In addition to its service with the French Air Force, the M.S.406 was also exported to a range of customers. Out of 160 airplanes ordered by Poland, none had reached Polish territory before the outbreak of war, with the first part of delivery sent on 29 August 1939. Of particular note was its service in the hands of Finnish and Swiss air forces; both operators chose to develop their own indigenous models, such as the Finnish "Mörkö-Morane"). By the end of the war, the majority of M.S.406s and its derivatives were out of service, having been rendered obsolete in comparison to rapid advances in fighter aircraft technology. Its final use was as an advanced trainer aircraft in Finland, prior to the last examples of the type being scrapped during 1952.