Besides what Mac lovers or Linux lovers can say, Windows is the foundation of the personal computing and a mandatory reference when people speaks about personal productivity or how the computer came to make our lives easier, fun, productive and helps people to realize their full potential.

This may sound too much marketer or a compilation of clichés by some people :) however I think Windows is now part of the human history as the tool which make computing accessible to everyone.

This is a very nice coverage of the 25 years http://www.internetnews.com/software/article.php/3784541/After+a+Quarter+Century+of+Windows.htm

Happy birthday!