SAN JOSE, Calif. - Bill Joy, a Sun Microsystems Inc. co-founder who most recently served as the computer hardware & software maker's chief scientist, is leaving the company. Joy joined Sun in 1982.

"For 21 years, I've enjoyed the opportunities for innovation provided to me at Sun, but I have decided the time is now right for me to move on to different challenges," Joy said in a statement released Tuesday. Joy's duties will be handled by Greg Papadopoulos, Sun's chief technology officer.

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