Remote Server Administration Tools (RSAT) for Windows Vista allows administrators to use their Vista machines to manage their Windows 2000, Windows Server 2003, and Windows Server 2008 infrastructure.
Microsoft Remote Server Administration Tools for Windows Vista for x86-based Systems
Microsoft Remote Server Administration Tools for Windows Vista for x64-based Systems
2. Installation and configuration:
After you install this, open Control Panel -> "start Programs and Features"->"Turn Windows Features on or off" -> scroll down to the Remote Server Administration Tools ->turn on the the features you needed, or just simplely turn on all features.
3. To fix missing tab issue of "AD users and computers":
Specifically, in Active Directory Users and Computers (DSA.MSC) when you looked at the properties of a user, you do not see:
Terminal Services Profile
This is a known issue and has now been fixed by MS KB960890: "Some tabs are not available in the properties of a user account in the Active Directory Users and Computers MMC snap-in after you install Remote Server Administration Tools (RSAT) on a computer that is running Windows Vista"
4. Reference reading:
A guide to install and setup
RSAT and ADUC: Getting the Terminal Services Tabs to Appear in AD Users and Computers
RSAT (Remote Server Administration Tools): what's included and what's NOT!!