After settlement talks collapsed this weekend, the United States Department of Justice and 20 states have filed closely related antitrust lawsuits against Microsoft. The lawsuits allege that Microsoft has illegally exploited its dominant position in operating systems to extend that dominance into the Internet software market. In addition, the lawsuit filed by the states accuses Microsoft of unfairly using its position to promote Microsoft Office at the expense of competitors. Microsoft has said that it will fight the charges in court, although Microsoft chairman Bill Gates said the company is still open to settling. For more details, see ZDNet’s "Special Report: U.S. v. Microsoft."