The reason why HTC HD2 is called the "magic machine" is that it can basically brush all tablets in the current market except iOS. Just a few days ago, it was reported that HD2 successfully ran WP8 system. Today, there is another god on the foreign altar XDA who successfully brushes Windows RT (tablet system running on Surface RT) into HD2. The following is a screenshot of the XDA Forum:

It looks very cool. If any netizen happens to have this magic machine and has something special to toss about, you can try to brush off this system to play. Alas, I really regret that I didn't choose this phone!