Windows .NET Server 2003 is the latest version of Microsoft's flagship operating system. The Windows .NET Network Infrastructure Administration exam (#70-276) is a core requirement for the Microsoft Certified Systems Engineer (MCSE) track, and an elective for the Microsoft Certified Systems Administration (MCSA) track. This exam does not replace the Windows 2000 version (#70-216), as Microsoft has decided to allow both the Windows 2000 and Window .NET Server tracks of the MCSA and MCSE programs to run concurrently.