"Software" is rather broad. If you're making shiny .NET stuff for consumers, yeah, you might not want to bother. But even w3schools shows XP as the most popula

"Software" is rather broad. If you're making shiny .NET stuff for consumers, yeah, you might not want to bother. But even w3schools shows XP as the most popular OS by far, and only slowly decreasing: http://www.w3schools.com/browsers/browsers_os.asp http://www.w3schools.com/browsers/browsers_os.asp