A Microsoft Certified Systems Engineer is an individual who is certified by Microsoft, certifying that he/she has the skills and knowledge to work with networking concepts and networking systems.
The MCSE certification proves that that the professional is skilled in designing, implementing, and administering infrastructures, based on Windows Server 2003 and Microsoft Windows 2000 Server.
The MicrosoftMCITP Enterprise & Server Administrator certification is the new version of MCSE. It is effectively the latest "MCSE 2008" program, and has replaced both the MCSE and MCSA on Server 2003.
To certify on newer Microsoft technologies, such as Exchange Server 2010, SQL Server 2008, or Windows Server 2008, you should opt for the Microsoft Certified IT Professional (MCITP) certification.
If you already have the MCSE 2003 certification, you can upgrade to the Microsoft Certified Technology Specialist (MCTS) and Microsoft Certified IT Professional (MCITP) on Windows Server 2008 certifications.