uninstall exchange 2013 in hybrid 2010 environment

Previous setup was an Exchange 2010 environment.  Two CAS servers, two Mailbox servers, and two Edge servers.

I prepped the domain for an Exchange 2013 deployment and installed two CAS servers, two Mailbox servers, and two Edge servers.  I also setup a DAG for 2013.  I can manage the entire Exchange environment from the 2013 install and have been successful creating mailboxes and DL's in the 2010 environment from the 2013 servers but no mailboxes have ever been migrated to 2013.  Everything still sits on Exchange 2010.

We are now moving in a different direction with our domain structure and I need to remove 2013 without harming our current 2010 setup.  Are there steps I can reference to safely uninstall Exchange and clean up the aftermath in AD?
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ckeshavSr. Infrastructure SpecialistCommented:
Note: It is safe to test the process in a Lab environment and then follow the process to remove from your live environment.
I understand you don't have any User Mailbox in Exchange 2013. If you want to remove Exchange 2013 from your environment you need to first remove the Arbitration Mailboxes
The complete cmdlet will be like this one:

Get-Mailbox -Arbitration -Database <MailboxDatabase> |  Disable-Mailbox -Arbitration –DisableLastArbitrationMailboxAllowed


Get-Mailbox -Arbitration | Remove-Mailbox -Arbitration -RemoveLastArbitrationMailboxAllowed

After running that command you can start the removal process of your last Exchange Server 2013 and the Arbitration Mailbox is no longer going to be an issue. You can either run Exchange 2013 Setup.exe or navigate to Control Panel to modify or remove Exchange 2013 (either server roles or an entire installation).

Once this is done you go move to removing Exchange 2013 from Active Directory. Following link should help you.

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Did you find this worked for you?

We had a similar situation where after installing Exchange 2013 to a 2010 environment. The customer then asked this to be removed without every using it. When we did this we found that you have to have 2013 to manage the Off Line Address book. We reinstalled the exchange 2013 and it running as a VM, doing nothing. How would we get around this. Would installing the management tools over come this?
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