Windows Store: Drumming Up App Support
No tablet or smartphone platform can truly succeed without active participation from third-party developers. That was one of the principal issues that HP had with webOS, and it’s precisely the reason why Microsoft released this early build of Windows.
Silverlight, for example, is still supported for older applications, but it's not part of the new API. Microsoft did demonstrate at the BUILD conference, however, that a conversion to Metro could be seamless. If you’re a developer, think about reusing 90% of your old code. The missing component is the UI you have to design from scratch to make an app “Metro-y.”
ARM devices will be restricted to using the WinRT API. This is intended to address power consumption issues with resource-intensive programs like Photoshop. Microsoft intends to enforce this policy by forcing ARM-based devices to install applications through the Windows Store, which is currently unavailable in the pre-beta version of Windows 8.
If you’re a developer and want more information on Windows 8 and Windows Phone 8, we highly recommend reading David Burela’s blog posts on BUILD.