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Microsoft banks Windows Phone 7 on Silverlight

Downsizing a big opportunity?

Microsoft's Flash-challenging Silverlight media player could be the hidden secret driving Windows Phone 7, the Redmond mobile OS unveiled this week.

Silverlight will be named the platform for building native applications in Windows Phone 7 and future generations of Windows Phones at next month's Mix conference, unnamed sources have told CRN.

Hoopla and hype of this week's debut aside, the actual technology details on Windows Phone 7 have been vague. Microsoft has not said what the operating system is under the covers.

Redmond has been careful to position this latest rev of its software and phones as "Windows Phone 7" and not Windows Mobile 7 - which is what everyone had been calling it prior to this week as it was the successor to Windows Mobile 6.5. For what it's worth, Microsoft also offers Windows CE for mobile devices.

Instead, Microsoft has told people to simply wait for more details during its annual Mix web and media development conference in Las Vega, Nevada.

Significantly, Microsoft is not sharing any information ahead of that event through the Mix web site, with all sessions on mobile carrying the same "More to come. Stay tuned," message. The company has not outlined what to expect from sessions on Silverlight.

If Silverlight is destined for Windows phones, it's been a long-time coming.

In 2008, Microsoft promised The Reg that Silverlight for mobile would arrive in the first-quarter of 2009 along with manufacturers porting Silverlight to and distributing Silverlight with Windows and non-Windows mobile devices. Only Nokia has committed, with the S60, as Microsoft has kept working on Silverlight for mobile.

Silverlight serving as Microsoft's platform for mobile has it's advantages. It would certainly support the kind of slick and polished interface for Windows smartphones Microsoft's chief executive Ballmer showed off, with buttons, sliders, touch and gesture for video, and audio and data-based applications. The current experience of Silverlight provides scaling, cropping, streaming, and crystal-clear deep zooming on pictures and text on the PC.

Silverlight 3, released last year, delivered the ability to work offline and run outside the browser without an additional download. It also offered support for touch-based input that's also been a feature of Windows 7, along with a set of new data-oriented grid controls. This came with the existing ability to detect bandwidth for stutter-free streaming and support for the H.264 and Advanced Audio Coding (AAC) audio.

Silverlight fits into Microsoft's belief in what it calls the "natural user interface." This interface idea includes support for manipulation and gestures, ideas that have been put on the mobile map by Apple's iPhone.

Microsoft's runtime has plenty of attraction for Microsoft developers already targeting PCs and servers, developers who are potentially interested in mobile. Silverlight lets you re-use existing skills and code, as Silverlight apps are coded using Microsoft's Visual Studio.

Reg reviewer Tim Anderson wrote last year that Silverlight 3 is closer to what client-side .NET should have been: lightweight, high-performance, cross-platform, and supported by a rich graphical user interface framework that takes a sane approach to layout.

But there are some un-answered questions that complicate the notion of Silverlight becoming the runtime for Windows phones and that Microsoft would need to tackle.

The big question is whether Microsoft would let Silverlight become just like its Windows operating system or even Adobe's AIR. That is: Will Redmond let its media player and interface technology talk to the hardware and draw on local data, turning Windows phones into more than just phones but pocket-sized computers?

In some ways, this is a part of larger question inside Microsoft of how far it should take Silverlight, which sprung of the Windows Presentation Foundation (WPF) for PCs. Should Silverlight be bulked up into a pseudo operating system that developers program to instead of Windows?

Interestingly, Microsoft will use Mix to draw a distinction between Silverlight 4 and WPF 4 Touch APIs at Mix.

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