From an interview in USA Today (tries to open a pop-up)
Q: Speaking of security, Internet Explorer has had well-publicized holes …
Gates: Understand those are cases where you are downloading third-party software.
Well, yes. IE's holes could well be described as "where you are downloading third-party software".
The problem is that it's when IE is letting nasty people send you software that you don't actually want to have…
Gates: More has been invested in making IE secure than any [sic] browser on the planet by a long shot. Nothing is going to change. That's the one over 90% of people are going to keep using.