App Stores: Microsoft, Google Follow Apple

Suddenly, the cell-phone app store market is getting crowded. Can rivals grab share from the maker of the iPhone?

When Apple (AAPL) opened its iTunes App Store in July, the idea of a mass-market Web site that sells downloadable games, tools, and other applications for cell phones was a rarity. Handset owners could buy apps from their carriers or the occasional niche site. But these days, the app store concept is becoming commonplace. The question is, does the world need a warren of wireless app stores?

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