No, not all microwaves have doors that open inwards. The majority of microwaves on the market have doors that open from left to right, like a traditional oven door. However, there are also microwaves available with doors that open downward, similar to a conventional oven or a drawer. These are often called "microwave drawers" and are designed to be installed under countertops or in kitchen islands for convenience and space-saving purposes. So, depending on the model and design, microwaves can have doors that open in various directions.