Going to be picky here and clarify that Microsoft - and the small niche of people who run wikipedia - want people to call it ribbon. But anyone who's used major software from Lotus or KDE knows that tabbed toolbars are tabbed toolbars and Microsoft didn't invent them in 2007.
And from the bottom of the wiki page:
"The Microsoft Ribbon Licensing Page has been retired, therefore it is no longer possible to license the ribbon control from Microsoft."