Frank:
If that is a dedicated circuit for the micro-wave it should not have to be GFCI protected, and if it is a single contact device.
From your post it doesnt sound if it is going to be moved often or unplugged.
My understanding of GFCIs for countertops is because of portable appliances and the majority are two wire receptacles, ergo the gfci requirement.
It would seem to be a real pain to make that single receptacle gfci especially if it trips then the micro-wave must be removed just to rest it.
In my area we are not requierd to make a receptacle of that nature gfci because of this inconvenience.
Mark.