I remember thinking to myself a long time ago that Microsoft and Apple ran their own show and that Google was the middle player with a diversified OS environment. Consider that Google has apps for everyone, or at least a working form even if not official for MS and Apple products. With more recent releases of MS Office for mobile on Android, and with a previous lock screen app by MS for Android (no matter its level of popularity) it seems at least MS is trying to get their product to people even if it isn't on their own devices. I think it's a good thing to promote your products on other platforms and shows a team-player-type of attitude, or at the very least, a willingness to play well with others. I do question however, if MS limits itself at some point to its hardware being the differentiating factor after having released other versions of its core software suites, what would be left to draw customers in?