Microsoft was accused of being monopolistic for multiple reasons, one of which is that they made and sold computers with their own software installed. By bundling their Windows operating system with computers, Microsoft was able to dominate the market and restrict consumer choice. This practice gave them an unfair advantage over competitors who did not have their software pre-installed on computers, making it difficult for other companies to compete fairly.
Additionally, Microsoft did not share its technology with competitors, which further solidified their position in the market. By withholding important information and technology from others, Microsoft prevented fair competition and hindered innovation in the industry.
In summary, Microsoft's practices of bundling their software with computers and withholding technology from competitors were key reasons they were accused of being monopolistic. These actions limited competition in the market and allowed Microsoft to maintain a dominant position in the industry.