Microsoft has made its Windows Phone 7.1 Release to Web (RTW) update available to developers.
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.
The previous version of the SDK allowed developers to build apps for Windows Phone 7.5 (Mango) and the RTW version adds tweaks to the tooling experience, bug fixes and an additional upgrade logic to provide a better installation process. It also includes seven additional release languages meaning it is now available in French, German, Italian, Japanese, Korean, Russian and Spanish.
Source: Download: Microsoft
