Insider Windows 8 and Windows 8.1 pass 10% market share, Windows XP falls below 30% (Updated) With the release of Windows 8.1 to the world in October, Microsoft ended 2013 with two full months of availability for its latest operating system version. While Windows 8.1 is certainly growing quickly and eating into Windows 8’s share, the duo has only now been able to pass 10 percent market share, whil