UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 8-K

CURRENT REPORT
Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported) ~~May~~November 1, ~~2006~~2007

MS Structured Asset Corp. (Issuer in Respect of SATURNS Trust No. 2003-4)
(Exact name of registrant as specified in its charter)

Delaware
(State or other jurisdiction
of incorporation)

001-16443
(Commission
File Number)

13-4026700
(IRS Employer
Identification No.)

1585 Broadway, New York, New York
(Address of principal executive offices)

10036
(Zip Code)

Registrant's telephone number, including area code 212-761-2520

(Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

[ ] Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

[ ] Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

[ ] Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

[ ] Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Section 8 - Other Events

Item 8.01. Other Events.

This current report on Form 8-K relates to the semi annual distribution reported to the holders of SATURNS Trust No. 2003-4, which was made on ~~May~~November 1, ~~2006~~2007.

Section 9 - Financial Statements and Exhibits

Item 9.01 Financial Statements and Exhibits.

(Exhibit No. Description) 99.1 Semi-Annual distribution report pursuant to the Trust Agreement for the distribution on ~~May~~November 1, ~~2006~~2007.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

LASALLE BANK NATIONAL ASSOCIATION, IN ITS CAPACITY AS TRUSTEE UNDER THE TRUST AGREEMENT ON BEHALF OF MS STRUCTURED ASSET CORP., REGISTRANT

By: /s/ ~~Russell~~Barbara ~~Goldenberg~~L. ~~Russell~~Marik ~~Goldenberg~~Barbara ~~Group~~L. Marik Senior Vice President Date: ~~May~~November 46, ~~2006~~2007

Structured Asset Trust Unit Repackagings (SATURNS) Dow Chemical Company Debenture Backed Series 2003-4 ABN AMRO Acct: 720491.1 Reporting Package Table of Contents Payment Date:Prior Payment:Next Payment:Record Date: 01-~~May~~Nov-~~0601~~0701-~~May~~Nov-0607 01-~~Nov~~May-~~0501~~0701-~~Nov~~May-0608 2629-~~Apr~~Oct-0607 Administrator:~~Andy~~ ~~Streepey~~Scott Kallback 312.904.~~9387andy~~5444scott.~~streepey~~kallback@abnamro.com Analyst:~~Tom~~ ~~John~~Linda Wang 714.259.~~6275~~6223 ~~tom~~linda.~~john~~wang@abnamro.com Statement Date: 135 S. LaSalle Street, Suite 1625Chicago, IL 60603USA Statements to CertificateholdersCash Reconciliation SummaryBond Interest ReconciliationOther Related Information Other Related Information Rating InformationRealized Loss Detail Other Related Information Page 2Page 3Page 4Page 5 Page 6 Page 7Page 8 Page 9 Page(s) Information is available for this issue from the following sources Issue Id: Monthly Data ~~FileName~~File Name: SAT00304 ~~SAT00304_200605_3~~SAT00304_200711_3.ZIP Closing Date: First Payment Date: Rated Final Payment: Date: 20-Mar-031-May-03 1-Nov-29 Parties to The Transaction Depositor: MS Structured Asset Corp Underwriter: Morgan Stanley & Co. Incorporated Rating Agency: Moody's Investors Service, Inc./Standard & Poor's 800.246.5761 LaSalle Factor Line LaSalle Web Site www.etrustee.net Page 1 of 89 2630-~~Apr~~Oct-~~2006~~2007 - 1109:0322 (K790-K791) (c) ~~2006~~2007 LaSalle Bank N.A. Class CUSIP Original Opening Principal Principal Negative Closing Interest Interest Pass-Through Per $ 1000 Per $ 1000 Per $ 1000 Per $ 1000 Per $ 1000 Per $ 1000 Per $ 1000 Next Rate(3) WAC:WAMM: Payment Date:Prior Payment:Next Payment:Record Date: 43.949400% 01-~~May~~Nov-~~0601~~0701-~~May~~Nov-0607 01-~~Nov~~May-~~0501~~0701-~~Nov~~May-0608 2629-~~Apr~~Oct-0607 Structured Asset Trust Unit Repackagings (SATURNS) Dow Chemical Company Debenture Backed Series 2003-4 Face Value (1) Balance Payment Adj. or Loss Amortization Balance Payment (2) Adjustment Rate ~~564~~528 Grantor Trust Statement Date: ABN AMRO Acct: 720491.1 1000.000000000 0.000000000 0.000000000 1000.000000000 31.875000192 Fixed 0.00 0.00 0.000000000 6.3750000000% 0.000000000 80411C207 A UNIT 25,975,000.00 0.00 0.00 25,975,000.00 827,953.13 25,975,000.00 1000.000000000 0.000000000 0.000000000 1000.000000000 4.749499904 Fixed 0.00 0.00 0.000000000 0.9499000000% 0.000000000 N 80411CAA6 B UNIT 25,975,000.00 0.00 0.00 25,975,000.00 123,368.26 25,975,000.00 Total P&I Payment 0.00 0.00 25,975,000.00 25,975,000.00 951,321.39 Total 25,975,000.00 0.00 0.00 951,321.39 2630-~~Apr~~Oct-~~2006~~2007 - 1109:0322 (K790-K791) (c) ~~2006~~2007 LaSalle Bank N.A. Page 2 of 89 Notes: (1) N denotes notional balance not included in total (2) Accrued Interest Plus/Minus Interest Adjustment Minus Deferred Interest equals Interest Payment (3) Estimated. * Denotes Controlling Class Structured Asset Trust Unit Repackagings (SATURNS) Payment Date:Prior Payment:Next Payment:Record Date: 01-~~May~~Nov-~~0601~~0701-~~May~~Nov-0607 01-~~Nov~~May-~~0501~~0701-~~Nov~~May-0608 2629-~~Apr~~Oct-0607 Dow Chemical Company Debenture Backed Series 2003-4 ABN AMRO Acct: 720491.1 Statement Date: Cash Reconciliation Summary Current Scheduled Interest Interest Summary Less Deferred Interest Plus Gross Advance Interest Less PPIS Reducing Scheduled Int 951,321.39 0.000.00 Less ASER Interest Adv Reduction 0.00 Less Other Adjustment 0.00 Total 951,321.39 Unscheduled Interest:Prepayment Penalties 0.00 Yield Maintenance Penalties 0.00 Other Interest Proceeds 0.00 Total 0.00 Less Fees & Expenses Paid By/To Servicer Less Fee Paid To Servicer Less Fee Strips Paid by Servicer Special Servicing Fees Interest Due Serv on AdvancesRecoup of Prior AdvancesMisc. Fees & Expenses Total Unscheduled Fees & Expenses Total Interest Due Trust Less Fees & Expenses Paid By/To TrustTrustee FeeFee Strips Interest Reserve ~~Withholding~~WithholdingPlus ~~Plus~~ Interest Reserve DepositTotal Total Interest Due Certs Principal Summary Scheduled Principal:Current Scheduled PrincipalAdvanced Scheduled PrincipalScheduled PrincipalUnscheduled Principal:CurtailmentsPrepayments in FullLiquidation ProceedsRepurchase ProceedsOther Principal ProceedsTotal Unscheduled Principal Remittance Principal Remittance P&I Due Trust Remittance P&I Due Certs Pool Balance Summary Beginning PoolScheduled PrincipalUnscheduled PrincipalDeferred InterestLiquidationsRepurchases Ending Pool Balance Count Principal Interest Prior ~~OutstandingPlus~~Outstanding Plus Current ~~PeriodLess~~Period Less Recovered Ending Outstanding Servicing Fee Summary Current Servicing FeesPlus Fees Advanced for PPISLess Reduction for PPISPlus Delinquent Servicing Fees Total Servicing Fees PPIS Summary Gross PPISReduced by PPIEReduced by Shortfalls in FeesReduced by Other ~~Amounts~~AmountsPPIS ~~PPIS~~ Reducing ~~ScheduledInterest~~Scheduled ~~PPIS~~InterestPPIS Reducing Servicing ~~FeePPIS~~Fee PPIS Due Certificate 0.00 0.00 0.000.00 0.00 0.00 951,321.39 0.000.000.000.00 0.00 0.000.000.00 0.000.000.000.000.000.000.00 951,321.39 951,321.39 25,975,000.00 2 0.000.00 0 0.000.00 0 0.00 0 25,975,000.00 2 0.00 0.00 0.00 0.00 0.00 0.00 0.000.000.000.00 0.00 0.000.000.000.000.000.00 0.00 0.00 951,321.39 Interest Not Advanced ( Current Period ) 0.00 0.00 Workout FeesLiquidation Fees 0.000.00 Less Non Recovered 0.00 0.000.00 0.00 0.00 Advance Summary (Advance Made by Servicer) 0 0.00 Misc. Fees Page 3 of 89 2630-~~Apr~~Oct-~~2006~~2007 - 1109:0322 (K790-K791) (c) ~~2006~~2007 LaSalle Bank N.A. Structured Asset Trust Unit Repackagings (SATURNS) Class Accrued Payment Date: Prior Payment:Next Payment:Record Date: 01-~~May~~Nov-~~0601~~0701-~~May~~Nov-0607 01-~~Nov~~May-~~0501~~0701-~~Nov~~May-0608 2629-~~Apr~~Oct-0607 Dow Chemical Company Debenture Backed Series 2003-4 ABN AMRO Acct: 720491.11Bond ~~Bond~~ Interest Reconciliation Deductions Allocable Deferred & Prior Prepay- Other Additions Interest Credit Support Original Current(4) Accrual Int. Short- falls Due ment Interest ~~Int~~Interest ~~erest~~ (2) Payment Amount PPIS ~~Int~~Interest ~~erest~~ Certificate Accretion Interest Loss/Exp Interest Penalties Proceeds (1) Interest Shortfalls Certificate Rate Pass Thru Method Days Outstanding Remaining Statement Date: Distributable Current Period (Shortfall)/ Recovery Int Accrual on Prior Shortfall (3) 1.001.00 0.00 0.00 0.00 0.00 0.00 A UNIT ~~180~~ 827,953.13 827,953.13 827,953.13 0.00 NA NA ~~30/360~~ 6.375000000% 0.00 0.00 0.00 30/360 180 0.00 0.00 0.00 0.00 0.00 B UNIT ~~180~~ 123,368.26 123,368.26 123,368.26 0.00 NA NA ~~30/360~~ 0.949900000% 0.00 0.00 0.00 30/360 180 0.00 0.00 0.00 0.00 0.00 951,321.39 951,321.39 951,321.39 0.00 0.00 0.00 0.00 (2) Accrued - Deductions + Additions Interest (3) Includes interest accrued on outstanding Interest Shortfalls and/or Loss Allocations. Where applicable. 2630-~~Apr~~Oct-~~2006~~2007 - 1109:0322 (K790-K791) (c) ~~2006~~2007 LaSalle Bank N.A. Page 4 of 89 (1) Other Interest Proceeds are additional interest amounts specifically allocated to the bond(s) and used in determining the bonds Distributable Interest. (4) Determined as follows: (A) the ending balance of all the classes less (B) the sum of (i) the ending balance of the class and (ii) the ending balance of all classes which are not subordinate to the class divided by (A). Structured Asset Trust Unit Repackagings (SATURNS) Payment Date:Prior Payment:Next Payment:Record Date: 01-~~May~~Nov-~~0601~~0701-~~May~~Nov-0607 01-~~Nov~~May-~~0501~~0701-~~Nov~~May-0608 2629-~~Apr~~Oct-0607 Dow Chemical Company Debenture Backed Series 2003-4 ABN AMRO Acct: 720491.1 Other Related Information Statement Date: Swap Receipents Swap Amount Received Next Swap Rate None 0.00 0.00% Swap Information Page 5 of 89 2630-~~Apr~~Oct-~~2006~~2007 - 1109:0322 (K790-K791) (c) ~~2006~~2007 LaSalle Bank N.A. Structured Asset Trust Unit Repackagings (SATURNS) Payment Date:Prior Payment:Next Payment:Record Date: 01-~~May~~Nov-~~0601~~0701-~~May~~Nov-0607 01-~~Nov~~May-~~0501~~0701-~~Nov~~May-0608 2629-~~Apr~~Oct-0607 Dow Chemical Company Debenture Backed Series 2003-4 ABN AMRO Acct: 720491.1 Other Related Information Statement Date: The underlying security issuer or guarantor, as applicable, is subject to the informational requirements of the Exchange Act. ~~Theunderlying~~The underlying security issuer or guarantor, as applicable, currently files reports, proxy statements and other information with the SEC. Those periodic reports, current reports and other reports and other information can be inspected and copied at the public ~~referencefacilities~~reference facilities maintained by the SEC at Room 1024, 450 Fifth Street, N.W., Washington, D.C. 20549, at prescribed rates. The SEC ~~alsomaintains~~also maintains a website on the internet at http://www.sec.gov at which users can view and download copies of reports, proxy, ~~informationstatements~~information statements and other information filed electronically. In addition, those reports and other information may also be obtained from ~~theunderlying~~the underlying security issuer by making a request to the underlying security issuer. Page 6 of 89 2630-~~Apr~~Oct-~~2006~~2007 - 1109:0322 (K790-K791) (c) ~~2006~~2007 LaSalle Bank N.A. Structured Asset Trust Unit Repackagings (SATURNS) Payment Date: Prior Payment: Next Payment: Record Date: 01-~~May~~Nov-~~0601~~0701-~~May~~Nov-0607 01-~~Nov~~May-~~0501~~0701-~~Nov~~May-0608 2629-~~Apr~~Oct-0607 Dow Chemical Company Debenture Backed Series 2003-4 ABN AMRO Acct: 720491.1 Rating Information Class CUSIP Fitch Moody's S&P Fitch Moody's S&P Original Ratings Rating Change/Change Date(1) Statement Date: A UNIT 80411C207 NR A3 A- B UNIT 80411CAA6 NR NR NR Page 7 of 89 2630-~~Apr~~Oct-~~2006~~2007 - 1109:0322 (K790-K791) (c) ~~2006~~2007 LaSalle Bank N.A. NR - Designates that the class was not rated by the rating agency. (1) Changed ratings provided on this report are based on information provided by the applicable rating agency via electronic transmission. It shall be understood that this transmission will generally have been provided to LaSalle within 30 days of the payment date listed on this statement. Because ratings may have changed during the 30 day window, or may not be being provided by the rating agency in an electronic format and therefore ~~notbeing~~not being updated on this report, LaSalle recommends that investors obtain current rating information directly from the rating agency. Structured Asset Trust Unit Repackagings (SATURNS) Payment Date:Prior Payment:Next Payment:Record Date: 01-~~May~~Nov-~~0601~~0701-~~May~~Nov-0607 01-~~Nov~~May-~~0501~~0701-~~Nov~~May-0608 2629-~~Apr~~Oct-0607 Dow Chemical Company Debenture Backed Series 2003-4 ABN AMRO Acct: 720491.1 Realized Loss Detail Period Disclosure Control # Appraisal Date Appraisal Value Beginning Scheduled Balance Gross Proceeds Gross Proceeds as a % of Sched. Balance Aggregate ~~Liquidation~~LiquidationExpenses ~~Expenses~~ * Net Liquidation Proceeds Net Proceeds as a % of Sched. Balance Realized Loss Statement Date: Current Total Cumulative 2630-~~Apr~~Oct-~~2006~~2007 - 1109:0322 (K790-K791) (c) ~~2006~~2007 LaSalle Bank N.A. Page 8 of 89 * Aggregate liquidation expenses also include outstanding P&I advances and unpaid servicing fees, unpaid trustee fees, etc.. Structured Asset Trust Unit Repackagings (SATURNS) Payment Date:Prior Payment:Next Payment:Record Date: 01-Nov-0701-Nov-07 01-May-0701-May-08 29-Oct-07 Dow Chemical Company Debenture Backed Series 2003-4 Notice to Investors Statement Date: Effective October 1, 2007, Bank of America Corporation, parent corporation of Bank of America, N.A. ("Bank of America") and Banc of America Securities LLC ("BAS"), has acquired ABN AMRO North America Holding Company, parent company of LaSalle Bank Corporation and LaSalle Bank National Association ("LaSalle"), from ABN AMRO Bank N.V. (the "Acquisition"). 30-Oct-2007 - 09:22 (K790-K791) (c) 2007 LaSalle Bank N.A. Page 9 of 9

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