Before Microsoft used to be this tightly integrated system. You had Office only on Windows, all mobile apps come on Windows Phone first. Satya has changed the company quite a lot . Each division works as an independent unit, they compete. Another example of this was the dropbox integration into office. Clearly one of the reasons to use Skydrive was the easy integration into Office. With the new integration, Skydrive will have to compete on features instead of getting fed because of its integration with office. Waiting for the day when IE becomes cross-platform.