The war between business models is over. Open source has won.
We are now negotiating terms of the peace treaty. Microsoft believes JQuery enhances the basic Visual Studio product. That's why they're using it.
When Microsoft needs open source software, and open source developers, to retain market share that's a very big deal. Someone just got embraced and extended, and I think it was Microsoft.
This does not mean Microsoft, or Nokia (which has also adopted JQuery), are going away. In the present business environment their cash hordes and market positions are stronger than ever.
But on the other side of the crisis it's an open source world.