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CEO Steve Ballmer doesn't want to raise Microsoft's bid for Yahoo, preferring to begin a proxy fight for control over Yahoo's board instead. But it's likely he'll have to soon offer more anyway. According to the WSJ, proxy fights rarely result in wins for the aggressor. Since 2001, only five of 27 such battles resulted in board seats for the hostile bidder. As a result, suitors raised their bids in 63 percent of all hostile approaches over the last five years.