Incredibly important for Microsoft, Nokia and even the carriers - who want to assert a bit of their own domination in the game. Windows Phone 7.5 is much better than any version of Android I've seen and very different from anything else out there. After using it for a few hours I decided I preferred Apple's interface and I'm deeply linked with their infrastructure and ecosystem - Windows Phone does not make a lot of sense for Mac users. That said, Windows Phone has the potential of working well for many. The ecosystem is lacking at this point, but Microsoft and others will be hammering away on it. If you aren't embedded in things like iTunes and use Windows on your PC - or if you are upset with Android - I'd give it a try.