According to this Washington Post article, the nation’s largest ISPs are responding to the recent escalation of email viruses (Blaster and SoBig.F) innundating customer accounts by planning to implement scanning applications to screen all attached documents. With as many as half of all incoming emails infected with viruses, AOL, Comcast, Microsoft, and Covad have already begun scanning, while EarthLink and BellSouth have indicated they plan to do so this fall. The process is costly, on both the IT side as well as in terms of additional customer support requirements.