Ok first here is our systems background:
-Active Directory with server 2012 DCs running in server 2003 domain and forest functional levels because we have a flat domain name with no TLD. We are also running Exchange 2003
We are wanting to upgrade Exchange 2003 and change domain name to include a TLD as required by windows server starting with 2008 r2. What is the simplest way of doing these 2 things?