[pohl]

There's a legitimate reason for excluding the original iPad, though: it has to push four times the pixels as the iPhone 3GS, while still being limited by the same 256M of RAM that the 3GS has. Apparently at least one essential application (my guess would be Mobile Safari at least, probably many apps) couldn't provide an acceptable user experience within that constraint.

Perhaps there's a legit reason for the current Windows 7 phones, though. Does anybody know?

[MatthewPhillips]

I vote that "different kernel" qualifies as a legitimate reason too.

[robert_nsu]

Thank you. I'm glad someone else sees this. If a developer writes a NFC enabled app that finds its way on to previous generation phones, the support alone will be an utter nightmare.