Since Microsoft announced its $44.6 billion bid for Yahoo on February 1, shareholders have filed six lawsuits against Yahoo CEO Jerry Yang and the rest of its board, according to the company's annual 10-K report. Two lawsuits from Michigan pension funds allege Yang and the board breached their duties to shareholders when they rejected Microsoft's bid. Two of four California plaintiffs, however, allege the board erred by supposedly favoring Microsoft's unsolicited proposal. Almost 27 million Yahoo shares traded hands today. Why didn't these complainers just sell their shares? That seems easier.