I always thought it was bad to put metal things in a microwave oven, and indeed on the occasions when something metal did go in ours some vicious sparking ensued.
Now we have a new one, a so-called combination microwave oven, and it includes a metal grill rack that can be used when it's microwaving. The instructions merely warn not to allow metal obejects to touch the sides when in a microwave mode.
So what has changed to make it OK to put metal in a microwave oven?
Daniele