BenBenBen writes "The head of Microsoft's security business and technology unit states that Windows is never vulnerable until a patch appears, and that releasing patches is what causes exploits to be developed. Good quotes: 'We have never had vulnerabilities exploited before the patch was known', and '[he] could only think of one instance when a vulnerability was exploited before a patch was available'. Erm..."
If it happens once, it's a bug. If it happens twice, it's a feature.
If it happens more than twice, it's a design philosophy.