Windows Vista is now the world 's most popular desktop OS , according to a report . It surpasses the venerable Windows XP , which is 20 years old . Windows 8 , which is scheduled to go on sale on October 26 , will be Microsoft 's first operating system designed to work just as well on tablets as it does on desktop computers . Microsoft controls some 80 % of the market for desktop operating systems .
Windows Vista is now the world 's most popular desktop OS , according to a report . It surpasses the venerable Windows XP , which is 20 years old . Microsoft controls some 80 % of the market for desktop operating systems .