here is an article from microsoft about the history of windows:
http://microsoft.com/windows/winhistoryintro.asp
i have windows 1.01, 1.03, 2.03, 3.0, 3.1, 3.11 for workgroups, 95, 98, and me. from the nt side i have, nt 3.1, 3.51, 4workstation, 4server, 2000pro, 2000server, xp home, xp pro, xp corp. around my house i have unhealthy amounts of dos versions too. windows has been around for quite a while now that i think about it...