Bill Gates, chairman and CEO, Microsoft: "The question is, can a successful American company continue to improve products for the benefit of its consumers? That's precisely what Microsoft did."
"Over the past 25 years, Microsoft has helped create a broad industry of literally thousands of companies that together made PCs more affordable, more widely available, more powerful and easier to use.
"Microsoft products are popular because we focus on our customers and innovate to meet their needs."
Ed Zander, president and chief operating officer, Sun Microsystems: "We always thought that Microsoft was a monopoly, and that it had exhibited business practices that violated the rules of what monopolies are about," "Right now, I think [the findings are] good for free enterprise, so I think it's a good day for competition."
George Vradenburg, senior vice president of global and strategic policy at America Online: "The judge's finding -- that Microsoft has a monopoly in operating systems and is maintaining its monopoly position through its business practices -- has profound significance and implications.
"The critical issue now is how to structure a speedy and effective remedy that protects consumers, increases competition and innovation and, importantly, prevents Microsoft from maintaining or using its monopoly power in the future."
Marc Torres, president of SuSe, one of the largest Linux distributors worldwide: "Look at the Gateways, Dells, and Compaqs who have been threatened with increased licence fees if they put on the wrong Office suite.
"I hope this will allow for more aggressive alternative marketing without Microsoft and allow vendors to operate without fear."
Ransom Love, CEO and president of Caldera Systems: "Hallelujah!"
Nancy Pomeroy, director of corporate communications at Caldera Systems: "It's what we alleged all along and we look forward to getting [Microsoft] in front of a jury."
Mitchell Kertzman, CEO of Liberate and former chief executive of Sybase: "I don't think that Microsoft is going to change its behaviour and that things won't really change until the rest of the case plays out.
"I'm a little concerned that people will think that Microsoft did this stuff in the past and the industry changed and that there won't be punishment."