The Microsoft Office system can be extended in a number of ways. Visual Studio Tools for Office offers tools to support the Microsoft .NET Framework and managed code. Microsoft Office also has some built-in features that you can access directly, such as the Open XML Formats, that are not covered in this Visual Studio Tools for Office documentation.
If you want to learn more about the possibilities offered by the Microsoft Office system to help you develop solutions, these resources will get you started with information and examples.
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.