Was Microsoft an illegal monopoly that engaged in abusive practices during the late 1990's and early 2000's? The debate as to whether Microsoft was an illegal monopoly continues to this day. Microsoft has received much media coverage surrounding the legal cases both in the United States and Europe. This media coverage and some of the initial legal findings concluded that Microsoft was an illegal monopoly with abusive practices. The frequency of this assertion has resulted in a de facto belief in its truth in some circles. However, others cite subsequent legal decisions as well as new developments in the industry over the past decade to assert that Microsoft was not an illegal monopoly, but merely a successful innovator. These advocates believe that Microsoft has a place in history, that it was central to both the PC and the Internet revolutions and that the monopolistic fervor against Microsoft in the 1990s is a cautionary lesson about judicial overreach in a business sector the courts do not understand. The research paper reviews arguments on both sides of the controversy.