Three people accused of scamming Microsoft Corp. by buying sharply discounted software intended for educational institutions and reselling it to nonacademic customers were convicted on conspiracy and fraud charges, federal prosecutors said.

Mirza Ali, 59, and his wife, Sameena Ali, 52, of Fremont, Calif., and Keith Griffen, 55, of Oregon City, Ore., were convicted in Oakland, Calif., federal court last month.