In 1990, Microsoft became the first PC Software company to record more than $1 billion sales in one year. Michael Hallman assumed President and CEO of the company after the retirement of Jon Shirley. That same year, the U.S. Department of Justice started to investigate Microsoft Corp., regarding allegations of monopolistic practices in the PC software market.<ref>[http://library.thinkquest.org/22522/timeline4b_en.html Computer Chronicles]</ref> | In 1990, Microsoft became the first PC Software company to record more than $1 billion sales in one year. Michael Hallman assumed President and CEO of the company after the retirement of Jon Shirley. That same year, the U.S. Department of Justice started to investigate Microsoft Corp., regarding allegations of monopolistic practices in the PC software market.<ref>[http://library.thinkquest.org/22522/timeline4b_en.html Computer Chronicles]</ref> |