I ran across this article on Engadget:
I have a great suggestion — change their slogan from “Friends don’t let friends use Internet Explorer 6” to like my shirt: “Friends don’t let friends use Windows!” That will get rid of IE6! Just kidding…
In all seriousness, I can’t help but wonder if delivering the browser with the OS has caused most of this issue. On top of that, new releases of Windows haven’t been as frequent as they could have been, and users didn’t have compelling reasons to upgrade.
Maybe one thing that might help is to finish the HTML 5 specification and give the users a compelling reason to upgrade their browser!