Huffingtonpost - "Thirteen years ago, in August 1998, I sat across a boardroom table from Microsoft co-founder Bill Gates for a deposition as part of the antitrust case brought against the company by the U.S. Department of Justice and 20 states. When the courts found that Microsoft had violated the law, the case showed the crucial difference between legitimate business competition, which the antitrust laws are intended to encourage, and illegal, strong-armed monopolistic practices which thwart competition and deter innovation."
tl;dr - Microsoft are d*cks, Google aren't.