In Office 2007, the Ribbon could not be customized.

In Office 2010, you can customize the Ribbon to add new buttons, new tabs or new groups.  You can also rename the existing tabs and groups to suit your needs.

To add a new tab or group to the ribbon:

1. Click the File tab.
2. Click Options to open the Word Options screen.
3. Select the Customize Ribbon category on the left.