You also need to take into consideration, that a lot of users just don't have a skill to upgrade any application. For example, my parents: I installed FF3 of th

You also need to take into consideration, that a lot of users just don't have a skill to upgrade any application. For example, my parents: I installed FF3 of their computer, set Google as homepage and told them that when they want to go to the internet, they need to click the orange icon, and write to the google box where they want to go. I wanted to go further, but then I realised that they don't even have a clear concept of what is the difference between Internet, Google and Web browser...and you want them to upgrade browser? ;) I think out of those 25% IE6 users, there is a large portion of users like this.