I sat the original .net exams way back when, and I achieved my MCSD.NET. Its so long ago I cannot even remember when I completed everything. I think it was 2004/2005.
I accomplished this and after that never bothered with any of the upgrade exams as I never felt the need to upgrade as I had nothing to prove anymore.
However in the company that I now work for they wanted to me get certified again.
So today I started on the first exam, Programming in C#
I had 55 questions to answer in 150 minutes.
Glad to say that I passed.