Support for COM Add-ins
Microsoft Outlook allows you to enhance and extend the application using Component Object Model (COM) add-ins. A COM add-in is a dynamic-link library (DLL) that's specially registered so that it can be loaded by an Office XP application. You can build a COM add-in with a variety of languages, such as Microsoft Visual Basic and Microsoft Visual C++.
The COMAddIns property of the Application object gives you access to the COM add-ins loaded by Outlook.
Learn more about Customizing Outlook using COM add-ins.
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