Actually, 4 exams are required for the MCSA:
- 70-210 or 70-270: Windows client exam (Win2K Pro or XP Pro, respectively)
- 70-215 or 70-275: Windows server exam (Win2K Pro or Server .NET, respectively)
- 70-218 or 70-278: Windows Network management (ditto above)
- One elective, which may even be A+ and Network+ or A+ and Server+
See http://www.microsoft.com/TrainCert/mcp/mcsa/requirements.asp for all the gory details.
But if you already have an MCSE, there's no compelling reason to also obtain an MCSA (though you can probably do so by taking only the 70-218 exam).
This was first published in August 2002