Microsoft's ribbon user interface made its debut in Office 2007 and has polarised user opinion ever since. Microsoft has used the ribbon interface in a growing number of applications and judging from leaked Windows 8 screenshots, it is going to integrate the ribbon motif in Internet Explorer.
Microsoft has been doling out early beta releases of Windows 8 to its employees, though a glut of screenshots have appeared on the web. A newfangled start screen that takes cues from Windows Phone 7 also tipped up, and while that is unlikely to draw much criticism, the ribbon user interface is somewhat more questionable.
Microsoft is well known for demonstrating features in Windows beta releases that disappear by the time the final product is released to manufacturing.