I mistakenly deleted the system mailboxes.

The error I noticed is Scenario: ProcessOrgExtensions. The organization mailbox for ***.com could not be retrieved.  Event: 3054.  Also Outlook now shows "updating address book" for an extended period of time.

I recreated user accounts using setup /PrepareAD.  No issue there.

Then the command:

Enable-Mailbox -Arbitration -DomainController <FQDN of root global catalog server> -Identity "SystemMailbox{e0dc1c29-89c3-4034-b678-e6c29d823ed9}"

This should enable the arbitration mailbox and everything should be fixed...but I get the following error.

_______________________________________________________________________________________

This task does not support recipients of this type. The specified recipient
server2k/Users/SystemMailbox{e0dc1c29-89c3-4034-b678-e6c29d823ed9} is of type UserMailbox. Please make sure that this
recipient matches the required recipient type for this task.
    + CategoryInfo          : InvalidArgument: (server2k/Users/...8-e6c29d823ed9}:RecipientIdParameter) [Enable-Mailbo
   x], RecipientTaskException
    + FullyQualifiedErrorId : [Server=IREXCH02,RequestId=9f634f55-be78-481e-9f3c-204d6cc3ba65,TimeStamp=4/28/2015 2:07
   :11 PM] [FailureCategory=Cmdlet-RecipientTaskException] B41D8DD4,Microsoft.Exchange.Management.RecipientTasks.Enab
  leMailbox
    + PSComputerName        : irexch02.server2k

_______________________________________________________________________________________

At this point I am not sure how to get past this step. As far as I can tell I have done everything correctly, outside of causing the issue in the first place.  Any help would be greatly appreciated.

Thanks

Tom

It sounds like there has already been a regular mailbox attached to those arbitration accounts (SystemMailbox*). Try removing that mailbox (Disable-Mailbox) and recreate using that Arbitration switch.

I do not see a regular mailbox or even for matter a disconnected mailbox in the system. 

Here is the issue I see. The 2 other system mailboxes exist. But when I look for the one associated with the OAB it is not present, which is the one I am trying to create. Sorry clearly not an Exchange admin by training but do know how to find my way around for the most part. I am a DBA trade.  Below are the commands that I used to look at it and the results.

[PS] C:\Windows\system32>Get-Mailbox -Arbitration

Name                      Alias                ServerName       ProhibitSendQuota
----                      -----                ----------       -----------------
FederatedEmail.4c1f4d8... FederatedEmail.4c... irexch02         1 MB (1,048,576 bytes)
SystemMailbox{e0dc1c29... SystemMailbox{e0d... irexch02         Unlimited

[PS] C:\Windows\system32>Get-Mailbox -Arbitration | where {$_.PersistedCapabilities -like "*oab*"} | ft name,servername
[PS] C:\Windows\system32>

Hi,

Based on the cmdlet Get-mailbox, SystemMailbox{e0dc1c29-89c3-4034-b678-e6c29d823ed9} is already enabled, so you dont need to enable it. To recreate the other system mailbox, please take the following steps:

1.   Open ADUC, navigate to server2k -> Users, check if there are the following system mailboxes:

• SystemMailbox{bb558c35-97f1-4cb9-8ff7-d53741dc928c}
• SystemMailbox{1f05a927-6a9b-4101-abd2-70838d0c8e86}

2.   If they exist, then please run the following command to enable them. If they dont exist, run Setup.com /prepareAD to create them.

• Enable-Mailbox Arbitration SystemMailbox{1f05a927-6a9b-4101-abd2-70838d0c8e86}
• Enable-Mailbox Arbitration SystemMailbox{bb558c35-97f1-4cb9-8ff7-d53741dc928c}

3.   For discovery mailbox, please refer to this document

Delete and re-create the default discovery mailbox in Exchange

https://technet.microsoft.com/en-us/library/dn750894(v=exchg.150).aspx

Best Regards.