Re: All this shows me....
"Care to explain why?"
I can't speak for the OP, but from the article: "Windows 8.1 is up from 10.04 per cent in January to 10.49 per cent in February on Netmarketshare's numbers, and from 14.27 per cent to 14.78 per cent according to Statcounter."
So two groups try to measure the same thing and they come up with figures that differ by about a third. Back when I was in science classes, if I had two measurements that differed by that much then I'd expect to have my knuckles rapped if I quoted either to 2 decimal places. The correct way to interpret these figure is to call them "experimental proof that at least one of them hasn't got the precision they are quoting".