Summary of Investments by State Classification as of December 31, 2007
    

    

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Years Bonds Callable — Weighted Average Call Protection: 6 Years

Cost (Book) Yield^(b) — Weighted Average Book Yield: 5.5%

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Performance of $10,000 Investment — Class A and D

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Average Annual Total Returns — Period Ended December 31, 2007

Performance data quoted represents past performance, which is no guarantee of future results and current performance may be lower or higher than the figures shown. For most recent month-end performance figures, please visit www.morganstanley.com/msim or speak with your Financial Advisor. Investment returns and principal value will fluctuate and fund shares, when redeemed, may be worth more or less than their original cost. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. Performance for Class A, Class B, Class C, and Class D shares will vary due to differences in sales charges and expenses.

Prior to July 28, 1997 the Fund offered only one class of shares. Because the distribution arrangement for Class A most closely resembled the distribution arrangement applicable prior to the implementation of multiple classes (i.e., Class A is sold with a front-end sales charge), historical performance information has been restated to reflect the actual maximum sales charge applicable to Class A (i.e., 4.25%) as compared to the 4.00% sales charge in effect prior to July 28, 1997. In addition, Class A shares are now subject to an ongoing 12b-1 fee which is reflected in the restated performance for that class.

Because all shares of the Fund held prior to July 28, 1997 were designated Class D shares, the Fund’s historical performance has been restated to reflect the absence of any sales charge.

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As a shareholder of the Fund, you incur two types of costs: (1) transaction costs, including sales charges (loads) on purchase payments and redemption fees; and (2) ongoing costs, including advisory fees; distribution and service (12b-1) fees; and other Fund expenses. This example is intended to help you understand your ongoing costs (in dollars) of investing in the Fund and to compare these costs with the ongoing costs of investing in other mutual funds.

The example is based on an investment of $1,000 invested at the beginning of the period and held for the entire period 07/01/07 – 12/31/07.

Actual Expenses

The first line of the table below provides information about actual account values and actual expenses. You may use the information in this line, together with the amount you invested, to estimate the expenses that you paid over the period. Simply divide your account value by $1,000 (for example, an $8,600 account value divided by $1,000 = 8.6), then multiply the result by the number in the first line under the heading entitled ‘‘Expenses Paid During Period’’ to estimate the expenses you paid on your account during this period.

Hypothetical Example for Comparison Purposes

The second line of the table below provides information about hypothetical expenses based on the Fund’s actual expense ratio and an assumed rate of return of 5% per year before expenses, which is not the Fund’s actual return. The hypothetical account values and expenses may not be used to estimate the actual ending account balance or expenses you paid for the period. You may use this information to compare the ongoing cost of investing in the Fund and other funds. To do so, compare this 5% hypothetical example with the 5% hypothetical examples that appear in the shareholder reports of the other funds.

Please note that the expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any transactional costs, such as sales charges (loads) and redemption fees. Therefore, the second line of the table is useful in comparing ongoing costs, and will not help you determine the relative total cost of owning different funds. In addition, if these transactional costs were included, your costs would have been higher.

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Morgan Stanley Tax-Exempt Securities Trust

Portfolio of Investments December 31, 2007

See Notes to Financial Statements

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Portfolio of Investments December 31, 2007 continued

See Notes to Financial Statements

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Portfolio of Investments December 31, 2007 continued

See Notes to Financial Statements

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Portfolio of Investments December 31, 2007 continued

See Notes to Financial Statements

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Portfolio of Investments December 31, 2007 continued

See Notes to Financial Statements

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Portfolio of Investments December 31, 2007 continued

See Notes to Financial Statements

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Portfolio of Investments December 31, 2007 continued

See Notes to Financial Statements

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Morgan Stanley Tax-Exempt Securities Trust

Portfolio of Investments December 31, 2007 continued

See Notes to Financial Statements

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Morgan Stanley Tax-Exempt Securities Trust

Portfolio of Investments December 31, 2007 continued

See Notes to Financial Statements

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Portfolio of Investments December 31, 2007 continued

See Notes to Financial Statements

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Portfolio of Investments December 31, 2007 continued

Futures Contracts Open at December 31, 2007:

See Notes to Financial Statements

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Morgan Stanley Tax-Exempt Securities Trust

Financial Statements

Statement of Assets and Liabilities

December 31, 2007

See Notes to Financial Statements

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Morgan Stanley Tax-Exempt Securities Trust

Financial Statements continued

Statement of Operations

For the year ended December 31, 2007

See Notes to Financial Statements

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Morgan Stanley Tax-Exempt Securities Trust

Financial Statements continued

Statements of Changes in Net Assets

See Notes to Financial Statements

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Morgan Stanley Tax-Exempt Securities Trust

Notes to Financial Statements December 31, 2007

1.   Organization and Accounting Policies

Morgan Stanley Tax-Exempt Securities Trust (the ‘‘Fund’’) is registered under the Investment Company Act of 1940, as amended (the ‘‘Act’’), as a diversified, open-end management investment company. The Fund’s investment objective is to provide a high level of current income which is exempt from federal income tax, consistent with the preservation of capital. The Fund was incorporated in Maryland on December 31, 1979, commenced operations on March 27, 1980 and reorganized as a Massachusetts business trust on April 30, 1987. On July 28, 1997, the Fund converted to a multiple class share structure.

The Fund offers Class A shares, Class B shares, Class C shares and Class D shares. The four classes are substantially the same except that most Class A shares are subject to a sales charge imposed at the time of purchase and some Class A shares, and most Class B shares and Class C shares are subject to a contingent deferred sales charge imposed on shares redeemed within eighteen months, six years and one year, respectively. Class D shares are not subject to a sales charge. Additionally, Class A shares, Class B shares and Class C shares incur distribution expenses.

The Fund will assess a 2% redemption fee on Class A shares, Class B shares, Class C shares, and Class D shares, which is paid directly to the Fund, for shares redeemed or exchanged within seven days of purchase, subject to certain exceptions. The redemption fee is designed to protect the Fund and its remaining shareholders from the effects of short-term trading.

The following is a summary of significant accounting policies:

A.   Valuation of Investments — (1) portfolio securities are valued by an outside independent pricing service approved by the Trustees. The pricing service uses both a computerized grid matrix of tax-exempt securities and evaluations by its staff, in each case based on information concerning market transactions and quotations from dealers which reflect the mean between the last reported bid and asked price. The portfolio securities are thus valued by reference to a combination of transactions and quotations for the same or other securities believed to be comparable in quality, coupon, maturity, type of issue, call provisions, trading characteristics and other features deemed to be relevant. The Trustees believe that timely and reliable market quotations are generally not readily available for purposes of valuing tax-exempt securities and that the valuations supplied by the pricing service are more likely to approximate the fair value of such securities; (2) futures are valued at the latest sale price on the commodities exchange on which they trade unless it is determined that such price does not reflect their market value, in which case they will be valued at their fair value as determined in good faith under procedures established by and under the supervision of the Trustees; (3) investments in open-end mutual funds, including the Morgan Stanley Institutional Liquidity Funds, are valued at the net asset value as of the close of each business day; and (4) short-term debt securities having a maturity date of more than sixty days at time of purchase are valued on a mark-to-market basis until sixty days prior to maturity and thereafter at amortized cost based on their value on the 61st day. Short-term debt securities having a maturity date of sixty days or less at the time of purchase are valued at amortized cost.

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Notes to Financial Statements December 31, 2007 continued

B.   Accounting for Investments — Security transactions are accounted for on the trade date (date the order to buy or sell is executed). Realized gains and losses on security transactions are determined by the identified cost method. Discounts are accreted and premiums are amortized over the life of the respective securities and are included in interest income. Interest income is accrued daily.

C.   Multiple Class Allocations — Investment income, expenses (other than distribution fees), and realized and unrealized gains and losses are allocated to each class of shares based upon the relative net asset value on the date such items are recognized. Distribution fees are charged directly to the respective class.

D.   Floating Rate Note Obligations Related to Securities Held — The Fund enters into transactions in which it transfers to Dealer Trusts (‘‘Dealer Trusts’’), fixed rate bonds in exchange for cash and residual interests in the Dealer Trusts’ assets and cash flows, which are in the form of inverse floating rate investments. The Dealer Trusts fund the purchases of the fixed rate bonds by issuing floating rate notes to third parties and allowing the Fund to retain residual interest in the bonds. The Fund enters into shortfall agreements with the Dealer Trusts which commit the Fund to pay the Dealer Trusts, in certain circumstances, the difference between the liquidation value of the fixed rate bonds held by the Dealer Trusts and the liquidation value of the floating rate notes held by third parties, as well as any shortfalls in interest cash flows. The residual interests held by the Fund (inverse floating rate investments) include the right of the Fund (1) to cause the holders of the floating rate notes to tender their notes at par at the next interest rate reset date, and (2) to transfer the municipal bond from the Dealer Trusts to the Fund, thereby collapsing the Dealer Trusts. The Fund accounts for the transfer of bonds to the Dealer Trusts as secured borrowings, with the securities transferred remaining in the Fund’s investment assets, and the related floating rate notes reflected as Fund liabilities under the caption ‘‘Floating rate note obligations’’ on the Statement of Assets and Liabilities. The Fund records the interest income from the fixed rate bonds under the caption ‘‘Interest Income’’ and records the expenses related to floating rate note obligations and any administrative expenses of the Dealer Trusts under the caption ‘‘Interest and residual trust expenses’’ on the Statement of Operations. The notes issued by the Dealer Trusts have interest rates that reset weekly and the floating rate note holders have the option to tender their notes to the Dealer Trusts for redemption at par at each reset date. At December 31, 2007, Fund investments with a value of $62,851,387 are held by the Dealer Trusts and serve as collateral for the $43,570,000 in floating rate note obligations outstanding at that date. Contractual maturities of the floating rate note obligations and interest rates in effect at December 31, 2007 are presented in the Portfolio of Investments.

E.   Futures Contracts — A futures contract is an agreement between two parties to buy and sell financial instruments or contracts based on financial indices at a set price on a future date. Upon entering into such a contract, the Fund is required to pledge to the broker cash, U.S. Government securities or other liquid portfolio securities equal to the minimum initial margin requirements of the applicable futures exchange. Pursuant to the contract, the Fund agrees to receive from or pay to the broker an amount of cash equal to the daily fluctuation in the value of the contract. Such receipts or payments known as variation margin are

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Morgan Stanley Tax-Exempt Securities Trust

Notes to Financial Statements December 31, 2007 continued

recorded by the Fund as unrealized gains and losses. Upon closing of the contract, the Fund realizes a gain or loss equal to the difference between the value of the contract at the time it was opened and the value at the time it was closed.

F.   Federal Income Tax Policy — It is the Fund’s policy to comply with the requirements of Subchapter M of the Internal Revenue Code applicable to regulated investment companies and to distribute substantially all of its taxable income to its shareholders. Therefore, no provision for federal income taxes is required. The Fund files tax returns with the U.S. Internal Revenue Service and New York. The Fund adopted the provisions of the Financial Accounting Standards Board (‘‘FASB’’) Interpretation No. 48 (‘‘FIN 48’’) Accounting for Uncertainty in Income Taxes on June 29, 2007. FIN 48 sets forth a minimum threshold for financial statement recognition of the benefit of a tax position taken or expected to be taken in a tax return. The implementation of FIN 48 did not result in any unrecognized tax benefits in the accompanying financial statements. If applicable, the Fund recognizes interest accrued related to unrecognized tax benefits in interest expense and penalties in other expenses in the Statement of Operations. Each of the tax years in the four year period ended December 31, 2007, remains subject to examination by taxing authorities.

G.   Dividends and Distributions to Shareholders — Dividends and distributions to shareholders are recorded on the ex-dividend date.

H.   Use of Estimates — The preparation of financial statements in accordance with generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts and disclosures. Actual results could differ from those estimates.

2.   Investment Advisory/Administration Agreements

Pursuant to an Investment Advisory Agreement with Morgan Stanley Investment Advisors Inc. (the ‘‘Investment Adviser’’), the Fund pays the Investment Adviser an advisory fee, accrued daily and payable monthly, by applying the following annual rates to the Fund’s net assets determined as of the close of each business day: 0.42% to the portion of the daily net assets not exceeding $500 million; 0.345% to the portion of the daily net assets exceeding $500 million but not exceeding $750 million; 0.295% to the portion of the daily net assets exceeding $750 million but not exceeding $1 billion; 0.27% to the portion of the daily net assets exceeding $1 billion but not exceeding $1.25 billion; 0.245% to the portion of the daily net assets exceeding $1.25 billion but not exceeding $2.5 billion; and 0.22% to the portion of the daily net assets exceeding $2.5 billion.

Pursuant to an Administration Agreement with Morgan Stanley Services Company Inc. (the ‘‘Administrator’’), an affiliate of the Investment Adviser, the Fund pays an administration fee, accrued daily and payable monthly, by applying the annual rate of 0.08% to the Fund’s daily net assets.

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Notes to Financial Statements December 31, 2007 continued

Under an agreement between the Administrator and State Street Bank and Trust Company (‘‘State Street’’), State Street provides certain administrative services to the Fund. For such services, the Administrator pays State Street a portion of the fee the Administrator receives from the Fund.

3.   Plan of Distribution

Shares of the Fund are distributed by Morgan Stanley Distributors Inc. (the ‘‘Distributor’’), an affiliate of the Investment Adviser and Administrator. The Fund has adopted a Plan of Distribution (the ‘‘Plan’’) pursuant to Rule 12b-1 under the Act. The Plan provides that the Fund will pay the Distributor a fee which is accrued daily and paid monthly at the following annual rates: (i) Class A – up to 0.25% of the average daily net assets of Class A shares; (ii) Class B – up to 0.60% of the average daily net assets of Class B shares; and (iii) Class C – up to 0.70% of the average daily net assets of Class C shares.

In the case of Class B shares, provided that the Plan continues in effect, any cumulative expenses incurred by the Distributor but not yet recovered may be recovered through the payment of future distribution fees from the Fund pursuant to the Plan and contingent deferred sales charges paid by investors upon redemption of Class B shares. Although there is no legal obligation for the Fund to pay expenses incurred in excess of payments made to the Distributor under the Plan and the proceeds of contingent deferred sales charges paid by investors upon redemption of shares, if for any reason the Plan is terminated, the Trustees will consider at that time the manner in which to treat such expenses. The Distributor has advised the Fund that such excess amounts totaled $4,014,758 at December 31, 2007.

In the case of Class A shares and Class C shares, expenses incurred pursuant to the Plan in any calendar year in excess of 0.25% or 0.70% of the average daily net assets of Class A or Class C, respectively, will not be reimbursed by the Fund through payments in any subsequent year, except that expenses representing a gross sales credit to Morgan Stanley Financial Advisors and other authorized financial representatives at the time of sale may be reimbursed in the subsequent calendar year. For the year ended December 31, 2007, the distribution fee was accrued for Class A shares and Class C shares at the annual rate of 0.24% and
0.70%, respectively.

The Distributor has informed the Fund that for the year ended December 31, 2007, it received contingent deferred sales charges from certain redemptions of the Fund’s Class A shares, Class B shares and Class C shares of $98, $110,164 and $1,383, respectively and received $84,491 in front-end sales charges from sales of the Fund’s Class A shares. The respective shareholders pay such charges which are not an expense of the Fund.

4.   Security Transactions and Transactions with Affiliates

The Fund invests in Morgan Stanley Institutional Liquidity Tax-Exempt Portfolio – Institutional Class, an open-end management investment company managed by the Investment Adviser. Investment advisory fees

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Notes to Financial Statements December 31, 2007 continued

paid by the Fund are reduced by an amount equal to the advisory and administrative service fees paid by Morgan Stanley Institutional Liquidity Tax-Exempt Portfolio – Institutional Class with respect to assets invested by the Fund in Morgan Stanley Institutional Liquidity Tax-Exempt Portfolio – Institutional Class. For the year ended December 31, 2007, advisory fees paid were reduced by $11,443 relating to the Fund’s investment in Morgan Stanley Institutional Liquidity Tax-Exempt Portfolio – Institutional Class. Income distributions earned by the Fund are recorded as dividends from affiliate in the Statement of Operations and totaled $450,020 for the year ended December 31, 2007. During the year ended December 31, 2007, cost of purchases and sales of investments in Morgan Stanley Institutional Liquidity Tax-Exempt Portfolio – Institutional Class aggregated $112,626,308 and $101,156,396, respectively.

The cost of purchases and proceeds from sales of portfolio securities, excluding short-term investments, for the year ended December 31, 2007 aggregated $70,190,291 and $156,167,400, respectively.

Morgan Stanley Trust, an affiliate of the Investment Adviser, Administrator and Distributor, is the Fund’s transfer agent.

The Fund has an unfunded noncontributory defined benefit pension plan covering certain independent Trustees of the Fund who will have served as independent Trustees for at least five years at the time of retirement. Benefits under this plan are based on factors which include years of service and compensation. The Trustees voted to close the plan to new participants and eliminate the future benefits growth due to increases to compensation after July 31, 2003. Aggregate pension costs for the year ended December 31, 2007, included in Trustees’ fees and expenses in the Statement of Operations amounted to $13,527. At December 31, 2007, the Fund had an accrued pension liability of $112,311 which is included in accrued expenses in the Statement of Assets and Liabilities.

The Fund has an unfunded Deferred Compensation Plan (the ‘‘Compensation Plan’’) which allows each independent Trustee to defer payment of all, or a portion, of the fees he or she receives for serving on the Board of Trustees. Each eligible Trustee generally may elect to have the deferred amounts credited with a return equal to the total return on one or more of the Morgan Stanley funds that are offered as investment options under the Compensation Plan. Appreciation/depreciation and distributions received from these investments are recorded with an offsetting increase/decrease in the deferred compensation obligation and do not affect the net asset value of the Fund.

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Notes to Financial Statements December 31, 2007 continued

5.   Shares of Beneficial Interest

Transactions in shares of beneficial interest were as follows:

6.   Federal Income Tax Status

The amount of dividends and distributions from net investment income and net realized capital gains are determined in accordance with federal income tax regulations which may differ from generally accepted accounting principles. These ‘‘book/tax’’ differences are either considered temporary or permanent in nature. To the extent these differences are permanent in nature, such amounts are reclassified within the capital

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Notes to Financial Statements December 31, 2007 continued

accounts based on their federal tax-basis treatment; temporary differences do not require reclassification. Dividends and distributions which exceed net investment income and net realized capital gains for tax purposes are reported as distributions of paid-in-capital.

The tax character of distributions paid was as follows:

As of December 31, 2007, the tax-basis components of accumulated earnings were as follows:

As of December 31, 2007, the Fund had temporary book/tax differences primarily attributable to book amortization of discounts on debt securities and mark-to-market of open futures contracts.

Permanent differences, due to a nondeductible expense and tax adjustments on debt securities sold by the Fund, resulted in the following reclassifications among the Fund’s components of net assets at December 31, 2007:

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Notes to Financial Statements December 31, 2007 continued

7.   Expense Offset

The expense offset represents a reduction of the fees and expenses for interest earned on cash balances maintained by the Fund with the transfer agent and custodian.

8.   Purposes of and Risks Relating to Certain Financial Instruments

The Fund may invest a portion of its assets in inverse floating rate instruments, either through outright purchases of inverse floating rate securities or through the transfer of bonds to a Dealer Trust in exchange for cash and residual interests in the Dealer Trust. These investments are typically used by the Fund in seeking to enhance the yield of the portfolio. These instruments typically involve greater risks than a fixed rate municipal bond. In particular, these instruments are acquired through leverage or may have leverage embedded in them and therefore, involve many of the risks associated with leverage. Leverage is a speculative technique that may expose the Fund to greater risk and increased costs. Leverage may cause the Fund’s net asset value to be more volatile than if it had not been leveraged because leverage tends to magnify the effect of any increases or decreases in the value of the Fund’s portfolio securities. The use of leverage may also cause the Fund to liquidate portfolio positions when it may not be advantageous to do so in order to satisfy its obligations with respect to inverse floating rate instruments.

To hedge against adverse interest rate changes, the Fund may invest in financial futures contracts or municipal bond index futures contracts (‘‘futures contracts’’).

These futures contracts involve elements of market risk in excess of the amount reflected in the Statement of Assets and Liabilities. The Fund bears the risk of an unfavorable change in the value of the underlying securities. Risks may also arise upon entering into these contracts from the potential inability of the counterparties to meet the terms of their contracts.

9.   Accounting Pronouncement

In September 2006, Statement of Financial Accounting Standards No. 157, Fair Value Measurements (SFAS 157), was issued and is effective for fiscal years beginning after November 15, 2007. SFAS 157 defines fair value, establishes a framework for measuring fair value and expands disclosures about fair value measurements. Management is currently evaluating the impact the adoption of SFAS 157 will have on the Fund’s financial statement disclosures.

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Financial Highlights

Selected ratios and per share data for a share of beneficial interest outstanding throughout each period:

See Notes to Financial Statements

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Financial Highlights continued

See Notes to Financial Statements

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Financial Highlights continued

See Notes to Financial Statements

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See Notes to Financial Statements

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Morgan Stanley Tax-Exempt Securities Trust

Report of Independent Registered Public Accounting Firm

To the Shareholders and Board of Trustees of
Morgan Stanley Tax-Exempt Securities Trust:

We have audited the accompanying statement of assets and liabilities of Morgan Stanley Tax-Exempt Securities Trust (the ‘‘Fund’’), including the portfolio of investments, as of December 31, 2007, and the related statements of operations for the year then ended and changes in net assets for each of the two years in the period then ended, and the financial highlights for each of the five years in the period then ended. These financial statements and financial highlights are the responsibility of the Fund’s management. Our responsibility is to express an opinion on these financial statements and financial highlights based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements and financial highlights are free of material misstatement. The Fund is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. Our audits included consideration of internal control over financial reporting as a basis for designing audit procedures that are appropriate in the circumstances, but not for the purpose of expressing an opinion on the effectiveness of the Fund’s internal control over financial reporting. Accordingly, we express no such opinion. An audit also includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. Our procedures included confirmation of securities owned as of December 31, 2007, by correspondence with the custodian and brokers. We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the financial statements and financial highlights referred to above present fairly, in all material respects, the financial position of Morgan Stanley Tax-Exempt Securities Trust as of December 31, 2007, the results of its operations for the year then ended, the changes in its net assets for each of the two years in the period then ended, and the financial highlights for each of the five years in the period then ended, in conformity with accounting principles generally accepted in the United States of America.

Deloitte & Touche LLP
New York, New York
February 26, 2008

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Trustee and Officer Information  (unaudited)

Independent Trustees:

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Interested Trustee:

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Trustee and Officer Information  (unaudited) continued

Executive Officers:

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Trustee and Officer Information  (unaudited) continued

    

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