I base my logic on the fact that Microsoft has consistently failed to make a mark on the mobile market. And that their eco-system is generally based on a monopoly - and closed (not as much as Apple).

Sure Nokia will bring a lot of ideas to the table - but they have never created a WM device - and thus they have no skilled engineers.

It's all win-win for M$, Nokia licenses their OS, they train their engineers with MS software, and their will be other companies creating apps for MS (good for Microsfoft).

Nokia on the other hand will have to rely solely on MS, and have no other high-end OS for their phones.

The only winner is MS.

I DO understand this from a other perspective - but it's clear Google were begging Nokia to come to them.

If Nokia wanted they could EASILY twist googles arm and have 50% input on the direction of the platform. WP7 is unproven - and this is a safe bet based on their previous attempts.