WE PREVIOUSLY showed that about one in two PCs that run Microsoft Windows is a zombie PC.
Microsoft is to blame for spam. Almost all businesses that use Windows have a Botnet problem.
Up to 88% of Fortune 500 companies may have been affected by the Zeus trojan, according to research by RSA's FraudAction Anti-Trojan division, part of EMC. The trojan installs keystroke loggers to steal login credentials to banking, social networking, and e-mail accounts. [...] Smaller companies (those with fewer than 75,000 employees) appeared to have a higher proportion of infected employees.
My bet is that 100% of computer networks with Windows are infected and that the missing 12% are so well captured that those watching are unable to tell.
Blame for this universal failure can only be laid at Microsoft's feet. Either the whole world administers Windows incompetently, or Windows is hopelessly insecure. If it were possible to secure Windows, the majority of Fortune 500 companies would not have a problem. No other software has this kind of problem.
--Brian Valentine, Microsoft executive