![]() In a COM add-in targeting Outlook, you can add custom option pages to the Tools | Options and Folder Properties dialogs.Ī COM add-in also handles events and calls properties and methods provided by the object model of the host application. A COM add-in supporting Outlook, Excel, Word or PowerPoint can show advanced task In a Word document and perform some actions on the selected objects. ![]() Say, a COM add-in can show a command bar or Ribbon button to process selected Outlook emails, Excel cells, or paragraphs COM add-ins is the only way to add new or re-use built-in UI elements such as commandīar controls and Ribbon controls. IDTExtensibility2 interface (it is a COM interface, of course). COM add-ins have been around since Office 2000 when Microsoft allowed Office applications to extend their features with COM DLLs supporting the
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