It's possible; Windows Phone 7 Series shown running on an HTC HD2

The official Microsoft statement is that Windows Phone 7 Series will not be provided as an upgrade on the HTC HD2. However, developers just see that as a challenge and already have it running, several months in advance of release.
Written by Matthew Miller, Contributing Writer

Microsoft previously revealed that the fantastic HTC HD2 would note upgradeable to Windows Phone 7 Series, but the developers never seem to let statements like this get in their way. The HTC HD2 appears to have at least the minimum specs needed to run Windows Phone 7 and according to information posted over on Engadget Windows Phone 7 has already been ported to work on the HD2. The two YouTube videos are embedded below and as you can see it does run, but appears to be a bit laggy at the moment. We still have several months until WP7 release so I imagine this is a pretty early version of the OS as well.

The folks at XDA Developers are well known for customizing and optimizing HTC Windows Mobile devices. I especially found them useful for reinstalling ROMs that removed carrier junk from devices. I am not sure if I will be upgrading my own HTC HD2 to WP7 since I really like the media and other aspects that are supported on the device running WM 6.5. I can multitask, copy and paste, and load up apps from wherever I desire on my HD2 at the moment. Also, by the time we see WP7 devices released I am sure we will have even more amazing hardware.

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