Microsoft Windows is collapsing under its own weight and must radically change for the sake of users, independent software vendors and Microsoft itself, according to research firm Gartner. Because Microsoft Windows is so large and complex, covering 20 years of legacy code, it can no longer adequately respond to market forces, and Windows needs to be securely redesigned, said Gartner analysts Michael Silver and Neil MacDonald. They delivered the news at the Gartner Symposium/ITxpo 2008 in Las Vegas this week.