Office challenge: How to close all open files in Word 2007

This week, test your Word skills by solving the mystery of the disappearing Close All command in ribbon versions of Word.

Let's suppose one of your Word users has just upgraded to Word 2007. One of her favorite pre-ribbon commands was Close All. By holding down the Shift key and selecting Close All from the File menu, she could close all open Word files at once. Unfortunately, this no longer works in Word 2007 or 2010. Can you help her?