SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C.  20549

                                  SCHEDULE 13D
                    Under the Securities Exchange Act of 1934

                             Sun Microsystems, Inc.
            ________________________________________________________
                                (Name of Issuer)


                                  Common Stock
            _______________________________________________________
                        (Title of Class and Securities)

                                   866810203
            _______________________________________________________

                     (CUSIP Number of Class of Securities)

                               O. Mason Hawkins
                       Chairman of the Board and C.E.O.
                                     and
                             Andrew R. McCarroll
                       Vice President & General Counsel

                      Southeastern Asset Management, Inc.
                        6410 Poplar Avenue,  Suite 900
                             Memphis, TN  38119
                               (901) 761-2474
         ___________________________________________________________

         (Name, Address and Telephone Number of Person Authorized to
                     Receive Notices and Communications)


                              October 21, 2008
                  ___________________________________________
                        (Date of Event which Requires
                           Filing of this Statement)


If the filing person has previously filed a statement on Schedule 13G to report
the acquisition which is the subject of this Schedule 13D, and is filing this
Schedule because of Sections 240.13d-1(e), 240.13d-1(f), or 240.13d-1(g), check
the following box: [X]









CUSIP No. 866810203                                             13D
_____________________________________________________________________________
(1)  NAMES OF REPORTING PERSONS
     Southeastern Asset Management, Inc.      I.D. No. 62-0951781
_____________________________________________________________________________
(2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:
                                              (a)
                                              (b) X
_____________________________________________________________________________
(3)  SEC USE ONLY
_____________________________________________________________________________
(4)  SOURCE OF FUNDS
     00:  Funds of investment advisory clients
_____________________________________________________________________________
(5)  CHECK BOX IF DISCOSURE OF LEGAL PROCEEDINGS IS
     REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)                  [ ]
_____________________________________________________________________________
(6)  CITIZENSHIP OR PLACE OF ORGANIZATION
     Tennessee
_____________________________________________________________________________
                                   :(7) SOLE VOTING POWER
                                   :   (Discretionary Accounts)
NUMBER OF SHARES BENEFICIALLY      :      84,041,928 shares
OWNED BY EACH REPORTING PERSON     __________________________________________
WITH                               :(8) SHARED OR NO VOTING POWER

                                   :      58,476,000 shares (Shared)
                                   :      18,048,900 shares (No Vote)
                                   __________________________________________
                                   :(9) SOLE DISPOSITIVE POWER
                                        (Discretionary Accounts)
                                   :     102,019,178 shares
                                   __________________________________________
                                   :(10) SHARED DISPOSITIVE POWER

                                   :      58,476,000 shares (Shared)
                                   :          71,650 shares (None)
_____________________________________________________________________________
(11)  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

       160,566,828 shares
_____________________________________________________________________________
(12)  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11 EXCLUDES
      CERTAIN SHARES [X]
_____________________________________________________________________________
(13)  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11
       21.2 %
_____________________________________________________________________________
(14)  TYPE OF REPORTING PERSON
      IA
_____________________________________________________________________________




CUSIP No. 866810203                                             13D
_____________________________________________________________________________
(1)  NAMES OF REPORTING PERSONS
 	Longleaf Partners Fund			I.D. No. 63-6147721
_____________________________________________________________________________
(2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:
                                              (a)
                                              (b) X
_____________________________________________________________________________
(3)  SEC USE ONLY
_____________________________________________________________________________
(4)  SOURCE OF FUNDS
     00:  Funds of investment company shareholders
_____________________________________________________________________________
(5)  CHECK BOX IF DISCLOSURE OF LEGAL PROCEDDINGS IS
     REQUIRED PURSUANT TO ITEMS 2(d) or 29e)                  [ ]
_____________________________________________________________________________
(6)  CITIZENSHIP OR PLACE OF ORGANIZATION
     Massachusetts
_____________________________________________________________________________
                                   :(7) SOLE VOTING POWER

NUMBER OF SHARES BENEFICIALLY      :    None
OWNED BY EACH REPORTING PERSON     __________________________________________
WITH                               :(8) SHARED VOTING POWER

                                   :   58,476,000 shares (Shared)

                                   __________________________________________
                                   :(9) SOLE DISPOSITIVE POWER

                                   :    None
                                   __________________________________________
                                   :(10)  SHARED DISPOSITIVE POWER

                                   :   58,476,000 shares (Shared)

_____________________________________________________________________________
(11)  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

       58,476,000 shares
_____________________________________________________________________________
(12)  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11 EXCLUDES
      CERTAIN SHARES []
_____________________________________________________________________________
(13)  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11
       7.7 %
_____________________________________________________________________________
(14)  TYPE OF REPORTING PERSON
      IV
_____________________________________________________________________________




CUSIP No.  866810203                                     13D
_____________________________________________________________________________
(1)  NAMES OF REPORTING PERSONS
     O. Mason Hawkins                         I.D. No. XXX-XX-XXXX
_____________________________________________________________________________
(2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:
                                              (a)
                                              (b) X
_____________________________________________________________________________
(3)  SEC USE ONLY
_____________________________________________________________________________
(4)  SOURCE OF FUNDS
     00:  None
_____________________________________________________________________________
(5)  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
     REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)              [ ]
_____________________________________________________________________________
(6)  CITIZENSHIP OR PLACE OF ORGANIZATION
     Citizen of United States
_____________________________________________________________________________

                                   :(7) SOLE VOTING POWER
                                   :   (Discretionary Accounts)
NUMBER OF SHARES BENEFICIALLY      :    None
OWNED BY EACH REPORTING PERSON     __________________________________________
WITH                               :(8) SHARED VOTING POWER

                                   :    None
                                   __________________________________________
                                   :(9) SOLE DISPOSITIVE POWER

                                   :    None
                                   __________________________________________
                                   :(10) SHARED DISPOSITIVE POWER

                                   :    None
_____________________________________________________________________________
(11)  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

       None (See Item 3)
_____________________________________________________________________________
(12)  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11 EXCLUDES
      CERTAIN SHARES []
_____________________________________________________________________________
(13)  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11
      0.0 %
_____________________________________________________________________________
(14)  TYPE OF REPORTING PERSON
      IN
_____________________________________________________________________________




Item 1.  Security and Issuer

          The class of equity security to which this statement on Schedule 13D
relates is the common stock (the "Securities") of Sun Microsystems, Inc., a
Delaware corporation (the "Issuer").  The Issuer has its principal executive
offices located at 4150 Network Circle, Santa Clara, CA  95054.


Item 2.  Identity and Background

          Subparagraphs (a), (b), and (c).  This statement is being filed by
Southeastern Asset Management, Inc. ("Southeastern"), an investment advisor
registered with the Securities & Exchange Commission under the Investment
Advisers Act of 1940, as amended. The address of its principal office is 6410
Poplar Avenue, Suite 900, Memphis, Tennessee 38119.  Southeastern serves as an
investment advisor to various individual clients, institutions(including
qualified retirement plans), endowment funds and to Longleaf Partners Fund, a
series of Longleaf Partners Funds Trust, a registered investment company
organized as a Massachusetts business trust and having three series or
portfolios. Longleaf Partners Fund, which is joint filer of this Schedule 13D,
may be reached c/o Southeastern Asset Management, Inc., 6410 Poplar Avenue,
Suite 900, Memphis, Tennessee 38119.

          The Securities of the Issuer reported in Item 5 herein were acquired
on behalf of the investment advisory clients of Southeastern Asset Management,
Inc., including Longleaf Partners Fund, under sole or shared discretionary
authority granted Southeastern. None of the Securities are owned by or on
behalf of Southeastern or by any of its directors or officers, or any Trustees
or officers of Longleaf.

       This statement is also being filed by Mr. O. Mason Hawkins, Chairman of
the Board and Chief Executive Officer of Southeastern, in the event he could be
deemed to be an indirect beneficial owner of the Securities reported by
Southeastern through the exercise of voting control and/or dispositive power
over the Securities as the result of his official positions or ownership of
voting securities of Southeastern.  Neither Southeastern nor Mr. Hawkins owns
any Securities for its or his own account and each disclaims beneficial
interest in any of the Securities reported herein.

         (d) During the last five years, neither Southeastern nor Longleaf
Partners Fund, nor Mr. Hawkins has been convicted in any criminal proceeding.

         (e) During the last five years, neither Southeastern nor Longleaf
Partners Fund, nor Mr. Hawkins has been a party to any civil or administrative
proceeding involving any alleged violations of any securities laws except as
follows: in February 2004, Southeastern and Longleaf Partners Small-Cap Fund
were named in a Complaint filed by The MONY Group, Inc. (MONY) in the US
District Court for the Southern District of New York alleging that Southeastern
and the Small-Cap Fund had violated Sections 14(a) and 13(d) of the Securities
Exchange Act of 1934 with respect to their activities opposing the acquisition
of MONY by AXA Financial. MONY obtained an injunction against Southeastern and
the Small-Cap Fund enjoining distribution of a duplicate copy of MONY's proxy
card, a strategy Southeastern and the Small-Cap Fund's legal counsel had first
reviewed with the SEC's Division of Corporate Finance and received verbal
assurance that such a strategy was permitted if certain conditions were
satisfied. Even though Southeastern and the Small-Cap Fund satisfied the
conditions outlined by the SEC, in light of the injunction, neither of them
actually sent a duplicate of MONY's proxy card. At a May 18, 2004 meeting, MONY
shareholders approved the acquisition by AXA, and MONY subsequently dismissed
their lawsuit against Southeastern and the Small-Cap Fund with prejudice.

         (f) Southeastern is a corporation organized and existing under the
laws of the State of Tennessee; Longleaf Partners Funds Trust, of which
Longleaf Partners Fund is a series, is a Massachusetts business trust.  Mr.
Hawkins is a citizen of the United States.  The names, business addresses, and
principal occupations of each director and executive officer of Southeastern,
and each Trustee of Longleaf Partners Fund are set forth in Schedule I.


Item 3.  Source and Amount of Funds or Other Consideration

       The respective investment advisory clients of Southeastern used
approximately $2,115,932,199 in the aggregate to purchase the Securities
reported in this filing which include 5,000,0000 in shares underlying
Call options. All assets used to purchase Securities were assets of these
respective clients and none were assets of Southeastern. In addition, none
of the proceeds used to purchase the Securities were provided through
borrowings of any nature.


Item 4.  Purpose of Transaction

          The Securities reported in this filing have been purchased and held
for investment purposes on behalf of client accounts over which Southeastern
has either sole or shared discretionary investment or voting power.  The
Securities are reported by Southeastern and by Mr. O. Mason Hawkins, Chairman
of the Board and Chief Executive Officer in the event that either should be
deemed to be a member of a group under Section 13(d)(3) or the beneficial
owner of these Securities under the provisions of subparagraph (b)of Rule
13d-3 under the Securities Exchange Act of 1934. Beneficial ownership on the
part of Southeastern and Mr. Hawkins as members of a group or as beneficial
owners is expressly disclaimed, as permitted by Rule 13d-4.  All purchases of
Securities were made for investment purposes only, in the ordinary course of
business of Southeastern as a registered investment advisor. Southeastern may
purchase additional Securities on behalf of clients in the future, or may
sell all or a part of the current holdings of the Securities.

          Southeastern is engaged in the business of investment management of
its clients' assets and pursues an investment philosophy of identifying
undervalued situations and acquiring positions in undervalued companies on
behalf of its clients.  In pursuing this investment philosophy, Southeastern
analyzes the operations, capital structure and markets of companies in which
its clients invest and continuously monitors the business operations of such
companies through analysis of financial statements and other public documents,
through discussions with knowledgeable industry observers, and with management
of such companies, often at management's invitation.

          Southeastern qualifies as an institution which may elect to file
securities ownership reports required by the Securities Exchange Act of 1934 on
Schedule 13G and, as a routine matter, Southeastern utilizes Schedule 13G for
its reporting of the ownership positions held by its investment advisory
clients.  As the result of investment analysis or the occurrence of events,
Southeastern may desire to participate in discussions with the particular
portfolio company's management or with third parties about significant matters
in which Southeastern may suggest possible courses of action to assist in
building corporate intrinsic value per share or to cause the Company's true
economic value to be recognized.  In such situations, Southeastern may elect to
convert a filing on Schedule 13G to a filing on Schedule 13D in order to be
more active in corporate governance and management matters, and to have the
ability to enter into discussions with third parties concerning proposed
corporate transactions of a significant nature.

       In this situation, Southeastern has talked to the Issuer's management,
and will have additional conversations with management and/or third parties,
regarding opportunities to maximize the value of the company for all
shareholders. To obtain the flexibility to discuss various alternatives,
including any of the actions or transactions enumerated in clauses a through
j of Item 4 of Schedule 13D, with the Issuer's management or with third
parties, Southeastern is converting its ownership filing on Schedule 13G to
a filing on Schedule 13D.


Item 5.  Interest In Securities Of The Issuer

          (a) The aggregate number and percentage of Securities to which this
Schedule 13D relates is 160,566,828 shares of the common stock of the Issuer,
constituting approximately 21.2% of the 757,953,410 shares outstanding.  This
Amount includes 5,000,000 in shares underlying options.

                          Common       % of outstanding
                          Shares         Common Shares
                           Held
___________________________________________________________________
Voting Authority

Sole:                 84,041,928             11.1%
Shared:               58,476,000*             7.7%
None:                 18,048,900              2.4%

Total                160,566,828**           21.2%

 *Consists of shares owned by Longleaf Partners Fund, a series of Longleaf
Partners Funds Trust, an open-end management investment company registered
under the Investment Company Act of 1940.  Includes 5,000,000 in shares
underlying call options.

**Does not include 1,604,000 shares in non-discretionary accounts over
Which filing parties have neither voting nor investment discretion.

Dispositive Authority

Sole:                   102,019,178            13.5%
Shared:                  58,476,000*            7.7%
None:                        71,650             0.0%

Total                   160,566,828**          21.2%

 *Consists of shares owned by Longleaf Partners Fund, a series of Longleaf
Partners Funds Trust, an open-end management investment company registered
under the Investment Company Act of 1940.  Includes 5,000,000 in shares
underlying call options.

**Does not include 1,604,000 shares in non-discretionary accounts over
Which filing parties have neither voting nor investment discretion.

          (b) Southeastern generally has the sole power to dispose of or to
direct the disposition of the Securities held for discretionary accounts of its
investment clients, and may be granted the sole power to vote or direct the
vote of such Securities; such powers may be retained by or shared with the
respective clients for shared or non-discretionary accounts.  Shares held by
any Series of Longleaf Partners Funds Trust are reported in the "shared"
category.

          (c) Purchase or sale transactions in the Securities during the past
sixty days are disclosed on Schedule II.

          (d) The investment advisory clients of Southeastern have the sole
right to receive and, subject to notice, to withdraw the proceeds from the sale
of the Securities, and the sole power to direct the receipt of dividends from
any of the Securities held for their respective accounts.  Such clients may
also terminate the investment advisory agreements without penalty upon
appropriate notice. Southeastern does not have an economic interest in any of
the Securities reported herein.

          (e) Not applicable.


Item 6.  Contracts, Arrangements, Understandings or
         Relationships with Respect to Securities of the Issuer

          The powers of disposition with respect to Securities owned by
discretionary private accounts of Southeastern are established in written
investment advisory agreements between clients and Southeastern, which are
entered into in the normal and usual course of the business of Southeastern
as a registered investment advisor and which are generally applicable to all
securities purchased for the benefit of each such discretionary private
account.  There are no special or different agreements relating to the
Securities of the Issuer.

          The written investment advisory agreements with clients generally do
not contain provisions relating to borrowing of funds to finance the
acquisition of the Securities, acquisition of control, transfer of securities,
joint ventures, or any of the other transactions listed in the instructions to
Item 7 of Schedule 13D other than voting of proxies.  In connection with
voting, Southeastern may be allowed or directed to vote the proxies received
by accounts classified as "discretionary" or "shared" accounts; such authority
is generally retained by the clients for accounts classified as "non-
discretionary".


Item 7.  Material to be Filed as an Exhibit

Schedule I.  Information with Respect to Directors and Officers of Southeastern
Asset Management, Inc. and Longleaf Partners Fund.  Schedule II.  Transactions
in the Securities in the last 60 days.


                            Signatures

After reasonable inquiry and to the best of my knowledge and belief, I certify
that the information set forth in this statement is true, complete and correct.


Dated: October 21, 2008



                              Southeastern Asset Management, Inc.

                              By  /s/ Andrew R. McCarroll
                              _______________________________________________
                              Andrew R. McCarroll
                              Vice President and General Counsel

                              Longleaf Partners Fund
                              By: Southeastern Asset Management, Inc.

                              /s/ Andrew R. McCarroll
                              _______________________________________________
                              Andrew R. McCarroll
                              Vice President & General Counsel

                              O. Mason Hawkins, Individually

                                /s/ O. Mason Hawkins
                              _______________________________________________


                       Joint Filing Agreement

In accordance with Rule 13d-1(k) under the Securities Exchange Act
of 1934, the persons or entities named below agree to the joint
filing on behalf of each of them of this Schedule 13D with respect
to the Securities of the Issuer and further agree that this joint
filing agreement be included as an exhibit to this Schedule 13D. In
evidence thereof, the undersigned hereby execute this Agreement as
of October 21, 2008.


                              Southeastern Asset Management, Inc.

                              By  /s/ Andrew R. McCarroll
                              _______________________________________________
                              Andrew R. McCarroll
                              Vice President and General Counsel

                               Longleaf Partners Fund
                              By: Southeastern Asset Management, Inc.
                              /s/ Andrew R. McCarroll
                              _______________________________________________
                              Andrew R. McCarroll
                              Vice President & General Counsel

                              O. Mason Hawkins, Individually

                                /s/ O. Mason Hawkins
                              _______________________________________________






                                    SCHEDULE I
                      Information with Respect to Executive
                              Officers and Directors

     The following information is disclosed for each of the directors and
executive officers of Southeastern: name; business address; and present
principal occupation or employment and the name, principal business and address
of any corporation or other organization in which such employment is
conducted.  Unless otherwise specified, the principal employer of each such
individual is Southeastern Asset Management, Inc., having its principal
executive offices located at 6410 Poplar Ave., Suite 900, Memphis, Tennessee
38119.  Each individual identified below is a citizen of the United States.

    To the knowledge of management of Southeastern, during the last five years,
no such person has been convicted in a criminal proceeding (excluding traffic
violations or similar misdemeanors), and no such person was a party to a civil
proceeding of a judicial or administrative body of competent jurisdiction as a
result of which he was or is subject to a judgment, decree or final order
enjoining future violations of, or prohibiting or mandating activities subject
to, federal or state securities law or finding any violation with respect to
such laws.

                SOUTHEASTERN ASSET MANAGEMENT, INC.
Directors

O. Mason Hawkins: Chairman of the Board and Chief Executive Officer of
Southeastern Asset Management, Inc.; Trustee and Co-Portfolio Manager of
Longleaf Partners Funds.

G. Staley Cates:  Director and President of Southeastern Asset Management,
Inc.; Co-Portfolio Manager Longleaf Partners Funds.

Richard W. Hussey: Director and Chief Operating Officer of Southeastern Asset
Management, Inc.

Other Officers

 James H. Barton        Vice President
 Scott Cobb             Analyst
 Deborah Craddock    	Vice President
 Julie M. Douglas       Vice President
 Jason Dunn             Vice President
 Jeff Engelberg		Senior Trader
 Ross Glotzbach		Analyst
 Lee B. Harper          Vice President
 Lowery Howell		Analyst
 Steve McBride		Legal Counsel
 Andrew R. McCarroll    Vice President
 E. Andrew McDermott    Vice President
 Joseph L. Ott          Operations Director
 Josh Shores		Analyst
 Ken Siazon             Analyst
 Frank Stanley		Vice President
 Jamie Bacchus		Director of Client Accounting
 Gary Wilson		Vice President
 Mike Wittke		Legal Counsel and CCO


                         LONGLEAF PARTNERS FUND

       The following information is disclosed for each of the directors and
executive officers of Longleaf Partners Fund: name; address; and present
principal occupation or employment and the name, principal business and address
of any corporation or other organization in which such employment is conducted.
Each individual identified below is a citizen of the United States. The address
of each individual for purposes of correspondence is c/o Southeastern Asset
Management, Inc., 6410 Poplar Avenue, Suite 900, Memphis, Tennessee 38119.

    To the knowledge of management of Longleaf Partners Fund during the last
five years, no such person has been convicted in a criminal proceeding
(excluding traffic violations or similar misdemeanors), and no such person was
a party to a civil proceeding of a judicial or administrative body of
competent jurisdiction as a result of which he was or is subject to a
judgment, decree or final order enjoining future violations of, or prohibiting
or mandating activities subject to, federal or state securities law or finding
any violation with respect to such laws except as follows: in February 2004,
Southeastern and Longleaf Partners Small-Cap Fund were named in a Complaint
filed by The MONY Group, Inc. (MONY) in the US District Court for the Southern
District of New York alleging that Southeastern and the Small-Cap Fund had
violated Sections 14(a) and 13(d) of the Securities Exchange Act of 1934 with
respect to their activities opposing the acquisition of MONY by AXA Financial.
MONY obtained an injunction against Southeastern and the Small-Cap Fund
enjoining distribution of a duplicate copy of MONY's proxy card, a strategy
Southeastern and the Small-Cap Fund's legal counsel had first reviewed with
the SEC's Division of Corporate Finance and received verbal assurance that
such a strategy was permitted if certain conditions were satisfied. Even
though Southeastern and the Small-Cap Fund satisfied the conditions outlined
by the SEC, in light of the injunction, neither of them actually sent a
duplicate of MONY's proxy card. At a May 18, 2004 meeting, MONY shareholders
approved the acquisition by AXA, and MONY subsequently dismissed their lawsuit
against Southeastern and the Small-Cap Fund with prejudice.


Trustees

O. Mason Hawkins: Chairman of the Board and Chief Executive Officer of
Southeastern Asset Management, Inc.; Trustee and Co-Portfolio Manager of
Longleaf Partners Funds.

Chadwick H. Carpenter, Jr.: Trustee of Longleaf Partners Funds; private
investor and consultant.

Margaret H. Child: Trustee of Longleaf Partners Funds; marketing consultant.

Daniel W. Connell, Jr.: Trustee of Longleaf Partners Funds; private investor
and consultant.

Rex M. Deloach: Trustee of Longleaf Partners Funds; President, Financial
Insights, Inc.

Steven N. Melnyk: Trustee of Longleaf Partners Funds; Real Estate Development,
The Sea Island Company.

C. Barham Ray: Trustee of Longleaf Partners Funds; Partner, SSM Corporation.

Perry Steger:  Chairman of the Board, Longleaf Partners Funds; President,
Steger & Bizzell Engineering, Inc.






















































                                          Schedule II
                     Transactions in the Last Sixty Days

Transaction Type     Date              # of Shares      Price per Share *

Purchase                  08/22/08       295,430                    $ 10.01
Purchase                  08/22/08       323,570                    $ 10.00
Purchase                  08/26/08        27,000                    $  9.53
Purchase                  08/28/08        57,000                    $  9.01
Purchase                  08/28/08      204 ,375                    $  9.01
Purchase                  08/28/08        73,625                    $  8.97
Purchase                  08/28/08    2,444 ,855                    $  9.01
Purchase                  08/28/08        38,500                    $  8.97
Purchase                  08/28/08       135,750                    $  8.97
Purchase                  08/28/08        16,000                    $  9.01
Purchase                  08/28/08        29,000                    $  9.01
Purchase                  08/28/08        48,850                    $  9.01
Purchase                  08/28/08         8,425                    $  8.97
Purchase                  08/28/08        42,000                    $  9.01
Purchase                  08/28/08       135,295                    $  9.01
Purchase                  08/28/08        53,705                    $  9.01
Purchase                  08/29/08         6,000                    $  9.01
Purchase                  08/29/08        82,000                    $  9.01
Purchase                  08/29/08        78,322                    $  8.95
Purchase                  08/29/08        59,000                    $  9.01
Purchase                  08/29/08        33,543                    $  8.95
Purchase                  08/29/08        58,457                    $  9.01
Purchase                  09/02/08       172,000                    $  9.12
Purchase                  09/02/08       128,000                    $  9.12
Purchase                  09/02/08        26,000                    $  9.12
Purchase                  09/02/08        12,000                    $  9.12
Purchase                  09/02/08        23,000                    $  9.12
Purchase                  09/02/08        46,000                    $  9.12
Purchase                  09/02/08        21,800                    $  9.18
Purchase                  09/02/08        47,878                    $  9.12
Purchase                  09/02/08        41,000                    $  9.12
Purchase                  09/02/08        67,000                    $  9.12
Purchase                  09/02/08        66,000                    $  9.12
Purchase                  09/02/08         7,000                    $  9.12
Purchase                  09/02/08        12,000                    $  9.12
Purchase                  09/02/08        26,000                    $  9.12
Purchase                  09/02/08        12,000                    $  9.12
Purchase                  09/02/08       386,000                    $  9.12
Purchase                  09/03/08        16,000                    $  8.95
Purchase                  09/04/08       214,000                    $  8.70
Purchase                  09/04/08        24,000                    $  8.70
Purchase                  09/04/08       148,000                    $  8.70
Purchase                  09/04/08        88,000                    $  8.70
Purchase                  09/08/08        23,000                    $  8.58
Purchase                  09/08/08         8,000                    $  8.58
Purchase                  09/09/08        18,000                    $  8.87
Purchase                  09/09/08        74,000                    $  9.11
Purchase                  09/09/08       125,000                    $  8.87
Purchase                  09/09/08        22,000                    $  8.87
Purchase                  09/09/08        35,000                    $  9.11
Purchase                  09/09/08        34,000                    $  9.11
Purchase                  09/09/08        55,000                    $  8.87
Purchase                  09/09/08        97,000                    $  8.87
Purchase                  09/09/08       258,000                    $  8.87
Purchase                  09/09/08        17,000                    $  8.87
Purchase                  09/09/08        57,000                    $  8.87
Purchase                  09/09/08        27,000                    $  8.87
Purchase                  09/09/08        27,000                    $  8.87
Purchase                  09/09/08        68,000                    $  8.87
Purchase                  09/09/08        77,000                    $  8.87
Purchase                  09/10/08       153,696                    $  9.02
Purchase                  09/10/08       121,304                    $  8.70
Purchase                  09/10/08         2,300                    $  8.70
Purchase                  09/11/08        62,000                    $  8.89
Purchase                  09/11/08        29,000                    $  8.88
Purchase                  09/11/08        31,000                    $  8.88
Purchase                  09/11/08        45,000                    $  8.88
Purchase                  09/11/08        30,000                    $  8.88
Purchase                  09/11/08        61,900                    $  8.88
Purchase                  09/11/08       664,100                    $  8.88
Purchase                  09/12/08         7,000                    $  9.32
Purchase                  09/12/08         3,000                    $  9.41
Purchase                  09/12/08        18,000                    $  9.32
Purchase                  09/12/08        14,000                    $  9.41
Purchase                  09/12/08        24,000                    $  9.32
Purchase                  09/12/08        12,000                    $  9.41
Purchase                  09/12/08        12,000                    $  9.06
Purchase                  09/12/08        28,000                    $  9.32
Purchase                  09/12/08        14,000                    $  9.41
Purchase                  09/12/08        39,000                    $  9.32
Purchase                  09/12/08        13,000                    $  9.41
Purchase                  09/12/08       138,000                    $  9.32
Purchase                  09/12/08        69,000                    $  9.41
Purchase                  09/12/08        14,000                    $  9.06
Purchase                  09/12/08       146,000                    $  9.32
Purchase                  09/12/08        83,100                    $  9.40
Purchase                  09/12/08        62,403                    $  9.06
Purchase                  09/15/08        18,000                    $  9.10
Purchase                  09/15/08         3,000                    $  9.10
Purchase                  09/15/08        64,000                    $  9.10
Purchase                  09/15/08       234,000                    $  9.10
Purchase                  09/15/08       105,000                    $  9.10
Purchase                  09/15/08        10,000                    $  9.10
Purchase                  09/15/08        10,000                    $  9.10
Purchase                  09/15/08       107,000                    $  9.10
Purchase                  09/15/08         6,000                    $  9.10
Purchase                  09/15/08        48,000                    $  9.10
Purchase                  09/15/08       263,000                    $  9.10
Purchase                  09/15/08         6,000                    $  9.01
Purchase                  09/15/08        21,000                    $  9.10
Purchase                  09/15/08        11,000                    $  9.10
Purchase                  09/15/08        22,000                    $  9.10
Purchase                  09/15/08        98,000                    $  9.10
Purchase                  09/15/08       175,000                    $  9.10
Purchase                  09/15/08         1,000                    $  9.01
Purchase                  09/15/08        10,000                    $  9.01
Purchase                  09/15/08        21,000                    $  9.10
Purchase                  09/15/08       141,000                    $  9.15
Purchase                  09/15/08        39,000                    $  9.10
Purchase                  09/15/08       100,000                    $  9.01
Purchase                  09/15/08       115,000                    $  9.10
Purchase                  09/15/08        44,000                    $  9.10
Purchase                  09/15/08        15,000                    $  9.01
Purchase                  09/15/08        41,497                    $  9.10
Purchase                  09/15/08        38,000                    $  9.01
Purchase                  09/15/08        45,000                    $  9.10
Purchase                  09/15/08        15,000                    $  9.10
Purchase                  09/15/08       151,000                    $  9.10
Purchase                  09/16/08       105,000                    $  8.37
Purchase                  09/17/08        58,000                    $  7.90
Purchase                  09/18/08       127,000                    $  7.85
Purchase                  09/18/08        61,000                    $  8.02
Purchase                  09/18/08       561,000                    $  7.85
Purchase                  09/18/08       272,000                    $  8.02
Purchase                  09/19/08        31,000                    $  8.01
Purchase                  09/19/08        17,000                    $  8.37
Purchase                  09/19/08        78,000                    $  8.37
Purchase                  09/19/08        10,000                    $  8.37
Purchase                  09/19/08        33,000                    $  8.37
Purchase                  09/19/08        63,000                    $  8.37
Purchase                  09/19/08         7,000                    $  8.01
Purchase                  09/19/08        18,000                    $  8.37
Purchase                  09/19/08        38,000                    $  8.37
Purchase                  09/22/08        39,000                    $  8.32
Purchase                  09/22/08        20,000                    $  8.32
Purchase                  09/24/08        28,000                    $  8.00
Purchase                  09/24/08        29,434                    $  7.85
Purchase                  09/24/08        49,566                    $  7.99
Purchase                  09/24/08        47,000                    $  7.94
Purchase                  09/24/08        12,634                    $  8.00
Purchase                  09/24/08       330,366                    $  7.94
Purchase                  09/24/08       141,000                    $  7.85
Purchase                  09/24/08        55,000                    $  7.94
Purchase                  09/25/08        93,000                    $  7.98
Purchase                  09/25/08         7,000                    $  7.98
Purchase                  09/25/08        12,000                    $  7.94
Purchase                  09/25/08        33,000                    $  7.94
Purchase                  09/25/08       766,000                    $  7.94
Purchase                  09/25/08        61,000                    $  7.94
Purchase                  09/25/08        76,000                    $  7.94
Purchase                  09/25/08       172,000                    $  7.94
Purchase                  09/25/08        17,000                    $  7.94
Purchase                  09/25/08       123,000                    $  7.94
Purchase                  09/25/08         5,000                    $  8.04
Purchase                  09/25/08         3,000                    $  7.94
Purchase                  09/25/08         2,000                    $  7.94
Purchase                  09/25/08        40,000                    $  7.94
Purchase                  09/25/08         5,000                    $  7.94
Purchase                  09/25/08         4,000                    $  7.94
Purchase                  09/25/08        50,000                    $  7.94
Purchase                  09/25/08       254,000                    $  7.94
Purchase                  09/25/08        38,000                    $  7.94
Purchase                  09/25/08        36,000                    $  8.03
Purchase                  09/25/08           200                    $  7.94
Purchase                  09/25/08         7,800                    $  7.94
Purchase                  09/25/08       229,000                    $  7.94
Purchase                  09/25/08        24,000                    $  7.94
Purchase                  09/25/08        12,000                    $  7.94
Purchase                  09/30/08     1,000,000                    $  7.02
Purchase                  09/30/08     1,803,000                    $  7.05
Purchase                  09/30/08       900,000                    $  6.88
Sale                      10/03/08        98,221                    $  7.02
Sale                      10/03/08       114,079                    $  7.02
Sale                      10/03/08         6,400                    $  7.09
Sale                      10/03/08        16,521                    $  7.13
Sale                      10/03/08        14,779                    $  7.13
Purchase                  10/06/08        22,000                    $  6.57
Purchase                  10/13/08        28,000                    $  5.11
Purchase                  10/14/08         9,000                    $  5.90
Purchase                  10/14/08       775,000                    $  5.90
Purchase                  10/14/08        33,000                    $  5.90
Purchase                  10/14/08         8,000                    $  5.90
Purchase                  10/16/08       136,000                    $  4.97
Purchase                  10/16/08        68,000                    $  4.97
Purchase                  10/17/08        41,000                    $  5.63
Purchase                  10/17/08        40,000                    $  5.63
Purchase                  10/17/08        65,000                    $  5.63
Purchase                  10/17/08       272,000                    $  5.63
Purchase                  10/17/08        47,000                    $  5.63
Purchase                  10/17/08       119,000                    $  5.63
Purchase                  10/17/08       142,000                    $  5.63
Purchase                  10/17/08       213,797                    $  5.63
Purchase                  10/20/08       151,203                    $  5.67




Purchases and sales by Southeastern private account clients in the ordinary
course of business on the NASDAQ Stock Exchange or through Electronic
Communication Networks (ECNs).  In addition to the above
transactions, on August 27, 2008 and September 9, 2008, new clients of
Southeastern added 600,000 and 5,700 shares  to Southeastern's discretion and on
 August 29, 2008, September 24, 2008 and September 25, 2008, clients of
Southeastern terminating their advisory  relationship removed 138,625,  278,000
and 22,000 shares from Southeastern's discretion.


* Net of commissions




1
JAVA13D.doc
SCHEDULE 13D - Sun Microsystems, Inc. ("Issuer")

2
JAVA13Ddoc