Kungliga Vitterhets Historie och Antikvitets Akademien
Mälsåker was bought in 1943 by the Norwegian legation in Stockholm and the premises were used in the training of Norwegian police troops during World War II. In 1945, the roof caught fire and the manor burned. In 1951, a new roof was built. In 1993, the Royal Swedish Academy of Letters, History and Antiquities ("Vitterhetsakademien") initiated an extensive restoration. Since 2007 an association has been responsible for making the castle available to the public.