I’m pleased to announce that the Windows Phone SDK 7.1 RTW release is now available on the Microsoft Download Center for immediate download and update.

Windows Phone SDK 7.1

The existing SDK has allowed developer to create and publish apps optimized for Windows Phone 7.5 since August. The Release to Web (RTW) release consists of seven additional release languages, final finishing touches to the tooling experience, a handful of bug fixes, and additional upgrade logic to provide a better installation process for users coming from earlier tools. In total, the RTW release is available in the following nine languages:

With this release, we recommend/ask that Windows Phone developers do the following three things…

1. Download and install the WPSDK 7.1, updating either your WPDT 7.0 RTW or WPSDK 7.1 pre-release installations
2. For already submitted apps (7.0 or 7.5), it’s worth checking into your App Hub account and cross-submit your apps to make them are available in the new WP7.5 markets
3. If you haven’t submitted your Windows Phone 7.5 app yet, it’s a great time to get it going; folks are excited and updating their phones – let your app light up on Mango!
   (If you already built and submitted your
   Windows Phone 7.5 app using the RC tools, you don’t need to do anything – there is no need to recompile and/or resubmit – it’s all good )

The Windows Phone SDK 7.1 and the corresponding developer platform
underlying Windows Phone 7.5 is the result of a ton of great feedback from
developers over the past year. Of all these updates and changes, I would like to
highlight my favorite five things that have resulted from your feedback:

1. With MIX11, we launched the WPDev Feedback site on the UserVoice platform as a
   place for developers to post suggestions and capability requests; yesterday, we
   reskinned the site to use the new Windows Phone chrome, and we will start
   providing more feedback on submitted suggestions starting next month. If you
   haven’t already, head over there and file your suggestions
   and feedback for future releases!
2. With the Beta 2, we provided developers with a program to get a pre-release ‘Mango’ update on their
   retail phones. This has enabled our developer base to build and test their
   apps in time for Windows Phone 7.5 consumer release
   (yesterday!).
3. The tools are more widely available: 4 additional languages supported in
   WPSDK 7.1, and now also available for install via the Web Platform Installer (WebPI) client and using WebPI's Contextual Installation
4. The tools now include some great new capabilities:
   • NuGet
     allows you to easily keep your plug-ins and code library packages up to
     date
   • The profiler just plain kicks – who doesn’t love being able to see where
     performance bottlenecks are occurring in their apps?
   • Time to market for apps has been significantly decreased and first pass
     rates increased with the inclusion of the Marketplace Test Kit
   • The emulator supports the ability to feed in location and accelerometer
     data, as well the ability to take screenshots
   • The Microsoft Advertising Ad Control is now included as
     part of the WPSDK installation (and now available in 11 countries outside the
     US)
5. The underlying developer platform includes a massive number of API changes
   and capabilities that developers have been asking for (background agents; fast
   app switching; Silverlight 4; XNA/Silverlight Interop; what is there not to love
   here?)

More information at :

Windows Phone SDK 7.1 Now Available!
http://windowsteamblog.com/windows_phone/b/wpdev/archive/2011/09/28/windows-phone-sdk-7-1-now-available.aspx

Kindest regards,

João Ribeiro