The Microsoft Certified IT Professional (MCITP) credential is the premier certification to highlight a professional's area of expertise, such as database administration, database development, business intelligence, messaging, or support.

A Microsoft Certified IT Professional: Windows Server Administrator possesses the high level of knowledge and skills needed to support end users in medium-sized or enterprise environments with the most critical and difficult support issues. This includes the knowledge and skills to diagnose and resolve all types of desktop support issues, as well as issues involving mobile and personal devices.
70-640: Windows Server 2008 Active
Directory, Configuration
70-642: Windows Server 2008 Network Infrastructure,
Configuration
70-643: Windows Server 2008 Server Administrator