IBM widened its lead in the worldwide server market in 2003 at the expense of Sun Microsystems, making particular gains in the Unix server market, new figures show. In Unix servers, No. 3 IBM saw revenue grow 13 percent to $4.1 billion. Revenue for first-place Sun shrank 16 percent to $5.4 billion, while No. 2 HP saw revenue shrink 4 percent to $5.3 billion. The overall Unix server market shrank 4 percent to $16.7 billion, while the Linux server market grew 90 percent to $2.8 billion, Gartner said.