On the "monopoly" definition: fair enough.
And yet only about 40% of people in the US use it (according to this study which seems relatively legit http://royal.pingdom.com/2012/04/23/current-status-of-the-browser-wars/).
"Only" 40% of people in the US use it? Why does even 4% use it? Free market logic is "the company that makes the best product destroys the companies that make awful products," but as far as browsers go it seems the situation, rather, is "good products exist alongside awful products" and ironically the worst product is actually doing the best, according to the link you posted.
Microsoft is TRYING to create a monopoly with IE by forcing it on all of their users (there was actually a lawsuit back in the day about this)
How is Microsoft forcing IE on their users? By having it installed on computers? That's like saying they're forcing Solitaire on me because I have it installed. You have the choice to not use IE and it literally takes one minute to install another browser.