We recently replaced our Exchange 2007 Hub / CAS (EXCHHUBCAS1) server with a new server (EXCHHUBCAS). The old server has now been re-used but unfortunately Exchange 2007 wasn't removed before the server was rebuilt and the computer account has been deleted from AD. We therefore have two HUB / CAS servers in our Exchange Org, the old and the new. Is there a way to remove the old server from the Exchange org? Out of interest when MS hopefully release a service pack for Server 2008 r2 which makes the OS compatible with Exchange 2007 we will build a new Hub / CAS server on this OS to replace the current one. This new server will have the name of the original Hub / CAS server (EXCHHUBCAS1) and the same IP address. Could I run setup on this new server with the RecoverServer switch? If so would this mean that I don't need to worry about the old server being present in the Exchange org until we do he upgrade?