I have Exchange 2010 installed with a CAS/Hub Transport Server in the primary site as well as a CAS/Hub Transport in the DR site. Currently we have Exchange 2003 co-existing in the same Domain. POSTINI points to the 2003 front end so all inbound mail is forwarded from Exchange 2003 to 2010. Also, I have an Edge Transport (not configured) installed in the perimeter network of both sites.
My question is this: When I create the edge subscription xml file and import it into the CAS/Hub Transport Server will this cause any disruption in the Exchange 2003/2010 environments?
If all the appropriate ports are not open or communication between the Edge and Hub Transport Server is not working or my configuration is incorrect will I be able to correct these problems without out impacting the current environment? This is my first Exchange install so any information is greatly appreciated.