A Federal court ruled that Microsoft violated U.S. antitrust law by abusing its computer operating system monopoly. Judge Thomas Penfield Jackson ruled that Microsoft violated parts of the Sherman Act antitrust statutes in relation to three of the four main charges brought against the company. "The court concludes that Microsoft maintained its monopoly power by anticompetitive means and attempted to monopolize the Web browser market," was the summary of the courts 43 page ruling. The courts finding will lead to the consideration of penalties designed to prevent future antitrust violations. Microsoft promised to appeal the ruling.