In Nokia's decision to go WP7 the element that makes least sense is to not port Qt to WP7.

The point of Nokia buying Qt was to commoditize the OS, so that apps would not be so tightly coupled to - say - symbian.

Windows mobile market share is sinking, and unless the first WP7 phone from Nokia is a huge hit, it is highly unlikely that WP7 market share will ever make it into double digits. And the chances of the first wp7 phone being a hit are slim - it will have problems - it usually takes 2-3 iterations to get something new like that right.

So Nokia must have a plan B. Obviously they cannot publicly announce it as it would signal lack of confidence in plan A, but it must exist.

And this is the weird part: How will they be able to move to another platform if all the apps are silverlight-based?

If Microsoft decides sometime in 2012 or 2013 to abandon WP7, Nokia will be (very far) up **** creek.

Had Nokia insted crafted the agreement with Microsoft so that porting Qt to WP7 was part of it, they would, in my view, be far better off.

I imagine that there have been hard diskussions on this subject internally in Nokia, and I hope that some of the (somewhat encouraging) announcements we have seen around Meego in the last two weeks, are expressions of these discussions.