Look in the \support\adprep folder on your installation media.
It adds new object classes and attributes required by the newer OS. download adprep windows 2008 r2
You must run these commands in a specific order and on specific servers. Always ensure you have a valid backup of your Active Directory before starting. 1. Forest Preparation (/forestprep) This must be run on the FSMO role holder. dc promotion from 2003 to 2008R2 - Server Fault Look in the \support\adprep folder on your installation
The Adprep utility prepares your existing Active Directory forest and domain for a new version of Windows Server. It performs two primary tasks: download adprep windows 2008 r2