To stop spreading viruses to others when you use outlook or outlook express just put [email protected] as the first address in your address book. Since this address can not be resolved if you do get a virus it wil stop with you and not spread to any other addresses in your address book.
Its a good suggestion and I do use it. It just seems every week microsoft is putting out a security patch to one component or another. I used to use netscape for that reason but found it didn't behave well on some sites and I had to go back to IE.