Well, the question is what are they using? And is it available to "Joe User"?
Ah, they at least give a hint as to what they are using:
"But being one of the top people at the world's top software company has its perks. Ballmer said only about 10 junk e-mails make it through to his inbox each day because of Microsoft's anti-spam technology."
Given that Ballmer presumably receives in the order of 100,000s of spams a day, that means a 99.99+% spam capture ratio. That pretty much means that he is using the same Microsoft anti-spam technology as Bill Gates: "practically an entire department at the company he founded is dedicated to ensuring that nothing unwanted gets into his inbox."
So Microsoft's anti-spam technology is about as low-tech as it can get. It's a bunch of people that go through millions of E-mails each day.
-Scott
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