It worked! For the benefit of others, here it is. In a table, a field with it's property as calculated (using MS Access 2010):
IIf([Status]="M" And [Gender]="M","M." & " " & [FirstName] & " " & [LastName] & ", " & "Membre",IIf([Status]="M" And [Gender]="F","Mme" & " " & [FirstName] & " " &...