How to recreate System Mailbox , FederatedEmail & DiscoverySearchMailbox in Exchange 2010

How to Verify these mailboxes are available and its active or not

Running in Exhcange Management Shell

Get-mailbox -arbitration

Should Show up SystemMailbox and FederatedEmail

Find which version of exchange you're using in order to recreate them.

Must be the same version

Open Command Prompt

Browsed into the Setup location , Run

Setup.com /prepareAd

This would Create System Mailboxes , FederatedEmail & DiscoverySearchMailbox

Extract GUID names in order to Enable them

For Example –

System Mailbox GUID values

SystemMailbox{1f05a927-6a9b-4101-abd2-70838d0c8e86}
SystemMailbox{e0dc1c29-89c3-4034-b678-e6c29d823ed9}

FederatedEmail GUID values

FederatedEmail.4c1f4d8b-8179-4148-93bf-00a95fa1e042

DiscoverySearchMailbox GUID values
DiscoverySearchMailbox {D919BA05-46A6-415f-80AD-7E09334BB852}

Now We Got to Enable them – 

Enabling System Mailboxes

Enable-Mailbox –Arbitration "SystemMailbox{Guid Value1}"

Enable-Mailbox –Arbitration "SystemMailbox{Guid Value2}"

Enable-Mailbox –Arbitration "FederatedEmail.Guid Value"

Enable-Mailbox - Discovery "DiscoverySearchMailbox {Guid Value}"

Then in exchange powershell run.

Enable-Mailbox –Arbitration "SystemMailbox{1f05a927-6a9b-4101-abd2-70838d0c8e86}"

Enable-Mailbox –Arbitration "SystemMailbox{e0dc1c29-89c3-4034-b678-e6c29d823ed9}"

Enable-Mailbox –Arbitration "FederatedEmail.4c1f4d8b-8179-4148-93bf-00a95fa1e042"

Enable-Mailbox - Discovery "DiscoverySearchMailbox {D919BA05-46A6-415f-80AD-7E09334BB852}"

Now to Verify If you Did the Right thing

Running this – It should show up your System Mailboxes , FederatedEmail

source:

http://www.careexchange.in/how-to-recreate-system-mailbox-federatedemail-discoverysearchmailbox-in-exchange-2010/