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You're probably thinking of WP8, not RT.
I believe the lack of UEFI and TPM were the big reasons MS didn't support WP8 on WP7 devices.
RT was never targeted as a phone OS.
That RT can run on an HD2 should not be a big surprise.
Microsoft's initial testing of Windows on ARM was on such devices.
http://blogs.msdn.com/b/b8/archive/2012/02/09/building-windows-for-...
Well, you know, there is already code in there that's supposed to make this impossible. The guy just circumvented it all, and if Microsoft added more such code it'd just get circumvented as well sooner or later.
It was a logistical issue. Ensuring a smooth update from WP7 to WP8 for new devices, while taking care of data migration for two different OSes and figuring out a way to provision and update millions of existing devices without a hitch is no small feat. It is likely the resources to do so were not there to justify the gain.
Not that I agree with the decision, I think it was poor planning on Microsoft's part.





Member since:
2005-07-22
They were saying that for techical reasons phones that ran WP7 won't run Windows RT. This was always viewed with some suspicion.
I fully expect that either
- the developer will be perused in the courts
- they will put specific code in RT to stop this from happening again.
The game of cat and mouse begins.