So go ahead and run that AD DS Installation wizard (or PowerShell cmdlet), and don't worry about how you will run the ADPREP from the existing Domain Controllers, because you don't have to. If you have already run ADPREP from Windows Server 2003 SP1 or higher previously, most likely /GPREP will have been run already. Now, on your computer, click on Add a device in the top-right corner of the window. If you have never run the ADPREP /DOMAINPREP /GPPREP (which will add ACEs to the GPOs in the SYSVOL folder to enable additional RSOP functionality) in an existing domain before, this will need to be done manually. On your PS4 controller, press and hold the PS and Share buttons until the controller lights start flashing. There is however one case, where you would need to run ADPREP manually: This makes the installation process significantly easier, as you do not have to attach the installation media to an existing Domain Controller and run ADPREP from there. The Windows Server 2012 (R2) server, on which the AD DS installation process is running, will perform the ADPREP tasks remotely on the existing Domain Controllers.
There is however one thing, most of them seem to forget:ĪDPREP, that prepares the forest and domain(s) for the new Active Directory version, is now a part of the Active Directory Domain Services installation process, both when using the Server Manager Wizard and when running Install-AddsDomainController. There are many great step-by-step guides out there about upgrading your Active Directory forest to Windows Server 2012 (R2).
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