Nokia will not go with WP7.

The partnership with Microsoft would be only on Office integration.

However, it would be interesting to see they team up for some XBOX integration also. The future of making money on gaming seems more bright on mobile devices. Sony's amazingly hardware spec'ed NGP device (on Android platform) is already announced for this year end. And seeing that Microsoft couldn't even sell 2 million WP7 devices, it needs strong support from other handset manufacturers in this area now else it could be too late for them to compete in this handset-gaming-war. And as Nokia doesn't have a gaming platform of their own, this could be a win-win for both these companies.

Also, recently the unlimited Ovi Music service was stopped by Nokia. Who knows, there could be some collaboration between these 2 companies on their respective music services (Zune & Ovi Music).

Again, there is also a possibility that Bing can be the default search engine for Nokia phones!!

Feb 11th would clearly give directions on MeeGo. But personally I am just curious to know if they would choose Intel-Medfield or ARM-Cortex9 for the first MeeGo device.

So, to sum it up, Nokia will not leave Symbian & MeeGo. The partnership with Microsoft would be on some of their crucial services (office, gaming, music).

Feb 11th can't come any sooner!