I didn't really think about this until I put the microwave in place (under the cabinet) and found that the built-in cord was too short.It seems this microwave was a known issue from the start (or was it?). Didn't you plan on a circuit and receptacle for it?
If it is in it's own place (as opposed to just sitting on the counter) it really should have a dedicated line. Can't you put a receptacle right behind the unit?
I suppose I could put a receptacle in the cabinet, behind the microwave. What is the proper way to do that? I assume I can't just run Romex thru the back of a cabinet, and even if I could, I wouldn't, since that's what the previous owner had done and I spent a long time removing the mess and running the wire thru the walls. Note that the cabinets form a peninsula, so there is no wall behind the microwave. Thanks.