Exchange 2013 RMS Shared Identity user FederatedEmail.4c1f4d8b-8179-4148-93bf-00a95fa1e042 not found

Today I was re-installing into an forest The schema was already extended with the schema extensions.

When installing 2013, installation of the Mailbox Transport role failed with the following error:

Error:
The following error was generated when R0;$error.Clear();
if ( ($server -eq $null) -and ($RoleIsDatacenter -ne $true) )
{
-RmsSharedIdentity -ServerName $RoleNetBIOSName
}
R1; was run: “RMS Shared Identity user FederatedEmail.4c1f4d8b-8179-4148-93bf-00a95fa1e042 not found.”.

FederatedEmail.4c1f4d8b-8179-4148-93bf-00a95fa1e04 is a built in arbitration user account which must exist in every 2013 environment. The GUID never changes, it is always R0;4c1f4d8b-8179-4148-93bf-00a95fa1e042”.

The setup failed because someone deleted this user account from Active Directory!

How can we get it back?

You have two ways to get this mailbox back. If you have a computer on your network with the management installed, you can create the user account using with the following command:

New-Mailbox -Arbitration -Name FederatedEmail.4c1f4d8b-8179-4148-93bf-00a95fa1e042 -UserPrincipalName FederatedEmail.4c1f4d8b-8179-4148-93bf-00a95fa1e04@default_accepted_domain

For more information on this see Microsoft KB978776

What happens if you do not have management shell installed on any computers? Well there is another way to get this account back. This account is originally created when you prepare the domain/schema. If you run setup.com /PrepareAD on your domain it will re-create this account for you. See below:

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