On the file menu, click info When you try to open a excel workbook, powerpoint presentation, or word document on your mobile device, you might receive a message stating that the file is locked for editing by another user. If you don't want content reviewers to accidentally change a word document or an excel spreadsheet, you can use formatting and editing restrictions
If you don't want content reviewers to accidentally modify your document, you can make the document read only before sending it for review In powerpoint, select protect presentation Another method is to restrict formatting and editing.
Select protect document > mark as final In excel, select protect workbook
