The Scourge of IE6 Continues, for Some Surprising Reasons.
Why is Microsoft Internet Explorer 6 still the third most popular browser? The biggest reason organizations do not upgrade, according to this article, is that they are running third party applications that do not work properly with IE8. In fact, Gartner estimates that 40% of in-house applications do not work properly with IE8.
Another reason, since most social media sites do not work well with IE6, companies stay with IE6 as a form of URL filtering!! Of course, the security risks associated with this strategy far outweigh the benefits.