United States of America v. Microsoft Corporation, 253 F.3d 34 (D.C. Cir. 2001), was a landmark American antitrust law case at the United States Court of Appeals for the District of Columbia Circuit. The U.S. government accused Microsoft of illegally monopolizing the web browser market for Windows, primarily through the legal and technical restrictions it put on the abilities of PC manufacturers (OEMs) and users to uninstall Internet Explorer and use other programs such as Netscape and Java.

At the initial trial which began in 1998, the United States District Court for the District of Columbia ruled that Microsoft's actions constituted unlawful monopolization under Section 2 of the Sherman Antitrust Act of 1890, but the U.S. Court of Appeals for the D.C. Circuit partially overturned that judgment in 2001. The two parties later reached a settlement in which Microsoft agreed to modify some of its business practices.

History By 1984 Microsoft was one of the most successful software companies, with $55 million in 1983 sales. InfoWorld wrote:

Softletter estimated that in 1986 Microsoft had 8% (more than $250 million) of total revenue of the top 100 microcomputer software companies. Of the 15 million Americans who used a personal computer in their job, more than 90% used MS-DOS. Gates said in 1984 that applications such as Multiplan and Word were InfoWorld said, "not a big-time operation", but by 1987, Richard A. Shaffer of Technologic Computer Letter compared the company's dominance of operating systems, and consequent benefit to its application software, to a baseball game in which "Microsoft owns all the bats and the field". The Federal Trade Commission began an inquiry in 1990 over whether Microsoft was abusing its monopoly in the PC operating system market. The commissioners deadlocked with a 2–2 vote in 1993 and closed the investigation, but the Department of Justice (DOJ), led by Janet Reno, opened its own investigation later that year, resulting in a settlement on July 15, 1994, in which Microsoft consented not to tie other Microsoft products to the sale of Windows but remained free to integrate additional features into the operating system. In the years that followed, Microsoft insisted that Internet Explorer (IE) was not a product but a feature that it was allowed to add to Windows, although the DOJ did not agree with this definition.

The government alleged that Microsoft had abused monopoly power on Intel-based personal computers in its handling of operating system and web browser integration. The central issue was whether Microsoft was allowed to bundle its IE web browser software with its Windows operating system. Bundling the two products was allegedly a key factor in Microsoft's victory in the browser wars of the late 1990s, as every Windows user had a copy of IE. It was further alleged that this restricted the market for competing web browsers (such as Netscape Navigator or Opera), since it typically took extra time to buy and install the competing browsers. Underlying these disputes were questions of whether Microsoft had manipulated its application programming interfaces to favor IE over third-party browsers. The government also questioned Microsoft's conduct in enforcing restrictive licensing agreements with original equipment manufacturers who were required to include that arrangement.

Microsoft argued that the merging of Windows and IE was the result of innovation and competition, that the two were now the same product and inextricably linked, and that consumers were receiving the benefits of IE for free. Opponents countered that IE was still a separate product that did not need to be tied to Windows, since a separate version of IE was available for Mac OS. They also asserted that IE was not really free because its development and marketing costs may have inflated the price of Windows.

Bill Gates himself denied that Microsoft was a monopoly, stating "Microsoft follows the rules. Microsoft is subject to the rules." He further compared the situation with IBM thirty years prior: "People who feared IBM were wrong. Technology is ever-changing."

District Court trial The case was initially tried before Judge Thomas Penfield Jackson at the United States District Court for the District of Columbia. The suit began on May 18, 1998, with the Department of Justice joined by the Attorneys General of twenty U.S. states and the District of Columbia. The case organized by the Department of Justice was focused less on interoperability, and more on predatory strategies and market barriers to entry; the DOJ built upon the allegation that Microsoft forced computer makers to include its web browser as a part of the installation of Windows software.

Bill Gates was called "evasive and nonresponsive" by a source present at his videotaped deposition. He argued over the definitions of words such as "compete", "concerned", "ask", and "we"; certain portions of the proceeding would later provoke laughter from the judge when an excerpted version was shown in court. Businessweek reported that "early rounds of his deposition show him offering obfuscatory answers and saying 'I don't recall' so many times that even the presiding judge had to chuckle. Many of Gates's denials and pleas of ignorance were directly refuted by prosecutors with snippets of e-mails Gates both sent and received." Intel Vice-president Steven McGeady, called as a witness, quoted Paul Maritz, a senior Microsoft vice president, as having stated an intention to "extinguish" and "smother" rival Netscape Communications Corporation and to "cut off Netscape's air supply" by giving away a clone of Netscape's flagship product for free.

A number of videotapes were submitted as evidence by Microsoft during the trial, including one that demonstrated that removing Internet Explorer from Microsoft Windows caused slowdowns and malfunctions in Windows. In the videotaped demonstration of what then-Microsoft vice president Jim Allchin stated to be a seamless segment filmed on one PC, the government noticed that some icons mysteriously disappeared and reappeared on the PC's desktop, suggesting that the effects might have been falsified. Allchin admitted that the blame for the tape problems lay with some of his staff. "They ended up filming it—grabbing the wrong screen shot," he said of the incident. Later, Allchin re-ran the demonstration and provided a new videotape, but in so doing Microsoft dropped the claim that Windows is slowed down when IE is removed. Mark Murray, a Microsoft spokesperson, complained about the government attorneys "nitpicking on issues like video production." Microsoft later submitted a second inaccurate videotape into evidence. The issue was how easy or difficult it was for America Online users to download and install Netscape Navigator onto a Windows PC. Microsoft's videotape showed the process as being quick and easy, resulting in the Netscape icon appearing on the user's desktop. The government produced its own videotape of the same process, revealing that Microsoft's videotape had conveniently removed a long and complex part of the procedure and that the Netscape icon was not placed on the desktop, requiring a user to search for it. Brad Chase, a Microsoft vice president, verified the government's tape and conceded that Microsoft's own tape was falsified.

When the judge suggested that Microsoft offer a version of Windows that did not include Internet Explorer, Microsoft responded that the company would offer manufacturers a choice: one version of Windows that was obsolete, or another that did not work properly. The judge asked, "It seemed absolutely clear to you that I entered an order that required that you distribute a product that would not work?" David Cole, a Microsoft vice president, replied, "In plain English, yes. We followed that order. It wasn't my place to consider the consequences of that."

Gates and his successor as CEO Steve Ballmer were so worried about the outcome of the case that they discussed leaving Microsoft "if they really screw the company that badly, really just split it up in a totally irrational way," Gates recalled. Microsoft defended itself in the public arena, arguing that its attempts to "innovate" were under attack by rival companies jealous of its success, and that government prosecutors were merely their pawns. A full-page ad appeared in The Washington Post and The New York Times on June 2, 1999, created by a think tank called The Independent Institute. The ad was presented as "An Open Letter to President Clinton from 240 Economists on Antitrust Protectionism." It said in part, "Consumers did not ask for these antitrust actions – rival business firms did. Consumers of high technology have enjoyed falling prices, expanding outputs, and a breathtaking array of new products and innovations. ... Increasingly, however, some firms have sought to handicap their rivals by turning to government for protection. Many of these cases are based on speculation about some vaguely specified consumer harm in some unspecified future, and many of the proposed interventions will weaken successful U.S. firms and impede their competitiveness abroad."

Judgment Judge Jackson issued his findings of fact on November 5, 1999, holding that Microsoft's dominance of the x86-based personal computer operating systems market constituted a monopoly, and that Microsoft had taken actions to crush threats to that monopoly, including applications from Apple, Java, Netscape, Lotus Development, RealNetworks, Linux, and others. On April 3, 2000, Jackson issued his conclusions of law, holding that Microsoft had engaged in monopolization, attempted monopolization, and tying in violation of Sections 1 and 2 of the Sherman Antitrust Act.

On June 7, 2000, the District Court ordered a breakup of Microsoft as its remedy. According to that judgment, Microsoft would have to be split into two separate units, one to produce the operating system and one to produce other software components. Microsoft immediately appealed the judgment to the D.C. Circuit Court of Appeals.

Appeals Court decision After Microsoft filed its appeal, the U.S. government and the states in the suit filed a petition for certiorari before judgment, a process that would skip the intermediate Circuit Court and send the case directly to the U.S. Supreme Court. Such an action is permitted by a section of the United States CodeUnited States v. Microsoft Corp., 253 F.3d 34, 48 (D.C. Cir. 2001) that gives the Supreme Court jurisdiction to hear direct appeals from the District Court level in certain antitrust cases initiated by the federal government, if "the district judge who adjudicated the case enters an order stating that immediate consideration of the appeal by the Supreme Court is of general public importance in the administration of justice." The states also filed a petition for certiorari before judgment at the Supreme Court, requesting the same direct appeal process without going through the Circuit Court. The Supreme Court rejected these requests and sent the appeal to the D.C. Circuit Court.

On June 28, 2001, the Circuit Court overturned Judge Jackson's rulings against Microsoft. This was partly because Jackson had improperly discussed the case with the news media while it was still in progress, violating the code of conduct for American judges. The Circuit Court judges accused Jackson of unethical conduct and determined that he should have recused himself from the case. Thus the Circuit Court adopted a "drastically altered scope of liability" due to Jackson's conduct, which was favorable for Microsoft.