Installing Remote Server Administration Tools for Windows Server 2008
Many of the tools used to configure, manage, and debug servers are included in Support Tools, which was included with prior versions of Windows Server. For Windows Server 2008, these tools are included in Remote Server Administration Tools (RSAT). The RSAT package is included by default when Windows Server 2008 is installed, but you must install the individual tools before you can use them. Use Server Manager to install the RSAT tools.
To install server tools for Windows Server 2008
In Server Manager, click Features in the left pane, and then click Add Features in the right pane.
In the resulting Features list, expand Remote Server Administration Tools.
Expand Role Administration Tools.
Select the tools that you want to install.
To install ADSI Edit and the Active Directory Users and Computers snap-in, expand Active Directory Domain Services Tools and then select Active Directory Domain Controller Tools.
Click Next and then click Install.