Not to mention some of the most popular games of all time - Minesweeper, Solitaire, and the earlier Reversi. And a pinball game in Windows 95.
A while back they made an online version: http://www.hover.ie/
This was how Microsoft taught people to do things like double-click, click-and-drag, and a number of other things that we take for granted today but were completely foreign back then.
Pinball game was licensed, not developed by Microsoft AFAIK
This is from memory, mind you.
I still exclaim "roll over, Beethoven!" whenever appropriate.