Windows 7 is now the world 's most popular desktop OS , according to a report . Comment: Users running Windows XP , Vista or Windows 7 will be able to upgrade to Windows 8 Professional for $ 39.99 via an online download . Microsoft controls some 92 % of the market for desktop operating systems .
Windows 7 is now the world 's most popular desktop OS , according to a report . Comment: Microsoft controls some 92 % of the market for desktop operating systems .