Sometimes you can run the following cmdlet:
Get-Mailbox –Arbitration
and you could get an empty list of Arbitration Mailboxes.
If you don’t know what is Arbitration Mailboxes, here is what tech-net says about them:
Arbitration mailboxes are used for managing approval workflow. For example, an arbitration mailbox is used for handling moderated recipients and distribution group membership approval.
So, it’s obvious, it’s better to have those mailboxes 
.
As a first step, we should validate if we have accounts for those mailboxes. By default, they should be created in domain.local/Users and named as follows:
If don’t have those records, we should run again the following command from the Exchange 2010 DVD:
setup.exe /PrepareAD
If we have those accounts, or we recreated them by running setup.exe /PrepareAD, we to need create mailboxes for them. It’s a very simple task, all what we have to do, is to run the following commands:
Enable-Mailbox –Arbitration –Identity "SystemMailbox{GUID}"
Enable-Mailbox –Arbitration –Identity "SystemMailbox{GUID}"
Enable-Mailbox -Discovery -Identity "DiscoverySearchMailbox{GUID}"
Enable-Mailbox -Discovery -Identity "FederatedEmail.GUID"
Note: Remember to use quotation marks, otherwise commands won’t work.
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October 20, 2011 at 10:04 am
What an all ’round amazingly written piece..
December 5, 2011 at 2:08 pm
That was a really good post.
September 9, 2012 at 2:45 am
Excelent Post:)