FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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(Print or Type Responses)

1. Name and Address of Reporting Person * MacGowan William N   2. Issuer Name and Ticker or Trading Symbol SUN MICROSYSTEMS, INC. [JAVA] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) Chief HR Officer & EVP (Last) (First) (Middle) 4150 NETWORK CIRCLE 3. Date of Earliest Transaction (Month/Day/Year) 07/27/2008 (Street) SANTA CLARA, CA 95054 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 07/27/2008   A(2)   28,125 A $ 0.0007 40,134 D   Common Stock 07/27/2008   F(3)   3,352 D $ 10.43 36,782 D   Common Stock 07/28/2008   F(3)   735 D $ 9.94 36,047 (4) D

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Underlying Securities (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Employee Stock Option (Right to Buy)	$ 74.32							(1)	04/18/2009	Common Stock	3,750		3,750	D
Employee Stock Option (Right to Buy)	$ 65							(1)	06/13/2009	Common Stock	1,250		1,250	D
Employee Stock Option (Right to Buy)	$ 31.64							(1)	09/27/2009	Common Stock	4,500		4,500	D
Employee Stock Option (Right to Buy)	$ 50.36							(1)	11/07/2009	Common Stock	7,500		7,500	D
Employee Stock Option (Right to Buy)	$ 50.36							(1)	11/07/2009	Common Stock	7,500		7,500	D
Employee Stock Option (Right to Buy)	$ 36.56							(1)	03/19/2010	Common Stock	50		50	D
Employee Stock Option (Right to Buy)	$ 36.56							(1)	03/19/2010	Common Stock	3,750		3,750	D
Employee Stock Option (Right to Buy)	$ 14.8							(1)	07/25/2010	Common Stock	10,000		10,000	D
Employee Stock Option (Right to Buy)	$ 16.8							(1)	05/21/2011	Common Stock	7,500		7,500	D
Employee Stock Option (Right to Buy)	$ 16.832							(1)	11/13/2011	Common Stock	10,000		10,000	D
Employee Stock Option (Right to Buy)	$ 15.6							(1)	04/30/2012	Common Stock	75,000		75,000	D
Employee Stock Option (Right to Buy)	$ 15.16							(1)	07/29/2012	Common Stock	25,000		25,000	D
Employee Stock Option (Right to Buy)	$ 15.4							(1)	07/28/2013	Common Stock	75,000		75,000	D
Employee Stock Option (Right to Buy)	$ 17.04							(1)	07/27/2016	Common Stock	100,000		100,000	D
Employee Stock Option (Right to Buy)	$ 20.4							(1)	07/31/2017	Common Stock	100,000		100,000	D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
MacGowan William N 4150 NETWORK CIRCLE SANTA CLARA, CA 95054			Chief HR Officer & EVP

Signatures

/s/ William N. MacGowan		07/29/2008
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	This option vests and becomes exercisable in five equal annual installments beginning on the first anniversary of the date of grant.
(2)	This includes performance-based restricted stock units in which the award criteria was satisfied in 2007. Upon satisfaction of the award criteria, 25% of the underlying shares vested immediately and 25% of the underlying shares shall vest on each anniversary of the date of grant thereafter. The reporting person's Form 4 filed in connection with the initial vesting of this performance-based restricted stock unit award did not include the report of the unvested portion, which is now being reported.
(3)	This represents the surrender of shares to the issuer upon the vesting of time-based restricted stock units to satisfy tax withholding obligations.
(4)	This includes 2,063 shares of unvested restricted stock and 18,750 shares of unvested restricted stock units.

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