I don't really care if they mix it or not. They're two different market that have different use.
I wonder why not add the "device" market to the calculation as well? In that way *nix can approach > 80% marketshare easily. (Things like GPS navigation tablet or car's self-check system runs on *nix AFAIK, mostly because modern Windows don't fit the low memory requirement and didn't run on low power consumption ARM chips at that time)