In the past few days, Microsoft has started to push Mango updates (not RTM) with version 7712 to registered developers in the App Hub ). If you have never been invited to Mango Beta testing by Microsoft, you can apply directly to Microsoft.
Go to https://www.research.net/s/z95rkyzto enter some registration information in your app Hub. Then, Microsoft will send you a Mango Beta test invitation. You can get some tools and software related to Mango Beta upgrade from Microsoft's connect site to upgrade your Windows Phone to Mango. In addition, the partnership between Microsoft and Nokia Based on the Windows Phone system is about to be fully launched. On April 9, August 17, they will hold a joint press conference on GamesCom, Cologne, Germany, we expect to see the first Nokia Windows Phone at that time. The invitation letter shows that the content published at the meeting will be exciting and exciting. If you are on site, you will have the opportunity to win the first three Nokia Windows Phone devices.