Probably because if you believe that web apps are where the future is, then Microsoft's business model is severely screwed because they have no products that co

Probably because if you believe that web apps are where the future is, then Microsoft's business model is severely screwed because they have no products that compete in that space, they don't control it (despite IE market share), and they have continuously demonstrated that they don't understand it. Maybe buying Yahoo is part of their attempt to kill the web app future. Maybe buying Yahoo is a brilliant move, not an act of desperation.