Adprep detected that the domain is not in native mode

Rather irritatingly, it doesn’t say how to put it into native mode – but it is a very simple operation:

On a domain controller, fire up Active Directory Domains and Trusts. Right-click on your domain and select Raise Domain Functional Level. From the drop-down list box, select Windows 2000 Native and click Raise.

You’ll get a message indicating that the functional level was raised successfully. As you’ve probably already clicked ‘OK’ – it also mentioned that it may take some time to replicate the change to other domain controllers. If ADPREP still complains – then you know why! Go make yourself a coffee!

Did you find this hint useful? Are you looking to learn more? Well, here’s a few books that I’ve found useful – have a goosie!

Windows Server 2008 Administrator’s Companion

Windows Server 2008 for Dummies

Introducing Windows Server 2008

Designing, Deploying, and Running Active Directory