When the former chair of Enron, Kenneth Lay, sent e-mails to his staff assuring them that the company's future was sound, he probably never thought about how these pieces of unstructured data could one day be used to indict him on 11 counts of fraud.

"There is an awful lot of intelligence potential locked up inside that unstructured data," wrote Nick Patience, managing analyst and cofounder of tech analyst The 451 Group in a November 2004 report.

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