To decline a VIA3 Meeting invitation:
In the Meetings view, select the desired meeting and click the Decline button.
You may right-click on the meeting and select Decline from the context menu.
You may also click on the Decline button in the slide-in meeting notification
Note: If you do decline a
VIA3 Meeting, the Host receives notification via the change in the status of your
icon within that meeting’s People Pane. Your status changes from "Available"
to show that you have declined the meeting.