Another way to dispose of your old microwave oven is to give it away for free to someone who would benefit from it, such as a family member or friend. However, this is dependent on the state of your microwave oven. If it is unsafe or no longer works, organising a professional white goods removal service, or taking it to a recycling centre is a better idea.
Alternatively, you could give it to someone in need by donating it to your local charity store. For example, the British Heart Foundation accepts heating and cooking appliances along with other white goods so long as they are in fit condition and meet certain eligibility criteria, such as containing certain labels and passing certain safety checks.
Top tip: What charity stores can accept varies depending on their storage capabilities, demand and facilities, so it is a good idea to call ahead and check whether they accept it before you go to drop it off.