Internet Explorer is the No 1 browser for downloading a new browser. In 2003 IE had over 60% of the market. If you ever have a question about IE check out http://en.wikipedia.org/wiki/Internet_Explorer. The mighty browser has made plenty of new attempts only to fail to great browsers like FireFox and Google Chrome.
A big part of the problem with IE is its lack of html and css standards, security permission problems, and not working in Linux. IE9 has forced us to make hacks in websites to lower the security to IE8 permissions to allow certain java scripts to do their job. And they are already in the works on IE10 to fix all of those problems.
To see the decline of Internet Explorer take a look at these stats: http://www.w3schools.com/browsers/browsers_stats.asp.