -Database “Mailbox Database 1905367170” -Arbitration | New-MoveRequest –TargetDatabase “MailboxDatabase1”
Source: msundis.wordpress.com