I took my very first Microsoft exam in June of 1995 (Visual Basic 3.0).  I received my initial MCSD in 1996.  I upgraded with each version of Visual Basic, although I did let it lapse once in 1999, but renewed a week or two later.

I've completed 2/5 exams for the MCSD.NET.  So far, I've taken 70-300 (Arch and Design) and 70-229 (Sql Design/Impl).  I've scheduled the 3 remaining exams for this month:

Tuesday, August 16: 70-316 (Win apps using C#)
Wednesday, August 24: 70-315 (Web apps using C#)
Wednesday, August 31: 70-320 (Xml Web Services using C#)