SANTA CLARA, Calif., March 4 /PRNewswire-FirstCall/ -- Sun Microsystems, Inc. today announced that it holds the leading position in UNIX (R) disk storage systems shipped for calendar year 2004, according to IDC's Q4 2004 Worldwide Quarterly Disk Storage Systems Tracker. Sun also increased its UNIX market share for units shipped by taking share away from both IBM and HP.

"This is further evidence that Sun is strengthening our position in the UNIX market at the expense of HP. HP continues to become more vulnerable in the storage space as the company erodes the position it inherited from Compaq," stated Mark Canepa, executive vice president of Sun's Network Storage Products Group. "This IDC data shows that our focus on building a comprehensive storage portfolio that meets our customers' needs is paying off."

In addition to the strong performance in the UNIX market, Sun Network Storage continues to solidify its storage position by growing its market share for units shipped in the total disk storage systems market by .8 points in 2004.

About Sun Microsystems, Inc.

Since its inception in 1982, a singular vision -- "The Network Is The Computer" -- has propelled Sun Microsystems, Inc. to its position as a leading provider of industrial-strength hardware, software and services that make the Net work. Sun can be found in more than 100 countries and on the World Wide Web at http://sun.com/ .

FOR MORE INFORMATION Larkin Kay Alexander Ogilvy for Sun Microsystems, Inc. 303-634-2658 larkin.kay@ogilvypr.com

CONTACT: Larkin Kay of Alexander Ogilvy, +1-303-634-2658, or larkin.kay@ogilvypr.com, for Sun Microsystems, Inc.

Web site: http://sun.com/