Quote Originally Posted by A_Ahmed View Post
Its quite simple on what you have to do. Add your 2008 R2 as a member server, leaving your 2003 as a DC for the time being.
Once added, you need to extend your schema on the 2003 DC running the adprep utility. (You need to copy the adprep folder to your local 2003 DC and run forestprep, domainprep).
You will now need to promote the 2008 R2 box as a domain controller and then transfer your FSMO roles to your 2008 R2.
Finally you can demote your 2003 box as everything will be running on the 2008 server.
Don't forget to export and migrate your DHCP scopes...