Windows Phone 8 will share native C and C++ code with Windows 8. Native game development gets a boost, too, with DirectX and common graphics drivers support. The shared kernel will greatly simplify how developers can create apps for both platforms. Microsoft notes that the presentation layer, which will be optimized for different types of devices and experiences, is separate from the underlying code.

In its most basic sense, this structure will make it possible for developers to write once, and publish many. The code base can be reused across different devices; only the presentation will need to be revisited. This will also make it easier for developers to ensure the quality of their software; the need to test against multiple variables is often an albatross for Android developers. The Internet Explorer browser will do the same HTML rendering on the phone, PC, and slate, which is another critical component for jump-starting development for cross-platform Metro apps.

Microsoft claims the Windows Phone Marketplace has 100,000 applications -- double the number of of six months ago. According to Microsoft, the company reached the 100,000 apps milestone faster than Android did.

Even so, Windows Phone has a long way to go to boost the breadth of its selection vis a vis iOS and Android. That's why this behind-the-scenes change to support developers is so critical for Microsoft and for consumers.