Well microsoft IS the company that makes windows afterall the most used OS in the world, almost every computer in the world is using it.
Why is Nintendo's share price the highest? Is it because Japan is the most in debt nation or it's the most bought stock? Sony also makes various media products like DVD players, cameras, TVs so it must be a brand popularity thing. Also, Dow Jones and Software are on Microsoft's tabs too meaning there's a lot going on that they are involved with. Probably receives materials from Dow Jones for their products.