There is a big surprise for all the Windows Phone 7 Series users. Some developer named tom_codon along with some Russian guys successfully managed to port Windows Phone 7 Series to HTC HD2.
He has posted some screenshots of HTC HD2 running Windows Phone 7 series. He mentioned that all the features like WiFi, Bluetooth etc are working absolutely fine. The only problem is with the graphics driver, which is not working properly and causes the device to lag.