We received an inquiry from Ricardo Calina which asked if FolderShare (Diary item here) was  "used on the new MSN Live Messenger ?". After an inquiry to Microsoft about this and related questions (where else may it be, is it default enabled anywhere?) we received an answer that said "The one in MSN Messenger is different." and "FolderShare is not installed by default in any systems.".

Thanks for the question Ricardo, and MS, thanks for the answer!