Microsoft's Windows Phone could become the No. 2 operating system in the world behind Android by 2015, with a market share approaching 17%, IHS iSuppli says. The research firm predicts that Nokia's Lumia line of phones will become a major hit, especially the 900 model, which will launch in the U.S. this spring. Also, Nokia says it will enter the Chinese market by July with the introduction of a Windows Phone 7 handset, a move that could make the company among the first to bring the software into the country.

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