Yes the address was quite difficult to locate, but I finally found it one week ago: (but there is no european address - just found the japanese one)
The ANA Mileage Club Service Center
Retroactive Registration Section
P.O. Box 20, Gate City Osaki Post Office
Osaki, Shinagawa-ku, Tokyo 141-8411
[This message has been edited by wnedoe (edited 06-28-2002).]