My guess is that since they had most Windows boxes in the bag, they didn't really need to throw resources at that department to innovate. Search is really, real

My guess is that since they had most Windows boxes in the bag, they didn't really need to throw resources at that department to innovate. Search is really, really hard, and expensive. They had a built-in market, and it's cheaper to grow the market with one big deal than improve your product incrementally.