ONE MORE THING
Actually, if ALL platforms (including mobile) are included in sales statistics then in 2000 Windows had an overall 96% market share. In 2013 Windows had a just a 36% market share. As I think Balmer has admitted in recent interviews, the failure to recognize early on the advent of mobile computing was the single greatest failing of his years as MS CEO. In today's tech world unless you have a really great product in a given category or one that can differentiate from the competition in a major way it is hard to play catch-up. I think MS will continue to dominate the desktop (and especially the enterprise) for a long time but it may be too late for the company to catch up with the mobile juggernaut of the past few years.