Microsoft’s latest release for Windows Phone is out, long awaited with so many new features, Windows Phone 7.1 a.k.a MANGO.

Officially Windows Phone team has signed-off the RTM build for Windows Phone 7 MANGO.

The Mango update for current Windows Phone handsets will be ready this fall, and will come pre-installed on new Windows Phones.

Read More here  http://microsoftpowerpoint.org/phone-7-mango-code-released-to-microsoft-partners/ 

Expecting Soon final version of Windows Phone 7.1 SDK for Visual Studio also will be available for Developers.

Good reads

http://www.wp7connect.com/2011/07/27/developers-might-be-getting-their-hands-on-new-mango-build/ 

http://windowsteamblog.com/windows_phone/b/wpdev/archive/2011/07/27/wpsdk-beta-2-refresh-for-mango-devs.aspx