How to install Active Directory Users and Computers for Windows 2008

From Server Manager (available under Administrative Tools), go to "Features", then "Add Features".

Windows Server 2008 Standard Instructions:

Expand:

• Remote Server Administration Tools
  • Role Administration Tools
    • Active Directory Domain Services Tools

Then check Active Directory Domain Controller Tools.

Windows Server 2008 R2 Instructions:

Expand:

• Remote Server Administration Tools
  • Role Administration Tools
    • AD DS and AD LDS Tools
      • AD DS Tools

Then check AD DS Snap-Ins and Command-Line Tools.

Feature Includes:

• Active Directory Users and Computers
• Active Directory Domains and Trusts
• Active Directory Sites and Services

The first answer from Mathieu Chateau was basically correct, you do not have to dcpromo to get this. however, the role option is "AD DS and AD LDS Tools" not "Active Directory Domain Services Tools"

Mike