At its Mix 10 conference, Microsoft released free versions Microsoft’s Visual Studio 2010 and Silverlight 4 multimedia toolkit, both equipped with an emulator for the Windows Phone 7 OS. In addition, the company announced the availability of a beta version of Expression Blend 4, a GUI-oriented design and code-generating toolkit, which also includes Windows Phone 7 development tools.
However, Microsoft still has not answered a number of questions about third-party apps for the new phone OS, including questions about how it will structure its app store and how to integrate apps into WP7 hubs.
