The short answer is yes, but with an asterisk. Not all countertop microwaves are automatically designed to be reconfigured as a built-in model. If you’re thinking about installing a microwave on a countertop or as part of a wall oven configuration, you’ll need to make sure that the model you want is meant to support built-in installation. You’ll also need to purchase a separate trim kit so that it matches your kitchen decor or the look of your wall oven.