Survival for the fittest
"Turner made clear that Windows, Office, and other long-running products remain important. He even defended Microsoft's controversial device efforts, though he indicated the Surface line is less a Microsoft cornerstone than an attempt to inspire OEMs. But he also emphasized that all of these products ultimately feed the Microsoft cloud, which makes it the platform on which most of the company's other platforms sit.'
Michael, I think it's like "Survival for the fittest". When competitors are offering all software and tools through cloud, they cannot back out from that.