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Missing Exchange mailbox Arbitration

 

Sometime you can run into situation that you Arbitration mailbox got deleted, this can happen if you accidentally delete them from Active Directory or during migration for older version of exchange . To check if you any Arbitration mailbox :

Get-Mailbox -Arbitration

if you get none you will need to re-create them !

To re-create them you need exchange instillation media inserted or mounted into the server. Then execute :

<Virtual DVD drive letter>:\Setup.exe /PrepareAD /IAcceptExchangeServerLicenseTerms

Then make sure they have created :

Get-Mailbox -Arbitration

Now you need to enable those mailbox, For each exchange version you have different default mailbox Arbtration :

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

More information :

https://jacob.gardiner-moon.co.uk/2015/11/26/microsoft-exchange-2013-2016-recreate-arbitration-mailboxes/
https://docs.microsoft.com/en-us/exchange/architecture/mailbox-servers/recreate-arbitration-mailboxes?view=exchserver-2019


Good Luck

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