A spokeswoman for Microsoft, Kim Kurseman, e-mailed Ars this statement, and also declined further questions: “We have never engaged in the secret scanning of email traffic like what has been reported today about Yahoo.”

For its part, Google was the most unequivocal. Spokesman Aaron Stein e-mailed: "We've never received such a request, but if we did, our response would be simple: 'no way.'"

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