I did a job for a rather large company that was hit by the love letter worm. The guy that brought it in had about 600 people in his address book. He had in turn given all 50 of the people in his dept a copy of his address book. The dimwit admin for the company had not updated NAV in about 3 months prior to the hit. I did a little simple math and found out that close to 30,000+ people recieved the letter.