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Microsoft Exchange 2013/2016 Recreate Arbitration Mailboxes

After migrating to Exchange 2016 on Premises I was receiving errors in Event Log regarding the Arbitration Mailboxes. I decided to re-create these mailboxes to avoid any issues in the future.

You can view the Exchange Arbitration Mailboxes by using Get-Mailbox –Arbitration.

Get Mailboxes Arbitration - Microsoft Exchange 2013/2016 Recreate Arbitration Mailboxes

To recreate the mailboxes we need to initially remove the User Accounts in Active Directory. These will usually be found in CN=Users Unless they have been moved.

Arbitration Mailboxes 1024x554 - Microsoft Exchange 2013/2016 Recreate Arbitration Mailboxes

You will then need to run the following command from the correct installation media – Setup.exe /PrepareAD /IAcceptExchangeServerLicenseTerms – This command will re-create the Active Directory objects required to re-create the mailboxes.

You will then need to re-enable the mailboxes using the below commands.

Enable-Mailbox –Arbitration –Identity “FederatedEmail.4c1f4d8b-8179-4148-93bf-00a95fa1e042”
Enable-Mailbox –Arbitration –Identity “SystemMailbox{1f05a927-8668-4003-adad-9b80758e86db}”
Enable-Mailbox –Arbitration –Identity “SystemMailbox{e0dc1c29-89c3-4034-b678-e6c29d823ed9}”
Enable-Mailbox –Arbitration –Identity “SystemMailbox{bb558c35-97f1-4cb9-8ff7-d53741dc928c}”

If these happen to fail you can change the -Identity by obtaining the object ID from the Active Directory object (Right Click –> Rename –> Ctrl+C).

You will need to also change the Display Name of SystemMailbox{e0dc1c29-89c3-4034-b678-e6c29d823ed9} to “Microsoft Exchange” this can be completed by running the below command –

Get-Mailbox –Identity “SystemMailbox{e0dc1c29-89c3-4034-b678-e6c29d823ed9}” –Arbitration | Set-Mailbox –Arbitration –DisplayName “Microsoft Exchange”

The Federation Mailbox also requires a 1MB Quota, this can be completed by using this command –

Get-Mailbox –Arbitration –Identity “FederatedEmail*”} | Set-Mailbox –Arbitration –ProhibitSendQuota 1MB

Exchange - Microsoft Exchange 2013/2016 Recreate Arbitration Mailboxes

Finally to confirm that all of the Mailboxes are now running correctly. You can re-run the Get-Mailbox -Arbitration command as per the screenshot below.

Get Mailboxes Arbitration - Microsoft Exchange 2013/2016 Recreate Arbitration Mailboxes

Thanks for reading!

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