OSX: More Bugs Than Windows, More Severe Than Vista

Larry Dignan and George Ou compared security warnings and severity between Windows XP/Vista and OSX. For sake of fairness, warnings affecting multiple versions (XP and Vista, 10.4 and Leopard) are counted once. The loser? Apple.
Mac versus Windows vulnerability stats for 2007:
[T]his shows that Apple had more than 5 times the number of flaws per month [...]