Over the past months, our compatibility team has been hard at work, finding and fixing bugs that cause site rendering issues. Due to the different release schedules for Windows 7 Beta and IE8 RC1, some of these bug fixes didn't make it into Windows 7 Beta (aka Build 7000). So, if you want to use the latest version of IE8 – you’ll want to install Intdernet Explorer 8 RC1 for Windows Vista or Windows XP,” Olivier explained.