David L. Smith also was fined $2,500 by state Superior Court Judge Lawrence M. Lawson on the single count of computer theft.
The judge upheld a plea deal allowing the state term to end when the federal term does. That means the actual 10-year state term will end in 20 months along with the federal sentence.
Smith, 34, received the federal sentence Wednesday on a charge of knowingly spreading a computer virus. The arrangement that allowed Smith to serve both sentences at the same time stems from plea bargains reached in December 1999 with state and federal prosecutors.
Smith could have received up to five years in prison on the federal charge, but U.S. prosecutors suggested a term of about two years, noting his "extensive assistance" in the three years since his arrest.
Authorities provided no specifics this week about his cooperation.
Smith told Lawson the virus was "a serious lapse in judgment," adding, "I have done everything I could to try and fix my mistake."
"Melissa" struck thousands of e-mail systems on March 26, 1999, disguised as an "important message" from a friend or colleague, and spread around the world like an electronic chain letter.
Melissa was relatively benign compared with viruses that delete computer files or do other damage. Yet by clogging e-mail systems and causing some to crash, Melissa was the worst computer virus outbreak ever at the time.
Smith was arrested a week after the virus surfaced, and in December 1999, he and prosecutors agreed the damage was greater than $80 million.
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