Window 8

Microsoft's Windows 7 with the infamous "Metro UI" added.

The correct name is with the singular form of "window", because Metro only has one window.

See: Useless

Windows 1. 1985: Multitasking, windows. Close/minimize/maximize buttons.

Windows 2 1988. re-sizable, movable windows.

Windows XP 2001: Pretty blue windows.

Windows Vista 2007: Transparent windows, flip-3d.

Window 8 metro 2012: No separate windows or any form of multitasking, no close button, no resizing. Can only do one thing at a time.