Clever cookies on the XDA Developers forum have successfully ported a build of the upcoming Windows Phone 7 "Mango" platform to the HTC HD2, a phone that was originally bundled with Windows Mobile 6.5 and first announced two years ago.
In the video below you can clearly see the results for yourself, an HD2 running Windows Phone "Mango" without any noticeable lag or technical issues. It's hard to see whether they have managed to get all of the phone's features working, like the camera and connectivity, but it's a very promising glimpse of the future for anyone who is still rocking the awesome HD2.
The best part of this story is the response from Microsoft itself. In an interview with the Wall Street Journal, Microsoft spokesperson Bill Cox gave modders the thumbs up saying, "We say tinker away with Mango and enjoy the juice". He added only that users need to be aware that this sort of modding will void the phone's manufacturers warranty. But given that the HD2s in the wild are probably over 18 months old, warranty issues shouldn't be a worry for most.