I loved IE6 as as user when it came out, and grew to hate it as a developer when the browser standards moved on, but a stubborn, large-enough user base percentage had not. I blame slow-moving IT departments that refused to touch their internal environments when all the Web 2.0 progress made things new and scary. A product my team was in charge of had to support IE6 and IE7 years after the rest of the world moved on because the IT admins at Walgreens straight out refused to update the machines that the pharmacists used at their stores.