Sorry, just forgot. Now is in the list. By the way Yahoo use Norton in its mail service - scanning the files and mails. The program is good, but I have never used it. The thing I know about this AV program is that it takes to much resources. More than the others, without Panda and Kaspersky - the heaviest I know in this industry.
I've used Norton, but I am not going to recommend it. It is not for regular user. More for enterprices.