I have an older 1989 model year microwave that needs to be replaced. I am unsure as to how it can be removed. Any help?

A. Unplug the unit (in cabinet above).
B. Remove the bolts that are screwed through the cabinet above the unit.
C. Remove the unit front panel that just pops off to expose the heads of two long bolts that bolt the unit through the unit to the wall bracket mount. Have someone hold and lower the unit when you unscrew these two bolts, as they are the primary holding bolts, and the unit will fall out into your hands due to its own weight.

Source: DIY Chatroom (http://www.diychatroom.com/f47/removing-over-range-microwave-wall-mount-14213/)