Originally HTC HD2 was a Windows Phone 6.5 device but now the guys over at the XDA Developers have ported the latest version of Windows Phone onto the HTC HD2, Windows Phone 7 Mango. While Microsoft never allowed such an upgrade, some tinkerers have managed to get the beta version of Mango — the next release of Windows Phone 7 — running on that HD2.

Microsoft will be releasing Windows Phone 7 Mango for all Windows Phone 7 devices, but the company has no plans to release an update for older Windows Phone 6.5 devices, but it looks like they don’t have a problem with developers porting the OS to older devices.

Source All Things D, XDA Developers