Internet Explorer has been used by approximately 95 percent of Web surfers since June 2002, according to WebSideStory, a San Diego Web metrics company.
Recently, however, its dominance has begun to erode slightly, due in part to a number of well-publicized IE security vulnerabilities and a generally favorable reception to Firefox, a slimmed-down browser developed as part of the open-source Mozilla project.
Increasing pressure from alternative browsers such as Firefox and Opera will ultimately cause Microsoft to take a second look at the browser and how it can better be used to leverage Microsoft's monopoly, Andreessen says.
"Microsoft is certainly going to respond competitively to these things. I can guarantee that," he says. "I think that it is quite possible that this is going to get very interesting over the next two or three years," he says.