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America's best-known female boss, Marissa Mayer of Yahoo, is in the firing line following revelations that the company had suffered the worst security breech in US history - and they'd kept it secret for nearly two years. Whether she can keep her job remains in doubt, but the crisis has spurred Lucy Kellaway of the Financial Times into some reflections about the challenges facing any female chief executive. (Photo: Marissa Mayer. Credit: Chip Somodevilla/Getty Images)