I seriously doubt IE did much for the adoption of the world wide web. By the time IE made a dent, WWW was already a huge success and obviously growing rapidly. Being (eventually) pervasive it almost certainly introduced some people to the internet, but if it hadn't been MS it would have been someone else.

I bet the adoption was faster that it would have been if microsoft hadn't integrated IE. Of course, if microsoft hadn't integrated IE it's quite possible company would have died by now (or been a footnote of desktop computing history - like IBM). They didn't really have much of a choice.