"According to company CEO Simon Clausen, "recent research conducted with statistics from over 1.4 million computers within the ThreatFire community has shown that Windows Vista is more susceptible to malware than the eight year old Windows 2000 operating system, and only 37 percent more secure than Windows XP." This certainly sounds dire, and at first glance, the company's numbers back its statements up. Data reports from the company's ThreatFire security program state that Vista allowed an average of 639 threats per 1,000 computers "through." Through, in this case, presumably means that the malware in question successfully installed itself and became active."

Look here for the dirt.

Could be an explanation may be, that attacks are more centered on the newer product release, rather than on Windows 2000? Still, does not help for confidence in Vista. Thanks-interesting!