Karen,

I have never done that but in AOL automatically everytime I send an e-mail or receive one, that address is stored somewhere because when I start typing the address it'll pop up. In Hotmail when I send an e-mail to a new person it asks me if I want to store it as a Hotmail "contact" and I say yes and it stores it.
Do you know if these are "address books" also subject to hijacking by a virus?