I want to configure Outlook to auto accept or auto decline meeting
requests AND include a response in the Accept or Decline message body.
(One message for Auto Accepts; another for Auto Declines). Also, I
want to do this for MY calendar, not for any "resources" I manage. (I
don't manage any resources; I simply want to automate the management
of my Accepts and Declines.)

I don't think there's any way to do this within Outlook itself, and
thus far, I haven't been able to find an Add In (free or paid) that
enables this.

Is anyone aware of an add in or a way to do this?

Many thanks.