http://bestmobs.com/windows-xp-still-one-of-the-most-popular-oses-in-the-world/
a very popular operating system but nobody knew PC consumers will be so hooked on to the OS that they wouldn't let go even after several major versions were released and support for the software even officially discontinued.

operating system market share

And so was the fate of Windows XP, a one-and-half-decade old OS which still occupies nearly 17% of computers and beating every other desktop OS out there save for Windows 7 which accounts for 58 % of computers. Data provided by research firm Net Application shows that the OS loosened some ground from the 19.1% market share it had in February.

Nonetheless, Windows XP is still far more popular than Windows 8 (3.5%) and Windows 8.1 (10.5%) put together. Apple's Mac OS X 10.10 and 10.9, jointly accounting for 5.5% are both out out of the game as Microsoft's evergreen OS reigns supreme from generation to generation.
A full chart of desktop operating system market share as o