I agree. But maybe they were thumbing-down Microsoft itself, for the DUMBEST user interface you could imagine. Is there a Review -> Password menu option? No, that would be too obvious a place to put the password enabling/removal. So it's under Review -> Protect Workbook then? No, again, that would sort of make sense. So obviously Microsoft struck that one out. Nope, it's under Prepare -> Encrypt Document. But wait, isn't encryption a whole other level of security to simple password access? When people see the term "encryption", a simple password locked-door doesn't spring to mind; rather a complete alteration of the encoding of the underlying file structure. So that's where they put it - a place where no-one expects it!