Separate tickets with Air Mauritius are very expensive and travellers heading to Mauritius will in most cases choose cheaper airlines. However, it occasionally happens that Air Mauritius has quite good fares from Europe (also in cooperation with other airlines) to, for example, the island of Reunion, where it also flies. It is generally not worth buying tickets directly through the airline's website, but rather through search engines.
However, you will definitely come across Air Mauritius if you are heading to the remote island of Rodrigues in Mauritius. It can only be reached virtually by plane, with a return ticket from the main island costing around 202 eur.