[gvnonor]

Android is open source, but that isn't reason enough to rip off someone else's UI. Atleast Microsoft's innovating and not just copying stuff wholesale(which admittedly it used to do a lot in the past).

Regarding opportunity, the MS store will very likely be the biggest opportunity for software developers in a decade. There are more than 500 million Windows 7 users, and assuming that only 20% of those people upgrade, devs will still have a 100 million strong customer base.