Jim Allchin, co-president of Microsoft, told the press that Windows Vista won't feature a built-in anti-virus solution. Instead, Microsoft will sell anti-virus protection through its OneCare online backup and security service.
Symantec, though its assisted enquiries from investigators, has said it would rather take on Microsoft in the marketplace than cry foul to regulators over Microsoft's entry into the consumer anti-virus marketplace. McAfee has made no suggestion it's about to object to Redmond's encroachment on it traditional turf, either. So it seems Microsoft has either decided anti-virus technology is better delivered as a service or else figured out that's a better business model to pursue.