Microsoft has an uphill battle against the iTunes App Store and Apple knows it. Today Apple announced that downloads from the iTunes App Store have topped two billion. This is an impressive number no matter what type of application it is that it being downloaded.
Of course some people will say that the iTunes App Store has gotten cluttered with crap (and this is true) but still 2 Billion downloads is a lot. Apple did not break out the details of the 2 billion but you can be sure that many of the apps are the free or "lite" versions that people grab before shelling out the money for the full version.
Still, no matter what, MS is going to have to rush to catch up, as of today they have a grand total of nine, seven games and two utilities. This is in contrast with the 85,000 in the App Store. Of course anyone that has browse through the App Store knows that a good number of that 85k is nothing but trash.