What is the proper step wise process to decommission Exchange 2007 after 2013 upgrade. I have left the 2007 in a shut down state and I have not seen any issues apart from Send connector which I fixed as soon as problem surface after shutdown. Now it has been more than two and I bringing it up today for un-installation .
I might have to delete the disconnected mailbox that still exists in 2007. Is there a pshell command to delete disconnected boxes. Also, it is save to remove the exchange 2007 mail database that shows on new ECP?