Move the Exchange 2010/13/16 System Mailbox

Move the Exchange 2010/13/16 System Mailbox to new Database Store 

1. First we need to get the details of the system mailbox and the databases, run the below commands to get the information:

Get-Mailbox -Arbitration | FL Name,DisplayName,ServerName,Database,AdminDisplayVersion

Get-MailboxDatabase -IncludePreExchange2013 | FL Name,Server,AdminDisplayVersion

2. Once we get all the details, we need to move the System mailbox using the below command:

Get-Mailbox -Arbitration -Identity "SystemMailbox{e0dc1c29-89c3-4034-b678-e6c29d823ed9}" | New-MoveRequest -TargetDatabase NEWDatabase

3. Check

Get-Mailbox -Arbitration | FL Name,DisplayName,ServerName,Database,AdminDisplayVersion