The adminpak for Windows Server 2008 (RSAT) will not run on Windows XP. In our test environment, we configured:
- Windows Sever 2008 R2 Domain controller
- Windows Server 2003 member server
- Windows XP SP2
We copied the adminpak.msi file from the 2003 server and installed it on the XP client. We were able to create an OU, Group, and User account on the 2008 domain controller without any issues. The RSAT program is not part of server 2008 like the adminpak was for 2003. You will need to download it from Microsoft.
Microsoft Remote Server Administration Tools for Windows Vista