Microsoft is upgrading Windows Explorer in Windows 8 by replacing traditional menus and toolbars with a ribbon interface.
The ribbon interface is the biggest of several changes intended to make Windows Explorer more efficient for common activities, which Microsoft research indicates are currently performed primarily from the context (right-click) menu or keyboard shortcuts.
Thanks to an incomplete selection of options, Windows Explorer's buttons and menus account for less than 15% of all user operations, including copying/moving, viewing properties, renaming, and creating/deleting.
Microsoft concentrated primarily on those common operations in designing the Windows Explorer ribbon's Home tab. The percentages listed for each button indicates how often the operation is expected to be performed.