I am new to server migration and am looking for input on the types of migration that would best meet my orginizations needs. Our servers need to have high availability. We currently have one main DC with he backup both running 2003 r2 we would like to migrate the correct schema to our 2008 r2 servers. My goal is to migrate multiple roles from sver2003 to 2008. These roles include AD, DNS, DHCP, GP, and file services. Now I see tutorials all over the Internet on how to migrate and but not as much on other roles is there a full comprehensive guild on how to go about this process. Like which roles should I migrate first and what the best type of migration would be to meet our needs. And what are the best practices I'm willing to buy books DVDs to learn this as fast but good as possible. Any suggestions.