While its gleaming, state-of-the-art, 30-story office tower in downtown San Jose, Calif., hardly looks like the staging ground for what could be called a full-scale cyber crime offensive, security experts have found that a relatively small firm at that location is home to servers that serve as a gateway for a significant portion of the world's junk e-mail.

The servers are operated by McColo Corp., which these experts say has emerged as a major U.S. hosting service for international firms and syndicates that are involved in everything from the remote management of millions of compromised computers to the sale of counterfeit pharmaceuticals and designer goods, fake security products and child pornography via email.

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