It’s official, Windows 8 is a write-off . Sales for the operating system have been poor and now it is even starting to lose market share to Windows 7. To Microsoft MSFT -0.25%’s credit it has bravely persisted addressing issue after issue. Most notable was the major Windows 8.1 Update 1 patch released in April which makes the OS a genuinely credible platform. Still it remains far from perfect and now Microsoft is prematurely pulling the plug.