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Enjoy lots of advanced features for VSTO and VSTO (SE): customize Office 2007 Ribbon UI and Office 2003 toolbars at design-time and run-time, add elements to Ribbon tabs, the Quick Access Toolbar and Office Menu and validate the resulting Ribbon XML in no time. Use special components to create custom task panes, application-level keyboard shortcuts and to embed custom .NET controls into Office toolbars. If you develop plug-ins for Outlook, get Outlook-specific command bars, option pages, and the ability to embed custom .NET forms into Outlook Explorer and Inspector windows, including the complete replacement of a folder view with a .NET form like Outlook Today does.
Add-in Express 2007 is based on the security and deployment model of VSTO 2005 and VSTO 2005 SE, developed in C# and delivered with its source code. It completely supports application-level add-ins for Outlook, Excel, Word, PowerPoint, Visio and InfoPath, and works for Visual Basic .NET and C#.