The folks at Microsoft have released build 7720 for their Windows Phone mobile operating system internally this weekend, a leaked version of this full upgrade to what's otherwise known as Windows Phone Mango available now. This is NOT an official release from Microsoft as it's only been sent out internally, within the company, that meaning of course NOT FOR YOU! But that doesn't hold back the folks at XDA Developers does it? I think not. Hackers rejoice, today you may load an early version of the final Windows Phone Mango build on your devices.