Download the Windows Phone SDK 7.1 RC and experiment with the latest tools release for Windows Phone. The Windows Phone SDK 7.1 RC provides the tools necessary to target the upcoming Windows Phone OS release codenamed Mango, and includes the “Go Live” license to publish your applications to Marketplace for use on phones with Mango, the Microsoft Advertising SDK for Windows Phone 7 and productivity enhancements such as an app profiler and an improved emulator.

The Windows Phone Software Development Kit (SDK) 7.1 provides you with all of the tools that you need to develop applications and games for both Windows Phone 7.0 and Windows Phone 7.5 devices. This download is the Release Candidate (RC) and provides a ‘Go Live’ license that enables you to develop and publish applications to the Windows Phone Marketplace.

Overview

The Windows Phone SDK includes the following
Windows Phone SDK 7.1 (RC)
Windows Phone Emulator (RC)
Windows Phone SDK 7.1 Assemblies (RC)
Silverlight 4 SDK and DRT
Windows Phone SDK 7.1 Extensions for XNA Game Studio 4.0
Microsoft Expression Blend SDK for Windows Phone 7
Microsoft Expression Blend SDK for Windows Phone OS 7.1
WCF Data Services Client for Window Phone
Microsoft Advertising SDK for Windows Phone