CommandBars in Microsoft Outlook have been replaced by the ribbon component of the Fluent user interface. If accessed, the ...

CommandBars in Microsoft Outlook have been replaced by the ribbon component of the Fluent user interface. If accessed, the Explorer.CommandBars and Inspector.CommandBars properties will return null. To customize the user interface in Outlook, use the IRibbonExtensibility object and the RibbonX extensibility model.