Yes, if you're short on time you can thaw frozen salami in the microwave. If defrosting slices of salami, I would microwave on the defrost setting in small increments - no more than one minute at a time. The slices can go from thawing to cooking very quickly so you'll need to keep an eye on them. For stacks or sticks of salami, you'll need to use small increments to make sure the outside doesn't cook before the inside is defrosted.