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In 2007, when Apple released the first iPhone, Symbian was powering an estimated 125 million mobile phones. Nokia used Symbian to power its smartphones until 2011 when it changed over to the Microsoft Windows phone OS — another potential market-leading product that did not live up to early expectations. The first generation of mobile computing products, Apple’s Newton and Psion’s Psion 3, both failed. It’s not easy, without the benefit of history, to figure out the new technologies that will succeed and the ones that are destined to fail.