MS biggest cash cows since years are not their operating systems, but their office suite(s), server licences, corporate service programs and potentially also their IP revenues (including other OS like e.g. Android HW manufacturers) - key to that might be their OS dominance in the corporate PC / desktop world.<p>To see / visualize that this is changing and to make these numbers more useful, they need to be combined with e.g. device numbers to get to a level of market penetration / share (might also need to be broken into corporate / personal). It's quite a different situation for a company selling your closely OS-linked solutions to almost every company / PC user when you're holding >75% market share in the OS segment or when your market share has dropped to 40%+ overall. This effect might intensify over the next years with BYO, more powerful handheld devices etc.<p>There are also major gaps in the data - you might also want to check Wikipedia and MS annual reports for references to more sales data (e.g. <a href="http://www.theverge.com/2012/7/9/3146777/windows-7-630-million-licenses-sold-enterprise-adoption" rel="nofollow">http://www.theverge.com/2012/7/9/3146777/windows-7-630-milli...</a>)