Office 12's release date might still be up in the air, but at this year's Professional Developer's Conference Microsoft unveiled a handful of screenshots. If nothing else, they're interesting. Microsoft has completely ditched the menubar/toolbar interface they've stuck with for nearly 20 years. Its replacement is a series of tabs at the top of the window each of which reveals a different toolbar. It's a novel concept, but will it lead to increased productivity or frustration and hours lost to relearning? Office 12 also sports a new chrome look that matches what we've seen in Windows Vista and Internet Explorer 7 screenshots.