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Exhibit 99.11a EXECUTION COPY ASSIGNMENT, ASSUMPTION AND RECOGNITION AGREEMENT

Assignment and Assumption Agreement

Exhibit 99.11a EXECUTION COPY ASSIGNMENT, ASSUMPTION AND RECOGNITION AGREEMENT | Document Parties: LASALLE BANK | MORGAN STANLEY CAPITAL I INC | MORGAN STANLEY MORTGAGE CAPITAL INC | Regulation AB | Wachovia Mortgage Corporation | Wells Fargo Bank, National Association You are currently viewing:
This Assignment and Assumption Agreement involves

LASALLE BANK | MORGAN STANLEY CAPITAL I INC | MORGAN STANLEY MORTGAGE CAPITAL INC | Regulation AB | Wachovia Mortgage Corporation | Wells Fargo Bank, National Association

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Title: Exhibit 99.11a EXECUTION COPY ASSIGNMENT, ASSUMPTION AND RECOGNITION AGREEMENT
Governing Law: New York     Date: 2/16/2007

Exhibit 99.11a EXECUTION COPY ASSIGNMENT, ASSUMPTION AND RECOGNITION AGREEMENT, Parties: lasalle bank , morgan stanley capital i inc , morgan stanley mortgage capital inc , regulation ab , wachovia mortgage corporation , wells fargo bank  national association
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                                                                Exhibit 99.11a

                                                                EXECUTION COPY

               ASSIGNMENT, ASSUMPTION AND RECOGNITION AGREEMENT

      THIS ASSIGNMENT, ASSUMPTION AND RECOGNITION AGREEMENT (this
"Assignment"), dated as of January 1, 2007, is entered into among Morgan
Stanley Capital I Inc., a Delaware corporation (the "Depositor"), Morgan
Stanley Mortgage Capital Inc. ("MSMCI"), Wachovia Mortgage Corporation as
seller ("Wachovia" and, in such capacity, the "Seller") and servicer (in such
capacity, the "Servicer"), and acknowledged by LaSalle Bank National
Association, as trustee (the "Trustee") of Morgan Stanley Mortgage Loan Trust
2007-1XS (the "Trust"), and Wells Fargo Bank, National Association, as master
servicer (or any successor master servicer, the "Master Servicer").

                                   RECITALS

      WHEREAS MSMCI, the Seller and the Servicer have entered into a certain
Seller's Purchase, Warranties and Servicing Agreement, dated as of September
1, 2004 (the "Initial Agreement"), as supplemented by the Amended and Restated
Regulation AB Compliance Addendum (the "Reg AB Addendum"), dated as of April
17, 2006, (as further amended or modified to the date hereof, the
"Agreement"), pursuant to which MSMCI has acquired certain Mortgage Loans
pursuant to the terms of the Agreement and the Servicer has agreed to service
such Mortgage Loans;

      WHEREAS the Depositor has agreed, on the terms and conditions contained
herein, to purchase from MSMCI certain of the Mortgage Loans (the "Specified
Mortgage Loans") which are subject to the provisions of the Agreement and are
listed on the mortgage loan schedule attached as Exhibit I hereto (the
"Specified Mortgage Loan Schedule"); and

      WHEREAS the Trustee, on behalf of the Trust, has agreed, on the terms
and conditions contained herein, to purchase from the Depositor the Specified
Mortgage Loans;

      NOW, THEREFORE, in consideration of the mutual promises contained herein
and other good and valuable consideration (the receipt and sufficiency of
which are hereby acknowledged), the parties agree as follows:

1.     Assignment and Assumption

      (a) On and as of the date hereof, MSMCI hereby sells, assigns and
transfers to the Depositor all of its right, title and interest in the
Specified Mortgage Loans and all rights and obligations related thereto as
provided under the Agreement to the extent relating to the Specified Mortgage
Loans, the Depositor hereby accepts such assignment from MSMCI (the "First
Assignment and Assumption"), and the Seller hereby acknowledges the First
Assignment and Assumption.

          MSMCI specifically reserves and does not assign to the Depositor
hereunder any and all right, title and interest in, to and under and all
obligations of MSMCI with respect to any Mortgage Loans subject to the
Agreement which are not the Specified Mortgage Loans.

      (b) On and as of the date hereof, immediately after giving effect to the
First Assignment and Assumption, the Depositor hereby sells, assigns and
transfers to the Trustee, on behalf of the Trust, all of its right, title and
interest in the Specified Mortgage Loans and all rights and obligations
related thereto as provided under the Agreement to the extent relating to the
Specified Mortgage Loans, and the Trustee, on behalf of the Trust, hereby
accepts such assignment from the Depositor (the "Second Assignment and
Assumption"), and the Seller hereby acknowledges the Second Assignment and
Assumption.

      (c) On and as of the date hereof, MSMCI represents and warrants to the
Depositor and the Trustee that MSMCI has not taken any action that would serve
to impair or encumber the respective ownership interests of the Depositor and
the Trustee in the Specified Mortgage Loans since the date of MSMCI's
acquisition of the Specified Mortgage Loans.

2. Recognition of Trustee

      (a) From and after the date hereof, both MSMCI and the Seller shall note
the transfer of the Specified Mortgage Loans to the Trustee, in their
respective books and records and shall recognize the Trustee, on behalf of the
Trust, as of the date hereof, as the owner of the Specified Mortgage Loans,
and Servicer shall service the Specified Mortgage Loans for the benefit of the
Trust pursuant to the Agreement, as modified hereby, the terms of which are
incorporated herein by reference. It is the intention of the Seller, the
Servicer, the Depositor, the Trustee and MSMCI that this Assignment shall be
binding upon and inure to the benefit of the Depositor, the Trustee and MSMCI
and their respective successors and assigns.

      (b) Without in any way limiting the foregoing, the parties confirm that
this Assignment includes the rights relating to amendments or waivers under
the Agreement. Accordingly, the right of MSMCI to consent to any amendment of
the Agreement and its rights concerning waivers as set forth in Sections 11.02
and 8.02 of the Agreement shall be exercisable, to the extent any such
amendment or waiver affects the Specified Mortgage Loans or any of the rights
under the Agreement with respect thereto (other than the servicing of the
Specified Mortgage Loans, which shall be enforced by the Master Servicer) by
the Trustee as assignee of MSMCI.

      (c) It is expressly understood and agreed by the parties hereto that (i)
this Assignment is executed and delivered by LaSalle Bank National
Association, not individually or personally but solely on behalf of the Trust,
as the assignee, in the exercise of the powers and authority conferred and
vested in it, as Trustee, pursuant to the Pooling and Servicing Agreement
dated as of the date hereof among the Depositor, the Master Servicer, Wells
Fargo Bank, National Association, as securities administrator (the "Securities
Administrator") and the Trustee (the "Pooling and Servicing Agreement"), (ii)
each of the representations, undertakings and agreements herein made on the
part of assignee is made and intended not as personal representations,
undertakings and agreements by LaSalle Bank National Association but is made
and intended for the purpose of binding only the Trust, (iii) nothing herein
contained shall be construed as creating any liability for LaSalle Bank
National Association, individually or personally, to perform any covenant
(either express or implied) contained herein and (iv) under no circumstances
shall LaSalle Bank National Association be personally liable for the payment
of any indebtedness or expenses of the Trust, or be liable for the breach or
failure of any obligation, representation, warranty or covenant made or
undertaken by the Trust under this Assignment and (v) all recourse for any
payment liability or other obligation of the assignee shall be had solely to
the assets of the Trust.

3. Representations and Warranties

      (a) The Depositor represents and warrants that it is a sophisticated
investor able to evaluate the risks and merits of the transactions
contemplated hereby, and that it has not relied in connection therewith upon
any statements or representations of the Seller or MSMCI other than those
contained in the Agreement or this Assignment.

      (b) Each of the parties hereto represents and warrants that it is duly
and legally authorized to enter into this Assignment.

                                        2
<PAGE>

      (c) Each of the Depositor, MSMCI, Seller and Servicer hereto represents
and warrants that this Assignment has been duly authorized, executed and
delivered by it and (assuming due authorization, execution and delivery
thereof by each of the other parties hereto) constitutes its legal, valid and
binding obligation, enforceable against it in accordance with its terms,
except as such enforcement may be limited by bankruptcy, insolvency,
reorganization or other similar laws affecting the enforcement of creditors'
rights generally and by general equitable principles (regardless of whether
such enforcement is considered in a proceeding in equity or at law).

      (d) The Seller hereby makes, as of the Closing Date (as defined in the
Pooling and Servicing Agreement referred to below), the representations and
warranties set forth in Section 3.01 of the Agreement, to and for the benefit
of the Depositor, the Trustee and the Trust, and by this reference
incorporates such representations and warranties herein, as of such Closing
Date.

      (e) The Company hereby represents and warrants to the Assignee that, to
the extent the Mortgage Loans will be part of a REMIC, the Servicer shall
service the Mortgage Loans and any real property acquired upon default thereof
(including, without limitation, making or permitting any modification, waiver
or amendment of any term of any Mortgage Loan) in accordance with the
Servicing Agreement, but in no event in a manner that would (a) cause the
REMIC to fail or qualify as a REMIC or (b) result in the imposition of a tax
upon the REMIC (including, but not limited to, the tax on prohibited
transactions as defined in Section 860F(a)(2) of the Code, the tax on
contributions to a REMIC set forth in Section 860G(d) of the Code and the tax
on "net income from foreclosure property" as set forth in Section 860G(c) of
the Code).

      4. The Servicer hereby acknowledges that Wells Fargo Bank, National
Association has been appointed as the Master Servicer of the Specified
Mortgage Loans pursuant to the Pooling and Servicing Agreement and, therefore,
has the right to enforce all obligations of the Servicer under the Agreement.
Such rights will include, without limitation, the right to terminate the
Servicer under the Agreement upon the occurrence of an event of default
thereunder, the right to receive all remittances required to be made by the
Servicer under the Agreement, the right to receive all monthly reports and
other data required to be delivered by the Servicer under the Agreement, the
right to examine the books and records of the Servicer, indemnification rights
and the right to exercise certain rights of consent and approval of MSMCI. The
Servicer shall make all distributions under the Agreement to the Master
Servicer by wire transfer of immediately available funds to:

            Wells Fargo Bank, National Association
            ABA Number:        121-000-248
            Account Name:   Corporate Trust Clearing
            Account number:   3970771416
             For further credit to:   50981200, MSM 2007-1XS

      The Servicer shall deliver all reports required to be delivered under
the Agreement to the Master Servicer at the following address:

            Wells Fargo Bank, National Association
            9062 Old Annapolis Road
            Columbia, Maryland 21045
            Attention: Client Manager, MSM 2007-1XS
            Telecopier: (410) 715-2380

5.     Amendments to the Initial Agreement

                                      3
<PAGE>

      The parties to this Assignment hereby agree to amend the Initial
Agreement as follows:

      (a)    With respect to the Specified Mortgage Loans, "Permitted
            Investments" shall mean at any time, any one or more of the
            following obligations and securities:

            (i)    obligations of the United States or any agency thereof,
                  provided that such obligations are backed by the full faith
                  and credit of the United States;

            (ii)   general obligations of or obligations guaranteed by any
                  state of the United States or the District of Columbia
                  receiving the highest long-term debt rating of each Rating
                  Agency, or such lower rating as shall not result in the
                  downgrading or withdrawal of the ratings then assigned to
                  the Certificates by the Rating Agencies, as evidenced by a
                  signed writing delivered by each Rating Agency;

            (iii) commercial or finance company paper which is then receiving
                  the highest commercial or finance company paper rating of
                  each Rating Agency rating such paper, or such lower rating
                  as shall not result in the downgrading or withdrawal of the
                  ratings then assigned to the Certificates by the Rating
                  Agencies, as evidenced by a signed writing delivered by each
                  Rating Agency;

            (iv)   certificates of deposit, demand or time deposits, or
                  bankers' acceptances issued by any depository institution or
                  trust company incorporated under the laws of the United
                  States or of any state thereof and subject to supervision
                   and examination by federal and/or state banking authorities,
                  provided that the commercial paper and/or long-term
                  unsecured debt obligations of such depository institution or
                  trust company (or in the case of the principal depository
                  institution in a holding company system, the commercial
                  paper or long-term unsecured debt obligations of such
                  holding company, but only if Moody's is not the applicable
                  Rating Agency) are then rated one of the two highest
                  long-term and the highest short-term ratings of each Rating
                  Agency for such securities, or such lower ratings as shall
                   not result in the downgrading or withdrawal of the ratings
                  then assigned to the Certificates by the Rating Agencies, as
                  evidenced by a signed writing delivered by each Rating
                  Agency;

            (v)     demand or time deposits or certificates of deposit issued by
                  any bank or trust company or savings institution to the
                  extent that such deposits are fully insured by the FDIC;

            (vi)   guaranteed reinvestment agreements issued by any bank,
                  insurance company or other corporation acceptable to the
                  Rating Agencies at the time of the issuance of such
                  agreements, as evidenced by a signed writing delivered by
                   each Rating Agency;

            (vii) repurchase obligations with respect to any security
                  described in clauses (i) and (ii) above, in either case
                  entered into with a depository institution or trust company
                   (acting as principal) described in clause (iv) above;

            (viii)securities (other than stripped bonds, stripped coupons or
                  instruments sold at a purchase price in excess of 115% of
                  the face amount thereof) bearing interest or sold at a
                  discount issued by any corporation incorporated under the
                  laws of the United States or any state thereof which, at the
                  time of such

                                       4
<PAGE>

                  investment, have one of the two highest ratings of each
                  Rating Agency (except if the Rating Agency is Moody's, such
                  rating shall be the highest commercial paper rating of
                   Moody's for any such series), or such lower rating as shall
                  not result in the downgrading or withdrawal of the ratings
                  then assigned to the Certificates by the Rating Agencies, as
                  evidenced by a signed writing delivered by each Rating
                  Agency;

            (ix)   interests in any money market fund which at the date of
                  acquisition of the interests in such fund and throughout the
                  time such interests are held in such fund has the highest
                  applicable rating by each Rating Agency rating such fund or
                  such lower rating as shall not result in a change in the
                  rating then assigned to the Certificates by each Rating
                  Agency, as evidenced by a signed writing delivered by each
                  Rating Agency, including funds for which the Trustee, the
                  Master Servicer, the Securities Administrator or any of its
                   Affiliates is investment manager or adviser;

            (x)    short-term investment funds sponsored by any trust company
                  or national banking association incorporated under the laws
                  of the United States or any state thereof which on the date
                  of acquisition has been rated by each applicable Rating
                  Agency in their respective highest applicable rating
                  category or such lower rating as shall not result in a
                   change in the rating then specified stated maturity and
                  bearing interest or sold at a discount acceptable to each
                  Rating Agency as shall not result in the downgrading or
                  withdrawal of the ratings then assigned to the Certificates
                  by the Rating Agencies, as evidenced by a signed writing
                  delivered by each Rating Agency; and

            (xi)   such other investments having a specified stated maturity
                   and bearing interest or sold at a discount acceptable to the
                  Rating Agencies as shall not result in the downgrading or
                  withdrawal of the ratings then assigned to the Certificates
                  by the Rating Agencies, as evidenced by a signed writing
                  delivered by each Rating Agency;

                  provided, that no such instrument shall be a Permitted
                  Investment if (i) such instrument evidences the right to
                   receive interest only payments with respect to the
                  obligations underlying such instrument or (ii) such
                  instrument would require the Depositor to register as an
                  investment company under the Investment Company Act of 1940,
                  as amended.

      (b)    The definition of "Remittance Date" in Section 1.01 of the Initial
            Agreement is hereby amended and restated in its entirety as
            follows:

      "Remittance Date: The 18th day of each month (or, if such 18th day is
not a Business Day, the following Business Day)."

      (c)    The definition of "Servicing Fee" in Section 1.01 of the Initial
            Agreement is hereby amended and restated in its entirety as
            follows:

      "The Servicing Fee with respect to each Mortgage Loan for any calendar
month (or a portion thereof) shall be 1/12 of the product of (i) the Scheduled
Principal Balance of the Mortgage Loan and (ii) the Servicing Fee Rate
applicable to such Mortgage Loan. Such fee shall be payable monthly, computed
on the basis of the same principal amount and period respecting which any
related interest payment on a Mortgage Loan is computed."

                                      5
<PAGE>

      (d)    The definition of "Servicing Fee Rate" in Section 1.01 of the
            Initial Agreement is hereby amended and restated in its entirety
            as follows:

      "Servicing Fee Rate": With respect to the adjustable rate Mortgage
Loans, 0.250% per annum."

      (e)    Subsection 3.02(d) of the Initial Agreement is hereby amended and
            restated in its entirety as follows:

      "As of the Closing Date, none of the Mortgage Loans are contractually
past due by more than 30 days;"

      (f)    The following paragraphs are hereby incorporated into the Initial
            Agreement at the end of Section 4.13:

      "The Seller shall prepare for and deliver to the Purchaser, or its
designee, a statement with respect to each REO Property that has been rented
showing the aggregate rental income received and all expenses incurred in
connection with the maintenance of such REO Property at such times as is
necessary to enable the Purchaser, or its designee, to comply with the
reporting requirements of the REMIC Provisions. The net monthly rental income,
if any, from such REO Property shall be deposited in the Certificate Account
no later than the close of business on each Determination Date. The Seller
shall perform the tax reporting and withholding required by Sections 1445 and
6050J of the Code with respect to foreclosures and abandonments, the tax
reporting required by Section 6050H of the Code with respect to the receipt of
mortgage interest from individuals and any tax reporting required by Section
6050P of the Code with respect to the cancellation of indebtedness by certain
financial entities, by preparing such tax and information returns as may be
required, in the form required, and delivering the same to the Purchaser, or
its designee, for filing.

       Notwithstanding any other provision of this Agreement, no Mortgaged
Property acquired by the Purchaser, or its designee, shall be rented (or
allowed to continue to be rented) or otherwise used for the production of
income by or on behalf of the Purchaser, or its designee, in such a manner or
pursuant to any terms that would (i) cause such Mortgaged Property to fail to
qualify as "foreclosure property" within the meaning of section 860G(a)(8) of
the Code or (ii) subject any REMIC to the imposition of any federal, state or
local income taxes on the income earned from such Mortgaged Property under
Section 860G(c) of the Code or otherwise, unless the Seller has agreed to
indemnify and hold harmless the Purchaser, or its designee, with respect to
the imposition of any such taxes."

      (g)    The second paragraph of Section 5.01 of the Initial Agreement is
            hereby amended and restated in its entirety as follows:

      "With respect to any remittance received by the Purchaser after the
Business Day on which such payment was due, the Seller shall pay to the
Purchaser interest on any such late payment at an annual rate equal to the
Prime Rate, adjusted as of the date of each change, plus two percentage
points, but in no event greater than the maximum amount permitted by
applicable law. Such interest shall be deposited in the Custodial Account by
the Seller on the date such late payment is made and shall cover the period
commencing with such Business Day on which such payment was due and ending
with the Business Day on which such payment is made, both inclusive. Such
interest shall be remitted along with the distribution payable on the next
succeeding Remittance Date. The payment by the Seller of any such interest
shall not be deemed an extension of time for payment or a waiver of any Event
of Default by the Seller."

      (h)    The first paragraph of Section 5.02 of the Initial Agreement is
            hereby amended and restated in its entirety as follows:

      "Not later than the 5th Business Day of each month (or if such 5th day
is not a Business Day, the Business Day next succeeding such 5th day), the
Seller shall furnish to the Master Servicer in electronic

                                      6
<PAGE>

form mortgage loan level data as mutually agreed upon by the Seller and the
Master Servicer and the monthly reports substantially in the form of Exhibit J
attached hereto with respect to the Mortgage Loans and the period from but
including the first day of the preceding calendar month through but excluding
the first day of such month."

      (i)    The first paragraph of Section 5.03 of the Initial Agreement is
            hereby amended and restated in its entirety as follows:

      "Not later than the close of business on the Business Day preceding each
Remittance Date, the Seller shall either (a) deposit in the Custodial Account
from its own funds an amount equal to the principal and interest portion of
all Monthly Payments (with interest adjusted to the Mortgage Loan Remittance
Rate) which were due on the Mortgage Loans during the applicable Due Period
and which were delinquent at the close of business on the immediately
preceding Determination Date or which were deferred pursuant to Section 4.01,
(b) cause to be made an appropriate entry in the records of the Custodial
Account that amounts held for future distribution have been, as permitted by
this Section 5.03, used by the Seller in discharge of any such Monthly Advance
or (c) make Monthly Advances in the form of any combination of (a) or (b)
aggregating the total amount of Monthly Advances to be made, whether or not
deferred pursuant to Section 4.01, which were due on a Mortgage Loan on the
immediately preceding Due Date and delinquent at the close of business on the
related Determination Date."

      (j)    The word "or" is deleted from the end of Section 8.01(vii), the
            word "or" is added at the end of Section 8.01(viii) and the
            following paragraph is hereby incorporated into the Agreement as
            new Section 10.01(ix):

      "(ix) failure by the Seller to duly perform, within the required time
period, its obligations under Section 2.04 and Section 2.05 of the Reg AB
Addendum which failure continues unremedied for a period of fourteen (14) days
after the date on which written notice of such failure, requiring the same to
be remedied, shall have been given to the Seller by any party to this
Agreement or by any master servicer responsible for master servicing the
Mortgage Loans pursuant to a securitization of such Mortgage Loans;"

      (k)    The following paragraph is hereby incorporated into the Initial
            Agreement as new Section 11.19:

      "Third Party Beneficiary. For purposes of this Agreement, including but
not limited to Section 2.04 and Section 2.05, respectively, of the Reg AB
Addendum, any Master Servicer shall be considered a third party beneficiary to
this Agreement (including the Reg AB Addendum and any other amendments or
modifications thereto) entitled to all the rights and benefits accruing to any
Master Servicer herein as if it were a direct party to this Agreement."

      (l)    Section 6.04 and Section 6.05 are hereby deleted from the Initial
            Agreement, it being understood that they are superseded by Section
            2.04 and Section 2.05, respectively, of the Reg AB Addendum.

      (m)    The second sentence in Section 8.01 of the Initial Agreement is
            hereby replaced by the following:

      "On or after the receipt by the Seller of such written notice of
termination, all authority and power of the Seller, as servicer, under this
Agreement, whether with respect to the Mortgage Loans or otherwise, shall pass
to and be vested in the successor appointed pursuant to Section 11.01."

      (n)    Exhibit J to the Initial Agreement is hereby replaced in its
            entirety with the Amended and Restated Exhibit J attached to this
            Assignment as Exhibit II.

                                      7
<PAGE>

6. Amendments to the Reg AB Addendum

      (a)    Section 2.03(h) of the Reg AB Addendum is amended to also require
            that written notice provided pursuant to Section 2.03(f) shall be
            given in the form of Exhibit C.

      (b)    The phrase "March 1, but in no event later than" is hereby deleted
            from the first line of each of Section 2.04 and Section 2.05 of
            the Reg AB Addendum.

      (c)    Section 2.06(b) of the Reg AB Addendum is amended as follows:

            1. The first paragraph of Section 2.06(b) is amended to insert the
            phrase ", the Master Servicer, if any" after each occurrence of
            the phrase "the Purchaser".

            2. The last sentence of the second paragraph of Section 2.06(b) is
            amended to insert the phrase "and the other certifications" after
            the phrase "any assessment of compliance and attestation".

      (d)    Section 2.07(a) of the Reg AB Addendum is amended as follows:

            1. The phrase "including but not limited to any Master Servicer"
            is inserted before the phrase "responsible for the preparation,".

            2. The clause ", affiliates" is inserted before the words "and
            agents of each of the foregoing".

      (e)    Section 2.07(b)(ii) of the Reg AB Addendum is amended to delete
            the phrase "which continues unremedied for ten calendar days after
            the date on which such information, report, certification or
            accountants' letter was required to be delivered".

      (f)    Exhibit B to the Reg AB Addendum is replaced by Exhibit III
            hereto.

      (g)    Exhibit C to the Reg AB Addendum is replaced by Exhibit IV hereto.



7. Continuing Effect

      Except as contemplated hereby, the Agreement shall remain in full force
and effect in accordance with its terms.

8. Governing Law

      This Assignment and the rights and obligations hereunder shall be
governed by and construed in accordance with the internal laws of the State of
New York.

9. Notices

      Any notices or other communications permitted or required under the
Agreement to be made to the Depositor, MSMCI, the Seller, the Servicer and the
Trustee shall be made in accordance with the terms of the Agreement and shall
be sent as follows:

                                       8
<PAGE>

      In the case of MSMCI:

            Morgan Stanley Mortgage Capital Inc.
            1221 Avenue of the Americas
            New York, New York 10020
            Attention: Morgan Stanley Mortgage Loan Trust 2007-1XS

          With a copy to:

            Morgan Stanley & Co. Incorporated
            1585 Broadway
            New York, New York 10036
            Attention: General Counsel's Office

      In the case of the Depositor:

            Morgan Stanley Capital I Inc.
            1585 Broadway
            New York, New York 10036
            Attention:   Morgan Stanley Mortgage Loan Trust 2007-1XS

      In the case of the Trustee:

            LaSalle Bank National Association
            135 South LaSalle Street, Suite 1511
            Chicago, Illinois 60603
            Attention: Global Securities and Trust Services MSM 2007-1XS

      In the case of Wachovia and the Servicer:

            Wachovia Mortgage Corporation
            901 South Tryon Street
            Charlotte, North Carolina   28202
            Attention:   Kendal Leeson

         With a copy to:

            Wachovia Mortgage Corporation
            1100 Corporate Center Drive
            Raleigh, North Carolina   27607
            Attention:   Tom Fowler

or to such other address as may hereafter be furnished by the Depositor and
the Trustee to the parties in accordance with the provisions of the Agreement.

                                      9
<PAGE>

10. Ratification

       Except as modified and expressly amended by this Assignment, the
Agreement is in all respects ratified and confirmed, and all terms, provisions
and conditions thereof shall be and remain in full force and effect.

11. Counterparts

      This Assignment may be executed in counterparts, each of which when so
executed shall be deemed to be an original and all of which when taken
together shall constitute one and the same instrument.

12. Definitions

      Any capitalized term used but not defined in this Assignment has the
same meaning as in the Agreement.

                           [SIGNATURE PAGE FOLLOWS]


                                      10
<PAGE>


      IN WITNESS WHEREOF, the parties hereto have executed this Assignment the
day and year first above written.

                                           MORGAN STANLEY MORTGAGE CAPITAL INC.


                                          By: /s/ Valerie Kay
                                              ----------------------------------
                                               Name:   Valerie Kay
                                              Title: Vice President


                                          MORGAN STANLEY CAPITAL I INC.


                                          By: /s/ Valerie Kay
                                               ----------------------------------
                                              Name:   Valerie Kay
                                              Title: Vice President


                                          WACHOVIA   MORTGAGE CORPORATION


                                          By: /s/ Kendal A. Leeson
                                              ----------------------------------
                                              Name:   Kendal A. Leeson
                                               Title: Vice President




Acknowledged and Agreed:
WELLS FARGO BANK, NATIONAL
ASSOCIATION, as Master Servicer


By: /s/ Martin Reed
    -----------------------------------
    Name:   Martin Reed
    Title: Vice President

LASALLE BANK, NATIONAL
ASSOCIATION, as Trustee of Morgan Stanley
Mortgage Loan Trust 2007-1XS


By: /s/ Susan L. Feld
    -----------------------------------
Name:   Susan L. Feld
Title: Assistant Vice President


<PAGE>


                                   EXHIBIT I

                             Mortgage Loan Schedule

              [see Schedule A to Pooling and Servicing Agreement]


<PAGE>

Exhibit IIA: Standard File Layout - Delinquency Reporting

<TABLE>
<CAPTION>

----------------------------------------------------------------------------------------------------
Column/Header Name                                 Description                  Decimal   Format
                                                                                       Comment
----------------------------------------------------------------------------------------------------
<S>                                 <C>                                         <C>       <C>
SERVICER_LOAN_NBR                   A unique number assigned to a loan by the             
                                   Servicer.   This may be different than the
                                   LOAN_NBR
----------------------------------------------------------------------------------------------------
LOAN_NBR                             A unique identifier assigned to each loan            
                                   by the originator.
----------------------------------------------------------------------------------------------------
CLIENT_NBR                          Servicer Client Number
----------------------------------------------------------------------------------------------------
SERV_INVESTOR_NBR                   Contains a unique number as assigned by an
                                   external servicer to identify a group of
                                   loans in their system.
----------------------------------------------------------------------------------------------------
BORROWER_FIRST_NAME                 First Name of the Borrower.
----------------------------------------------------------------------------------------------------
BORROWER_LAST_NAME                  Last name of the borrower.
----------------------------------------------------------------------------------------------------
PROP_ADDRESS                        Street Name and Number of Property                   
----------------------------------------------------------------------------------------------------
PROP_STATE                          The state where the   property located.                
---------------------------------------------------------------------------


 
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