As he took the stage to usher Windows Vista to market, Microsoft CEO Steve Ballmer last week tried to put the software's laborious birth behind him. The company's 71,000 employees -- and the entire PC industry, for that matter -- could be excused for breathing a sigh of relief, too. "It's an exciting thing to finally be here, and that's probably all I'll say about the past," Ballmer said at the unveiling from Nasdaq's cylindrical high-tech building in New York's Times Square. Office 2007 and Exchange Server 2007 also were introduced, and 30 more products will follow over the next...