A few weeks ago a friend of my son invited many of her school friends to a party via an internet site that promised to inform everyone. Indeed, emails were delivered to everyone. The emails contained attachments. Most everyone opened the attachments. Most everyone's computers got infected and commenced delivering mail to everyone in their contact lists in MSN.
Everyone, that is, but my son.
He knew my message of "don't open attachments in email unless you are very sure." That message was drilled into the family the earliest age. He ignored the first email about the party--probably didn't want to go anyway. He ignored the scores of emails from all his "friends" which were generated and propagated by the malware on their machines. He smiled when he told me all this.
He is, however, chagrined to report that the only way his friends and their parents could stop the deluge of outgoing emails was to shutdown the machine. Further, he hears that some of the machines will no longer work. That cuts into their collaborative game playing (Football Manager).