Paul Thurrott gives us his views on the second beta version of Office 2007:
The main UI construct of the new Office user interface is the ribbon, a panel that runs along the top of each application window in place of the old menus and toolbars (Figure). At a cursory glance, you may mistake the ribbon as nothing more than a new-look toolbar, because it seems to contain some familiar icons and options. Don't be fooled. The ribbon has been designed, uniquely for each Office application, to expose the most commonly needed commands in a logical fashion. So, for example, when you first launch Word, you're confronted with commands related to fonts, paragraphs, styles, editing, and the Clipboard, because that's what most people need right away: They're going to write something.