(Fortune Magazine) -- Motorola CEO Ed Zander was enjoying a moment of relief from his company's struggles last January, mingling with fellow corporate chieftains at the World Economic Forum in Davos, Switzerland, when he got the message that makes CEOs see their careers flash before their eyes. The news: Carl Icahn was calling him out. He had bought a 1.4% stake in Motorola and was demanding a seat on the company's board.