ADX Extensions for Outlook   
http://www.office-addins.com

The ADX Extensions for Microsoft Outlook allows you to customize the Outlook folder view and Outlook forms by embedding feature-rich .NET and VCL forms and controls into the Outlook Explorer and Outlook Inspector windows. The ADX Extensions for Outlook is based on the Outlook windows architecture and helps you create a custom Outlook folder view and custom Outlook forms in a more comfortable way than the Digital Dashboard technology (Outlook Today) or Windows API. Now you can use any .NET and VCL forms, controls and components (such as grids, editors and tree-views) on the Outlook Explorer and Outlook Inspector windows like form regions provides by Outlook 2007. The ADX Extensions for Outlook supports projects written on Visual Basic .NET, C# and Delphi in Visual Studio 2003, Visual Studio 2005, Borland Delphi 5 - 2006.