The Microsoft Office developer tools in Visual Studio represent just one of many ways to extend Office applications. Office applications also have some built-in features, such as the Open XML Formats, that are not covered by the Office developer tools in Visual Studio or this documentation.
If you want to learn more about the possibilities offered by Microsoft Office and the Office developer tools in Visual Studio, these resources will get you started.
The central portal to information about Office Business Applications (OBAs). OBAs connect Line of Business (LOB) systems with the people that use them through Microsoft Office applications, so you can expand on existing IT investments by combining your resources in innovative ways.