IE7 To Require XP Service Pack 2, No Win2K Support

BetaNews | Microsoft: No IE7 for Windows 2000
With Internet Explorer 7 Beta 1 set to debut next month, Microsoft has quietly closed the door on Windows 2000 users planning to adopt the new Web browser. IE7 will require Windows XP Service Pack 2 due to internal security changes that rely on Microsoft’s latest operating system release.

They really do want to drive those upgrade dollars.