When looking for information on migrating server 2003 to 2012 I found this artical and I feel that it will be useful in the future. Here is the url to the page I found.
http://blogs.technet.com/b/canitpro/archive/2013/05/05/step-by-step-adding-a-windows-server-2012-domain-controller-to-an-existing-windows-2003-network.aspx
