All 2003 AD and Exchange 2003 servers no longer exist in domain. Did not run forestprep before adding 2008 AD. Trying to install fresh EX 2010. We have tried "setup /removeorg" from Ex 2003 cd but had compatability problems. Would like to remove all old Exchange 2003 from new AD. Problems first occoured when trying to install EX 2010, saying "the exchange organization is not in native mode", and "the forest functional level must be at least windows 2003 native"