The MRU is not a Star Trek battle tactic -- it's a "Most Recently Used" list. Usually, it's good to have one. That way, you can open the "X" most recently used files from within the program. Like Word, for example. See how the File menu lists the last four edited documents? Isn't that convenient? Yeah, well... what happens when you've got something in there that you don't want anybody else to know about. Or, what if you don't want anybody to know what you've been working on lately? In Word, select Tools | Options | General. Then, take the checkmark out of the "Recently used file list" field. Follow the same procedure for Excel and PowerPoint.