Microsoft's Windows Phone operating system made a strong push in the first quarter to emerge as the third-largest smartphone platform in the U.S., while BlackBerry's market share sank by 81% compared with a year ago, according to research firm Kantar Worldpanel's survey. Windows grew by 52% to a 4.1% share, while BlackBerry plummeted to 0.7%, says Kantar, which points to sales of Nokia's Lumia 920 as boosting Microsoft. Android grew to hold a 51.2% share of the market while Apple's iOS slipped to 43.5%.

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