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Exchange Discovery MailBox is gone

G F asked
Last Modified: 2020-10-28
I have an Exchange Server 2013 running CU 20.
When I go into EAC and select 'Compliance Management' from the side menu I get the following error:

The discovery mailbox, a hidden default mailbox that is required to search mailboxes, can't be found.  It may have been
inadvertently deleted.  This mailbox must be recreated before you can search mailboxes.

I also noticed the same error when I tried to export a mailbox to a PST.

When I go to Exchange Powershell, I use this command:

Get-Mailbox -Resultsize unlimited -Filter {RecipientTypeDetails -eq "DiscoveryMailbox"} | FL

And it lists nothing, like there is no DiscoveryMailbox.

So I then, run:

Get-Mailbox -Arbitration

and this is the output:

 Arbitration Command

This is a production Email Server, should I just use the following command to fix the missing Discovery mailbox?

New-Mailbox -Name SearchResults -Discovery

What does the output of the Arbitration mean?  There used to be a 2010 Exchange Server in the network, it has been removed for over a year, does that Migration need to be there?

Thank you!
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Active Directory/Exchange Engineer
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