said by The Seattle Times :
The whole company [Microsoft] has been driving for years toward this radical overhaul of its flagship operating system.
It's an urgently needed move as computing moves increasingly away from traditional PCs -- on which Microsoft built its dominance -- to mobile devices such as smartphones and tablets, areas where its competitors dominate.
But the dominance of Apple's iOS and Google's Android platforms in the mobile realm threatens the future of Windows
For Microsoft, "that's a huge headache because the value of the Windows franchise is that it's the dominant personal-computing operating system, and it's not anymore," said Frank Gillett, an analyst with research firm Forrester.