Microsoft has made available the first developer training kit of its upcoming Mobile Operating system, Windows Phone 7 Series. It is covering essentials and basic parts of development starting with “Hello World” application.

It is introducing Microsoft Visual Studio 2010 Express, Expression Blend and procedures required to build and design applications for Windows phones and how to deploy and debug your Windows Phone application on the Windows Phone Emulator.

And also covering Game Development with XNA Framework, as well as to the basics of XNA Game Studio game development.

Windows Phone 7 Training Kit for Developers – RTM Refresh