Re: Oh, the irony!
From Ars Techica: "The Kaspersky figures are illuminating because they show Windows 7 x64 Edition, which is widely used by large organizations, being infected close to twice as much as Windows 7 versions mostly used in homes and small offices. It's not clear if that means enterprises are less likely to patch or if there are other explanations."
I'd say homes and small offices have auto-updates turned on, big businesses don't.
Glad I'm not on that team at work.