I doubt that email spying or any other increased surveillance would stop the determined terrorists anyway, just the stupid terrorists, who probably aren't capable of pulling off coordinated attacks. And how long did Britain have to deal with IRA terrorism? There's been a war on terrorism long before GWBush took office, and nobody's been able to stop it, it just resurfaces in a different cloak. If you consider the number of people killed by terrorism in a particular country as an indicator of success or failure, GWBush has failed as one of the worst.