Abstract: A system for mounting a microwave or other appliance to the underside of a cabinet includes an under-cabinet mounting assembly. The mounting assembly is made up of a plurality of inside the cabinet support members, an under-cabinet base plate, an appliance mounting plate and a plurality of fasteners. First fasteners are engaged to and extend from the plurality of inside the cabinet support members to fixedly engage the under-cabinet base plate. A second plurality of fasteners are engaged to and extend from the under-cabinet base plate to the appliance mounting plate. A third plurality of fasteners are engaged to and extending from the appliance mounting plate to the appliance. The system may also include a wall mountable rear support assembly for supporting the rear and or bottom surfaces of the appliance.