title: Outlook add-in button on calendar overview
body: <p>Is it possible to add a button to the command ribbon for the calendar overview in outlook. The <a href="https://docs.microsoft.com/en-us/office/dev/add-ins/reference/manifest/extensionpoint#extension-points-for-word-excel-powerpoint-and-onenote-add-in-commands" rel="noreferrer">PrimaryCommandSurface</a> extensionpoint doesn't seem to be supported in Outlook add-ins. Adding a button to the appointment edit window isn't enough, because I need to perform an action for the whole calendar. </p>