As Windows Phone app developers, we were waiting for this release with expectation , we had the Windows Phone 7.0 SDK, the Windows Phone 7.1 SDK and the update to 7.1.1 that allows you to work with 256-MB Devices.
Later in October 2012 we had the release of the Windows Phone 8.0 SDK, but we were still waiting for the 7.8 version (As you know 7.5 devices can be updated to the version 8.0, you will have only the version 7.8 available for your Mango device).
But finally, today 23rd of January, we have available to download the Windows Phone 7.8 SDK that can be downloaded from here.
What’s in the update?
If you want to add the new Windows Phone 8 Live Tile functionality to your Windows Phone 7.1 App to run it on WP7.8 or WP8.0, I recommend you to use this community project to light up your applications very quick: http://mangopollo.codeplex.com/
Enjoy it and happy coding!