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"However, it seems it would make much more sense for Nokia to just fork Android, which is also a viable platform, and a more popular one at that. Also, it is free of cost, unlike WP7."I've seen WP7 run faster on remarkably little hardware - it's a lot like iOS in that sense. Where even Froyo would lurch and struggle, iOS and WP7 have been shown to make very snappy experiences out of relatively old hardware.
This can potentially lend a lot of hardware advantages. The current "we have N core in our phones!" race that HTC, LG, Moto, and Samsung are running in is in no small part due to the lackluster performance of Android. The only apparent solution is to throw more and more hardware at it (and to be fair, it's working, the latest generation of Android devices are finally as snappy as my pokey 500MHz iPhone).
But consumers don't care about their megahurtz or their cores. They want a snappy UI that works for them - if Nokia can create a better experience for less hardware, they pocket that difference. This can also confer spec-sheet advantages that customers do care about - e.g. battery life.
Secondly, as a "preferred partner" for MS, Nokia might have some say over where the platform goes. I think it's pretty safe to say that Google does what it wants with Android, and if Nokia wanted a feature they'd have to wait in line like everyone else. Given the poor sales of WP7 so far, I'm betting MS is willing to bend over backwards and Nokia may get to drive the platform development in a big way.