Exhibit 31.1
CERTIFICATION
I, Jonathan I. Schwartz, certify that:
| 1. | I have reviewed this Amendment No. 1 to quarterly report on Form 10-Q/A of Sun Microsystems, Inc.; and |
| 2. | Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report. |
Date: February 11, 2008
| /s/ JONATHAN I. SCHWARTZ |
| Jonathan I. Schwartz |
| Chief Executive Officer |