How will IE9 maintain momentum?

Unless you live under a rock, you must have noticed that Microsoft released Internet Explorer 9 this week. I have been using IE9 since the first platform preview, and I think it's a very solid browser, outclassing every previous Microsoft browser by far. Microsoft finally built a browser which is capable of competing with other modern browsers. The global consensus seems to be that Internet Explorer has regained serious momentum. Now I wonder how Microsoft plans on maintaining that momentum. IE9...