Adding 2008 domain controller to 2003 domain, which also contains 2012 DC

Windows Server. > … Looking to upgrade one of my 2003 DC's for starters up to 2008 (will address additional steps after that). … If you plan to install Windows 2008 or 2008 R2 as Domain controller, there is no adprep to do.

Windows 2008 VPS via Adding 2008 domain controller to 2003 domain, which also contains 2012 DC.