Citigroup Inc. and Microsoft Corp. have signed up for the consulting services of Infrastructure Defense Inc., a company that helps organizations defend against terrorism, fraud, and other threats, such as the year-2000 conversion.

"It is critical to our future," said P. Michael Nugent, Citigroup's general counsel for technology and intellectual property. "An important element of information security is protection of critical infrastructure from all manner of attacks and compromise."

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