I did a lecture earlier this week about the design behind VSTO 3.0 Ribbon. This is the follow-up post with detailed information and a complete demo. Presentation: download Demo project: download In order to run the demo, open it in VS2008, build the setup project and install it, then run Word 2007. How to extend the Office 2007 Ribbon? In order to define a custom ribbon, you should construct an xml file that describes the controls you want to present there. For example, a ribbon xml file can be like...