Firewalls still don't seem to be doing the job they are supposed to. New York-based MessageLabs studied some 5.6 billion e-mails from January to June this year - one in 12 contained some sort of virus that had just slipped past firewalls.
MessageLabs fear that a union between viruses and spam would introduce the profit motive to virus writing, and would provide an incentive for more professional quality viruses to be produced in future.
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