A Decade On, Windows XP Is Still the World’s Most-Used Desktop OS [Techiversary] By kenmay - October 26, 2011 0 205 Share on Facebook Tweet on Twitter tweet Windows XP first went on sale ten years ago today. In that span, it has become the desktop OS of choice with a worldwide install base of as much as 80 percent. Here’s looking at you XP. More Share this:TwitterFacebook