How to find and move the Exchange Arbitration Mailboxes
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			The Exchange System (Arbitration) Mailboxes, like 'Discovery Search' are created on the first Exchange server installed in the organization.  If you need to remove a database or uninstall Exchange you will need to move the arbitration mailboxes to a different database or different server, respectively.
Command to search all databases for the arbitration mailboxes:
get-mailboxdatabase | Get-Mailbox -Arbitration |ft name,database,servername
Here is the command to determine if arbitration mailboxes Read more [...]