EXHIBIT 24

LIMITED POWER OF ATTORNEY

For Section 16 Reporting

The undersigned, as a Section 16 reporting person of Sun Microsystems, Inc. (the “Company”), hereby revokes all Powers of Attorney granted prior to the date hereof in connection with his/her Section 16 Reporting responsibilities, and hereby constitutes and appoints Michael A. Dillon, in his role and capacity as corporate secretary, Brian M. Martin, in his role and capacity as assistant corporate secretary and Irma Villarreal, in her role and capacity as assistant general counsel, and each of them, the undersigned’s true and lawful attorney-in-fact to:

1. complete and execute Forms 3, 4 and 5 and other forms and all amendments thereto as such attorney-in-fact shall in his or her discretion determine to be required or advisable pursuant to Section 16 of the Securities Exchange Act of 1934 (as amended) and the rules and regulations promulgated thereunder, or any successor laws and regulations, as a consequence of the undersigned’s ownership, acquisition or disposition of securities of the Company; and

2. do all acts necessary in order to file such forms with the Securities and Exchange Commission, any securities exchange or national association, the Company and such other person or agency as the attorney-in-fact shall deem appropriate.

The undersigned hereby ratifies and confirms all that said attorneys-in-fact and agents shall do or cause to be done by virtue hereof. The undersigned acknowledges that the foregoing attorneys-in-fact, in serving in such capacity at the request of the undersigned, are not assuming, nor is the Company assuming, any of the undersigned’s responsibilities to comply with Section 16 of the Securities Exchange Act of 1934 (as amended).

This Limited Power of Attorney shall remain in full force and effect until the undersigned is no longer required to file Forms 3, 4, and 5 with respect to the undersigned’s holdings of and transactions in securities issued by the Company, unless earlier revoked by the undersigned in a signed writing delivered to the Company and the foregoing attorneys-in-fact.

IN WITNESS WHEREOF, the undersigned has caused this Limited Power of Attorney to be executed as of this 10th day of August, 2004.

Signature: /s/ Robert Long

Print Name: Robert Long

LONG ROBERT LIVINGSTON 5