As far as i can tell, MS had a burst of energy, mostly in the grasping-capitalist mode (as opposed to the creative mode) back in the 80s and early 90s, and since then, almost anything they've done has been a flop. They dominate word processing after using the monopoly power of their IBM operating system to kill off the arguably better Wordperfect and rival database and bookkeeping software; but the Office suite and Windows has been one buggy kludge after another ever since they bumped off their rivals. Since then, it's been "Let's fight AOL," "Let's build a better search engine," "We promise to provide better security," "Let's take over the game industry," etc. And let us not forget all the wonderful hardware applications...
MS reminds me of IBM back in the early 80s: one great idea that they carefully manipulated to make the most money from, and then it got hit by the bus. I no longer own MS stock, and I may regret it when the new OS comes out, but I doubt it. From my point of view, I think they better hope that Jobs hasn't locked a bunch of people in the basement and told them to come up with a better PC-compatible OS, because if he has, MS could get a sunburn from the redlight going off behind the net.
JC