British tech publication V3.co.uk recently posted an article with the headline Third of anti-virus vendors fail to protect Vista. 

The latest tests conducted by independent anti-virus testing organization Virus Bulletin have revealed that 12 out of 35 top security vendors failed the stringent VB100 test which pits security systems against the publicly available WildList of malware known to be circulating. Products must be able to detect 100 per cent of the malware, and must not generate any false alarms when scanning a clean set of files,

In the V3.co.UK article John Hawes of Virus Bulletin said that Microsoft came out "top on the proactive side by a whisker, and pretty good on the reactive side", highlighting the significant time and resources Microsoft is putting into security under its Forefront brand.