Looks like Microsfot is being a softy and allowing support for the Internet Explorer 6 browser to continue. Its true not everyone likes to upgrade to Internet Explorer 7 yet since its still beta. But it could be that they are already using Firefox instead of IE6.
Its good that they are not going to force feed users with this browser like how it treats the OS offerings.

Support for the five-year-old Internet Explorer 6 browser won’t vanish overnight when the new IE 7 debuts later this year, Microsoft assured users on Thursday. Security updates for the older IE will continue to be produced and released, said Christopher Vaughan, a lead program manager for the browser team, in a blog entry.

“IE 6 SP1’s [Service Pack 1] support policy will not change when IE 7 ships. Everywhere that IE 6 SP1 is supported today, IE 6 SP1 will continue to be supported until the OS it ships with expires,” wrote Vaughan. “If you’re running IE 6 for Windows XP Service Pack 2, you can stay with that version of IE for as long as Windows XP SP2 is around.”

The edition of IE most in danger of disappearing from the support list is IE 6 SP1 running on Windows XP SP1, since that version of Windows will be purged Oct. 10. Vaughan also reminded users that they won’t be forced into upgrading to IE 7. “Of course, we hope our users will upgrade. But if you don’t want to move, you won’t have to. We will continue to keep our IE 6 customers secure for those of you who can’t or don’t upgrade to IE 7.”