Microsoft would do well to incorporate anti-spam controls and anti virus/anti malware/anti adware into Vista Windows. If I were MS I would offer all Vista buyers a power pack of the above for $25 that would seamlessly mesh with the OS. That would be a no brainer to deploy, same as the recent Apple operating systems.
No MS would do better to incorporate *fewer* things into windows thats their problem, too many things built in with too much room to do damage.