How is The Ribbon (trademark, whatever) different from the palettes in Adobe creative products that have been there since the early 90s, or the tool palettes any number of programs? The main difference seems to be that the Ribbon can't be moved or resized like those palettes, and its controls cannot be customized or changed.
Honestly, I don't see anything here that is conceptually different from, say, Superpaint circa 1990, or MacDraw Pro, or... sheesh. They all had dockable tool palettes with a combination of buttons, menus, and dialog box poppers. If you want fixed palettes of controls, go to (for example) Adobe Photodeluxe circa 2001.
I mean, I give credit to MS for realizing that menu bars were an early 90s solution to the problem of organizing software functionality, and a palette arrangement could expose more functionality on new displays with more pixel space. But others had come to that conclusion much earlier, and the fixed palette they call "The Ribbon" does not have new features that you would not find in any number applications that use tool palettes.