Isn't Tena talking about a microwave that also has a convection oven in it, so you can do one or the other or both?
I have one of these (a Sharp) which also has an upper and lower grill, and you can use any combination of these. I've used the microwave+convection oven when i want roast potatoes quickly because the microwave (on low voltage setting) cooks them from the inside, while the convection (set to very high heat) gets them brown and crisp on the outside. I got it mainly so i could defrost food easily (it has a very good defrost function, based on type of food and weight) and also to have some extra oven space.But the double function turns out occasionally to be convenient. I admit i also occasionally will do chicken thighs that way when in a real hurry, and it's ok.