A Delaware judge has unsealed details in a shareholder lawsuit against Yahoo for allegedly taking undue steps to block Microsoft's unsolicited bid for the company. You can see the lawsuit here at the site of Bernstein Litowitz Berger & Grossmann, the law firm suing Yahoo on behalf of shareholders, as well as the letter from the judge, William B. Chandler III, unsealing the suit. The main news revealed in the suit is Yahoo's own estimate of the cost of the employee severance package it had instituted after Microsoft's bid, a move seemingly intended to make the deal more expensive. How much more expensive? According to Yahoo's internal estimate, provided by an outside consultant it hired: $462 million to $2.1 billion at Microsoft's original offer of $31 a share. The plan gives all 13,800 Yahoo employees cash and accelerated stock grants in the event of a takeover and a change in their jobs.