If you’re wondering why I use the Get-Mailbox | Set-Mailbox construction…. The Arbitration Mailboxes are up and running again, you can check using the Get-Mailbox –Arbitration command: The user accounts are now created again, and the next step is to Mail-Enable them: Enable-Mailbox –Arbitration –Identity "FederatedEmail.4c1f4d8b-8179-4148-93bf-00a95fa1e042"Įnable-Mailbox –Arbitration –Identity "SystemMailbox | Set-Mailbox –Arbitration –ProhibitSendQuota 1MB Once removed, you have to run the Setup.exe /PrepareAD /IAcceptExchangeServerLicenseTerms command again (from the correct installation media by the way) to recreate the Arbitration Mailboxes: When the user accounts are deleted you can run the Get-Mailbox –Arbitration command again to see if they are really removed. To recreate the Arbitration Mailboxes we first have to remove everything the accompanying user accounts, which can be found in CN=Users in Active Directory: This was clearly visible when running a Get-Mailbox –Arbitration command: The accompanying user accounts were still available in Active Directory, but mandatory properties were incorrect. While testing with Exchange 2013 CU9 in our lab environment we utterly destroyed the DAG and after recreating the DAG and the Mailbox databases we found that the Arbitration Mailboxes were in a corrupt state.
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