Microsoft, "1 in 300 computers has malware"

http://www.cio.com/blog_view.html?CID=21951

Quote:

Microsoft’s data is remarkable because it comes from such a large sample group, the more than 270 million users of the Windows Malicious Software Removal Tool, which ships with Windows.

Between January 2005 and March 2006, this tool was used to remove 16 million pieces of malware from 5.7 million computers. The software has been used to scan systems 2.7 billion times during this period, and on average, it finds something malicious about 0.32 percent of the time, or in one out of every 311 scans, according to Microsoft

Apparently, Microsoft is saying that their tool finds malware on only 1 of every 300 computers. I find this EXTREMELY hard to believe though. Considering how rampant virus are, how stupid users typically are, the number has got to be bigger than that. Any thoughts as to how Microsoft could come up with results like this?

Jam it back in, in the dark.