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By extending a March 14 deadline for shareholders to nominate new board members, Yahoo CEO Jerry Yang thwarted Microsoft CEO Steve Ballmer's carefully orchestrated plan to make public what's so far been a behind-the-scenes proxy fight. Ballmer intended to announce a new slate of candidates for the board on March 13. Now Yahoo doesn't have to accept nominations until 10 days before it schedules its annual shareholder meeting. Yahoo could hold that meeting as late as July 12. Sources say Ballmer is pissed. "Ballmer is just one of many highly emotional people involved in this," a source told the New York Post. "Microsoft has been trying to avoid going completely hostile, but now it is going to get completely hostile." What's Ballmer going to do? Throw chairs at the meeting?