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Download the Windows Phone SDK 7.1 RC and use it to create mobile apps that target Windows Phone 7 and Windows Phone 7.5. The free WPSDK toolkit provides everything a WP dev needs to build and test a game or app.

The Release Candidate (RC) build allows developers to build their Windows Phone 7.5 apps with confidence that their apps perform as designed on the phone’s final OS release.

New to the RC (from Beta 2)

• The profiler has been improved, and now provides memory profiling as well.
• The emulator has a couple improvements to make development and testing better:
  • The RTM build (build 7720) is used by the emulator, providing you with confidence that the code you write will work on Windows Phone 7.5 retail devices.
  • A screenshot capability is now also built-in, allowing you to quickly capture images of your app in action.
• NuGet is now supported in the free Visual Studio 2010 Express for Windows Phone SKU, allowing you to easily keep your add-ons up to date.
• The latest build of the Microsoft Advertising SDK for Windows Phone controls are now included in the WPSDK, making it even easier to monetize your apps; particularly with more countries supported in 2011.
• The completed Marketplace Test Kit enables you to test your app for certification on your machine, running the same technical cert tests that the Marketplace team runs, which should dramatically improve your chances of passing the first time.
• For the first time, the WPSDK is available in Japanese, making the goodness of WPDev available to a new group of developers.

It’s worth noting that this release works fine with the pre-release builds of Zune and Windows Phone 7.5 that we released last month (build 7712). There have been no application platform changes between builds 7712 and 7720 of the OS, so devs should be fine continuing to use their devices with the WPSDK 7.1 until Windows Phone 7.5 is made available from their Mobile Operator.

‘Go Live’ License

Perhaps most importantly, the WPSDK 7.1 RC includes a ‘Go Live’ license, which empowers you to publish your apps to the Windows Phone Marketplace. In order to take advantage of the ‘Go Live’ license and publish, your apps must be compiled using the WPSDK 7.1 RC or RTW release. If you built your app using the WPSDK 7.1 Beta 2 Refresh released last month, it should be as simple as a recompile and test. If you built your code using one of the two betas, your code may require some additional tweaks.

The Road to RTW

With the RC released, we now start the march towards RTW (Release to Web). We will be releasing the final, RTW release of the Windows Phone SDK 7.1 towards the end of September. The differences between RC and RTW are expected to be minor – mostly visual tweaks and ‘fit and finish’. We will also be releasing the other localized versions of the WPSDK.