Did you make a lot of changes to the Office ribbon menu? Here's a quick way to reset the settings to their defaults.
Microsoft Office allows you to personalize the ribbon menu to ensure the quickest access to the commands you need to get the work done. However, if you made a lot of changes and want to start over, the apps (Word, Excel, PowerPoint, and Outlook) have an option to quickly reset the settings to their defaults for a specific tab or the entire ribbon experience.
Full story from the WindowsCentral blog...