MUNICIPAL INCOME OPPORTUNITIES TRUST/MA
N-30D, 1994-01-25
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<PAGE>   1
 
                      MUNICIPAL INCOME OPPORTUNITIES TRUST
                             Two World Trade Center
                            New York, New York 10048
 
DEAR SHAREHOLDER:
- --------------------------------------------------------------------------------
 
     We are pleased to present the semiannual report on the operations of
Municipal Income Opportunities Trust (NYSE symbol: OIA) for the six months ended
November 30, 1993.
 
MARKET CONDITIONS
 
     Long-term interest rates were near their lowest levels in almost 20 years
for much of the period under review. The passage and signing of the Clinton
administration's Revenue Reconciliation Act during the summer made higher
marginal income tax rates a reality and strengthened demand for tax-exempt
bonds. Over the past six months, municipal bond yields, as measured by The Bond
Buyer Revenue Bond Index, fell 77 basis points from 6.48 percent to 5.71
percent.
 
     Municipal issuers continued to take advantage of lower interest rates by
refunding older, higher-coupon debt at an unprecedented pace. A new record for
underwriting volume has already been set this year. The total of $261 billion
issued during the first 11 months of 1993 surpassed the previous high of $235
billion for all of 1992. Refundings accounted for two-thirds of total new-issue
sales. Underwritings backed by insurance represented 37 percent of the new-issue
market.
 
PERFORMANCE
 
     Municipal Income Opportunities Trust's total returns for the six-month and
trailing 12-month periods ended November 30, 1993 were 3.76 percent and 13.22
percent, respectively, based on a closing New York Stock Exchange (NYSE) market
price of $8.25 per share.
 
     We anticipate that the change in investment policy approved by shareholders
at the end of February will result in a gradual upgrading of portfolio quality
with improved prospects for timely payment of interest and principal. However,
10 credits representing 4.4 percent of the Fund's assets remained non-performing
at the end of the period. These loans were in the nursing and health related,
multi-family housing and industrial development/pollution control revenue
sectors. In the coming months we will continue our efforts to either liquidate
or rehabilitate problem loans.
 
     On November 30, 1993, the Fund declared a monthly dividend of $0.0525 per
share payable on December 23, 1993 to shareholders of record on December 10,
1993. For the six-month period, OIA paid shareholders income dividends totaling
$0.315 per share. The Fund has maintained its level of monthly dividend payments
despite the persistent decline in interest rates. Future dividend payments,
however, could be affected by redemptions or sales of older, high-coupon bonds
with reduced call protection.
<PAGE>   2
 
PORTFOLIO STRUCTURE
 
     The Fund remained fully invested in long-term municipal securities. The
portfolio was diversified among 11 municipal sectors and 55 separate issuers. In
keeping with OIA's primary objective of providing high current income, non-rated
securities represented 78 percent of long-term holdings. The portfolio's three
largest municipal sectors were hospital, industrial development/pollution
control and nursing and health related facilities revenue bonds. These sectors
represent 58 percent of municipal bond investments. The average maturity and
call protection of the Fund's long-term holdings were 21 years and 7 years,
respectively. Bonds subject to the alternative minimum tax comprised 14 percent
of the portfolio.
 
     We would like to remind you that the Trustees have approved a procedure
whereby the Fund, when appropriate, may attempt to reduce or eliminate a market
value discount from net asset value by repurchasing shares in the open market or
in privately negotiated transactions at a price not above market value, if any,
or net asset value, whichever is lower at the time of purchase.
 
     We appreciate your support of Municipal Income Opportunities Trust and look
forward to continuing to serve your investment needs and objectives.
 
                                          Very truly yours,

                                          /s/ C. FIUMEFREDDO 
                                          ----------------------
                                          Charles A. Fiumefreddo
                                          Chairman of the Board
<PAGE>   3
 
MUNICIPAL INCOME OPPORTUNITIES TRUST
PORTFOLIO OF INVESTMENTS November 30, 1993 (unaudited)
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
Principal
Amount (in                                                                     Coupon     Maturity
thousands)                                                                      Rate        Date          Value
- ----------                                                                     ------     --------     ------------
<C>           <S>                                                              <C>        <C>          <C>
              MUNICIPAL BONDS (94.4%)
              GENERAL OBLIGATION (1.9%)
 $  2,000     New York City, New York, 1994 Ser D..........................     5.75 %     8/15/10     $  1,948,180
    1,395     Southwest Travis County Road District #1, Texas, Ser 1985
                (Prerefunded)..............................................    10.625      9/ 1/09        1,555,551
                                                                                                       ------------
                                                                                                          3,503,731
                                                                                                       ------------
              EDUCATIONAL FACILITIES REVENUE (0.5%)
    1,000     New York State Dormitory Authority, State University Refg Ser
                1993 A.....................................................     5.25       5/15/15          937,590
                                                                                                       ------------
              HOSPITAL REVENUE (9.0%)
    2,000     Corona, California, Vista Hospital System Inc Ser 1992 B
                COPs.......................................................     9.50       7/ 1/20        2,190,780
    3,500     Wilmington, Delaware, Osteopathic Hospital Association of
                Delaware/Riverside Hospital Ser A 1988 (Prerefunded).......    10.20      10/ 1/18        4,444,300
              Illinois Health Facilities Authority,
    1,600       Delnor Community Hospital Ser 1989 (Prerefunded)...........     8.00       5/15/19        1,902,832
    1,065       Hinsdale Hospital Ser 1990 C...............................     9.50      11/15/19        1,302,932
    1,935       Hinsdale Hospital Ser 1990 C (Prerefunded).................     9.50      11/15/19        2,537,191
    1,995     Philadelphia Hospitals & Higher Education Facilities
                Authority, Pennsylvania, Methodist Hospital Ser A..........     9.00       7/ 1/10        2,129,064
    1,990     Buena Vista Industrial Development Authority, Virginia,
                Stonewall Jackson Hospital Ser 1987........................     8.375     11/ 1/14        2,133,777
                                                                                                       ------------
                                                                                                         16,640,876
                                                                                                       ------------
              INDUSTRIAL DEVELOPMENT/POLLUTION CONTROL
              REVENUE (19.2%)
    2,000     Delaware Economic Development Authority, Syntek Inc Ser 1989
                (AMT)(a)...................................................    11.25       5/ 1/09           20,000
      485     Metropolitan Washington Airports Authority, District of
                Columbia, Caterair Intl Corp Ser 1991 (AMT)................    10.125      9/ 1/11          517,199
              Broward County, Florida, Graphic Dynamics Inc
    1,740       Ser 1989 A (AMT)(a)........................................    10.625      3/ 1/00          417,600
    5,960       Ser 1989 B (AMT)(a)........................................    10.625      3/ 1/10        1,430,400
    1,595     Illinois Development Finance Authority, Custom Tapes Inc
                Refg Ser 1989..............................................    10.50       5/ 1/19        1,630,887
    3,580     Columbus, Indiana, PCL Packaging - Midwest Inc
                Refg Ser 1988 (AMT)(a).....................................    10.50      12/ 1/00        1,432,000
    4,060     Detroit Economic Development Corporation, Michigan, North
                Industrial Park LP Ser 1989................................    11.375      2/15/14        4,429,866
    1,730     Michigan Strategic Fund, Kasle Steel Corp Ser 1989 (AMT).....     9.375     10/ 1/06        1,904,624
    5,000     Cleveland, Ohio, Continental Airlines Inc Ser 1990 (AMT).....     9.00      12/ 1/19        5,169,300
    2,000     Dayton, Ohio, Emery Air Freight Corp Ser 1988 A..............    12.50      10/ 1/09        2,290,000
    1,250     Zanesville - Muskingum County Port Authority, Ohio, Anchor
                Glass Ser 1989 B (AMT).....................................    10.25      12/ 1/08        1,372,075
    2,354     Butler County Industrial Development Authority, Pennsylvania,
                Morgan Management Co Ser 1976..............................     8.75      11/15/03        2,581,828
    4,270     East Hempfield Township Industrial Development Authority,
                Pennsylvania, Herley Microwave System Inc Ser 1989 A.......    10.40       6/ 1/04        4,741,280
              Lexington County, South Carolina, Ellett Brothers
    2,850       Refg Ser 1988..............................................    10.625      9/ 1/02        3,070,647
    4,250       Refg Ser 1988..............................................    10.625      9/ 1/08        4,581,245
                                                                                                       ------------
                                                                                                         35,588,951
                                                                                                       ------------
              MORTGAGE REVENUE -- MULTI-FAMILY (5.5%)
              Broward County, Florida,
    1,600       Green Turtle Apts Ser 1989 B (AMT)(a)......................    10.50       2/ 1/19          320,000
    2,500       Pinewood Heights Apts Ser 1989 A (AMT)(a)..................    10.25       2/ 1/19          500,000
    2,000     Dade County Housing Finance Authority, Florida, Arena Square
                North & South 1989 Ser 2 (AMT)(a)..........................    10.25       5/ 1/19        1,280,000
</TABLE>
<PAGE>   4
 
MUNICIPAL INCOME OPPORTUNITIES TRUST
PORTFOLIO OF INVESTMENTS November 30, 1993 (unaudited) (continued)
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
Principal
Amount (in                                                                     Coupon     Maturity
thousands)                                                                      Rate        Date          Value
- ----------                                                                     ------     --------     ------------
<C>           <S>                                                              <C>        <C>          <C>
              Washington County Housing & Redevelopment Authority,
                Minnesota, Courtly Park Townhomes
 $  3,885       Ser 1989 A.................................................     9.75 %     6/15/19     $  2,408,700
    1,165       Ser 1989 A (AMT)...........................................    10.25       6/15/19          722,300
   24,080       Ser 1989 B.................................................     0.00       6/15/19          963,199
    8,678       Ser 1989 B (AMT)...........................................     0.00       6/15/19          347,115
              White Bear Lake, Minnesota, White Bear Woods Apts Phase II
    3,715       Refg 1989 Ser A............................................     9.75       6/15/19        2,600,500
   23,786       Refg 1989 Ser B............................................     0.00       6/15/19        1,010,902
                                                                                                       ------------
                                                                                                         10,152,716
                                                                                                       ------------
              MORTGAGE REVENUE -- SINGLE FAMILY (11.6%)
    5,000     Alaska Housing Finance Corporation, Ins 1993 1st Ser.........     5.90      12/ 1/33        4,950,000
   64,658     San Francisco, California, Ser 1982..........................     0.00      10/ 1/14        6,806,610
      875     Broward County Housing Finance Authority, Florida, Home Ser
                1989 A.....................................................    10.00      10/ 1/03          895,055
   67,920     New Hampshire Housing Finance Authority, Residential 1983 Ser
                B..........................................................     0.00       1/ 1/15        7,315,663
    1,500     Rhode Island Housing & Mortgage Finance Corporation,
                Homeownership 1988 Ser 1 - B (AMT).........................     8.40      10/ 1/22        1,629,615
                                                                                                       ------------
                                                                                                         21,596,943
                                                                                                       ------------
              NURSING & HEALTH RELATED FACILITIES REVENUE (27.0%)
    1,235     Vista, California, Long-Term Care Foundation of America
                Ser 1989 COPs(a)(c)........................................     9.875      1/ 1/20          741,000
              Escambia County, Florida, Pensacola Care Development Centers
    2,105       Ser 1989...................................................    10.25       7/ 1/11        2,401,616
    9,225       Ser 1989 A.................................................    10.25       7/ 1/11       10,524,895
    9,000     Flagler County Industrial Development Authority, Florida,
                RHA/South Florida Properties Inc Ser 1988 A................    10.50      12/ 1/18        9,594,720
    1,500     Winchester, Indiana, Hoosier Care II Inc Ser 1990............    10.375      6/ 1/20        1,610,640
    2,565     Jefferson County, Kentucky, AHF/Kentucky - Iowa Inc Ser
                1990.......................................................    10.25       1/ 1/20        2,791,438
    1,600     Westside Habilitation Center, Louisiana Intermediate Care
                Facility for the Mentally Retarded Refg Ser 1993...........     8.375     10/ 1/13        1,628,016
    3,600     Massachusetts Industrial Finance Agency, Vinfen Corp Ser
                1993(when-issued)..........................................     7.10      11/15/18        3,591,000
    6,400     McCurtain County Development Authority, Oklahoma, Heartway
                Corp Ser 1989 A - 2........................................    10.25       3/ 1/19        6,208,000
    1,000     Bucks County Industrial Development Authority, Pennsylvania,
                RHA/Mill Run Ser 1989......................................    10.00       7/ 1/00          790,000
    1,490     Maury County Health & Educational Facilities Board,
                Tennessee, Southern Healthcare/Heritage Manor of Monteagle
                Ser 1990E..................................................    10.50       3/ 1/20        1,605,937
    4,790     Kirbyville, Health Facilities Development Corporation, Texas,
                Heartway III Corp Ser 1988 A...............................    11.25       3/20/21        4,167,300
    3,995     North Central Texas Health Facilities Development
                Corporation, C C Young Memorial Home Ser 1988..............    10.50      12/ 1/13        4,356,548
                                                                                                       ------------
                                                                                                         50,011,110
                                                                                                       ------------
              PUBLIC FACILITIES REVENUE (3.1%)
              Jacksonville, Florida, Greater Jacksonville Fair Assoc.
      940       Ser 1989...................................................     8.875      3/ 1/94          963,697
    1,025       Ser 1989...................................................     8.875      3/ 1/95        1,048,575
    1,115       Ser 1989...................................................     8.875      3/ 1/96        1,140,645
    1,215       Ser 1989...................................................     8.875      3/ 1/97        1,242,945
    1,320       Ser 1989...................................................     8.875      3/ 1/98        1,350,360
    1,120     LaSalle County Jail Facilities Finance Corporation, Texas,
                Criminal Detention Center Ser 1989(a)......................     9.75       8/ 1/09              112
                                                                                                       ------------
                                                                                                          5,746,334
                                                                                                       ------------
              RETIREMENT FACILITIES & LIFECARE REVENUE (9.8%)
    1,000     Colorado Health Facilities Authority, Liberty Heights Ser
                A..........................................................    10.00       7/ 1/19          550,000
              Connecticut Development Authority, Seabury Life Care
    3,230       Ser 1991...................................................    10.00       9/ 1/04        3,509,104
    1,000       Ser 1991...................................................    10.00       9/ 1/16        1,086,410
</TABLE>
<PAGE>   5
 
MUNICIPAL INCOME OPPORTUNITIES TRUST
PORTFOLIO OF INVESTMENTS November 30, 1993 (unaudited) (continued)
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
Principal
Amount (in                                                                     Coupon     Maturity
thousands)                                                                      Rate        Date          Value
- ----------                                                                     ------     --------     ------------
<C>           <S>                                                              <C>        <C>          <C>
 $  4,965     Volusia County Health Facilities Authority, Florida, John
                Knox Village Center 1988 Ser A(b)..........................    11.125%     9/ 1/17     $  4,369,200
    5,919     Ann Arbor Economic Development Corporation, Michigan, Glacier
                Hills Inc Ser 1989.........................................    10.375      1/15/19        5,164,327
    3,000     Independence Industrial Development Authority, Missouri,
                Greenbriar Meadows Ser 1989 A (AMT)(a).....................    10.25       8/ 1/19        2,100,000
    1,500     Charlotte Housing Authority, North Carolina, Merrywood Senior
                Adult Community Ser 1989 A (AMT)...........................     9.75       5/ 1/19        1,440,000
                                                                                                       ------------
                                                                                                         18,219,041
                                                                                                       ------------
              TAX ALLOCATION (3.9%)
    2,000     Bridgeview, Illinois, Ser 1991...............................     9.50       1/ 1/11        2,155,200
    4,800     Crestwood, Illinois, Ser 1988................................    10.50      12/ 1/08        5,046,240
                                                                                                       ------------
                                                                                                          7,201,440
                                                                                                       ------------
              TRANSPORTATION FACILITIES REVENUE (2.9%)
    4,500     Denver, Colorado, Airport Ser 1991 A (AMT)...................     8.75      11/15/23        5,323,680
                                                                                                       ------------
              TOTAL MUNICIPAL BONDS
              (IDENTIFIED COST $190,251,706)...............................                             174,922,412
                                                                                                       ------------
              SHORT-TERM MUNICIPAL OBLIGATIONS (5.0%)
    5,200     Houston Health Facilities Development Corporation, Texas,
                Methodist Hospital (Tender 12/1/93)........................     1.90*     12/ 1/14        5,200,000
    4,000     Texas Water Development Board, Ser 1992 A (Tender 12/1/93)...     1.90*      3/ 1/15        4,000,000
                                                                                                       ------------
              TOTAL SHORT-TERM MUNICIPAL OBLIGATIONS
              (IDENTIFIED COST $9,200,000)...........................................                     9,200,000
                                                                                                       ------------
              TOTAL INVESTMENTS (IDENTIFIED COST $199,451,706)(D)....................        99.4%      184,122,412
              CASH AND OTHER ASSETS IN EXCESS OF LIABILITIES.........................          0.6        1,106,427
                                                                                            ------     ------------
              NET ASSETS.............................................................       100.0%     $185,228,839
                                                                                            ------     ------------
                                                                                            ------     ------------
</TABLE>
 
- ---------------
  * Variable or floating rate securities. Coupon rate shown reflects current
    rate.
(a) Non-income producing, bond in default.
(b) Partial interest paid. Interest income is recorded as received.
(c) Resale is restricted to qualified accredited investors.
(d) The aggregate cost for federal income tax purposes is $199,451,706; the
    aggregate gross unrealized appreciation is $10,631,911 and the aggregate
    gross unrealized depreciation is $25,961,205, resulting in net unrealized
    depreciation of $15,329,294.
 
                       See Notes to Financial Statements
<PAGE>   6
 
MUNICIPAL INCOME OPPORTUNITIES TRUST
FINANCIAL STATEMENTS
- --------------------------------------------------------------------------------
 
<TABLE>
<S>                                          <C>
STATEMENT OF ASSETS AND LIABILITIES
November 30, 1993 (unaudited)
- -------------------------------------------
ASSETS:
Investments in securities, at value
  (identified cost $199,451,706) (Note
  1).......................................  $ 184,122,412
Cash.......................................        152,726
Receivables for:
  Interest.................................      4,380,219
  Investments sold.........................        274,456
Prepaid expenses...........................        211,078
                                             -------------
        TOTAL ASSETS.......................    189,140,891
                                             -------------
LIABILITIES:
Payable for investments purchased..........      3,635,500
Investment advisory fee payable (Note 2)...         80,941
Administration fee payable (Note 3)........         48,565
Accrued expenses (Note 4)..................        147,046
                                             -------------
        TOTAL LIABILITIES..................      3,912,052
                                             -------------
NET ASSETS:
Paid in capital............................    202,537,509
Accumulated realized loss on
  investments - net........................     (2,644,068)
Unrealized depreciation of investments -
  net......................................    (15,329,294)
Accumulated undistributed investment
  income - net.............................        664,692
                                             -------------
        NET ASSETS.........................  $ 185,228,839
                                             -------------
                                             -------------
NET ASSET VALUE PER SHARE,
  21,460,172 shares outstanding (unlimited
  shares authorized of $.01 par value).....          $8.63
                                                     -----
                                                     -----
STATEMENT OF OPERATIONS For the six months
ended November 30, 1993 (unaudited)
- -------------------------------------------
INVESTMENT INCOME:
 INTEREST INCOME...........................  $   8,297,431
                                             -------------
 EXPENSES
  Investment advisory fee (Note 2).........        462,759
  Administration fee (Note 3)..............        277,655
  Professional fees........................         90,878
  Transfer agent fees and expenses (Note
    4).....................................         73,200
  Shareholder reports and notices (Note
    4).....................................         26,535
  Registration fees........................         15,863
  Trustees' fees and expenses (Note 4).....         15,260
  Organizational expenses (Note 1).........          2,651
  Other....................................         34,386
                                             -------------
    TOTAL EXPENSES.........................        999,187
                                             -------------
      INVESTMENT INCOME - NET..............      7,298,244
                                             -------------
REALIZED AND UNREALIZED GAIN (LOSS)
  ON INVESTMENTS -- NET (NOTE 1):
  Realized loss on investments - net.......     (2,614,441)
  Change in unrealized depreciation on
    investments - net......................      3,205,341
                                             -------------
    NET GAIN ON INVESTMENTS................        590,900
                                             -------------
      NET INCREASE IN NET ASSETS
        RESULTING FROM OPERATIONS..........  $   7,889,144
                                             -------------
                                             -------------
</TABLE>
 
STATEMENT OF CHANGES IN NET ASSETS
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                                For the six
                                                                               months ended              For the
                                                                             November 30, 1993         year ended
                                                                                (unaudited)           May 31, 1993
                                                                            -------------------    -------------------
<S>                                                                         <C>                    <C>
INCREASE (DECREASE) IN NET ASSETS:
  Operations:
    Investment income - net...............................................     $   7,298,244         $    13,848,270
    Realized gain (loss) on investments - net.............................        (2,614,441)                525,048
    Change in unrealized depreciation on investments - net................         3,205,341              (8,174,711)
                                                                            -------------------    -------------------
        Net increase in net assets resulting from operations..............         7,889,144               6,198,607
                                                                            -------------------    -------------------
  Dividends and distributions to shareholders from:
    Investment income - net...............................................        (6,759,954)            (14,250,702)
    Realized gain on investments - net....................................               -0-                (537,654)
                                                                            -------------------    -------------------
  Total dividends and distributions.......................................        (6,759,954)            (14,788,356)
                                                                            -------------------    -------------------
  Transactions in shares of beneficial interest - net decrease (Note 6)...               -0-              (2,161,157)
                                                                            -------------------    -------------------
        Total increase (decrease).........................................         1,129,190             (10,750,906)
NET ASSETS:
  Beginning of period.....................................................       184,099,649             194,850,555
                                                                            -------------------    -------------------
  END OF PERIOD (including undistributed net investment income of $664,692
   and $126,402, respectively)............................................     $ 185,228,839         $   184,099,649
                                                                            -------------------    -------------------
                                                                            -------------------    -------------------
</TABLE>
 
                       See Notes to Financial Statements
<PAGE>   7
 
MUNICIPAL INCOME OPPORTUNITIES TRUST
NOTES TO FINANCIAL STATEMENTS (unaudited)
- --------------------------------------------------------------------------------
1.  ORGANIZATION AND ACCOUNTING POLICIES -- Municipal Income Opportunities Trust
(the "Fund") is registered under the Investment Company Act of 1940, as amended
(the "Act"), as a diversified, closed-end management investment company. It was
organized on June 22, 1988 as a Massachusetts business trust and commenced
operations on September 19, 1988.
 
     The following is a summary of significant accounting policies:
 
     A. Valuation of Investments -- Portfolio securities are valued for the Fund
     by an outside independent pricing service approved by the Fund's Trustees.
     The pricing service has informed the Fund that in valuing the Fund's
     portfolio securities, it 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 bid side of the market each day. The Fund's 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.
 
     B. Accounting for Investments -- Security transactions are accounted for on
     the trade date (date the order to buy or sell is executed). In computing
     net investment income, the Fund amortizes premiums and original issue
     discounts. Additionally, with respect to market discount on bonds purchased
     after April 30, 1993, a portion of any capital gain realized upon
     disposition is recharacterized as taxable investment income. Realized gains
     and losses on security transactions are determined on the identified cost
     method. Interest income is accrued daily, except where collection is not
     expected.
 
     C. Federal Income Tax Status -- It is the Fund's policy to comply with the
     requirements of the Internal Revenue Code applicable to regulated
     investment companies and to distribute all of its taxable and nontaxable
     income to its shareholders. Accordingly, no federal income tax provision is
     required.
 
     D. Dividends and Distributions to Shareholders -- The Fund records
     dividends and distributions to its shareholders on the ex-dividend date.
 
     E. Organizational Expenses -- The Fund's Administrator paid the
     organizational expenses of the Fund in the amount of $44,615. The Fund
     reimbursed the Administrator for such expenses which were fully amortized
     as of September 18, 1993.
 
2.  INVESTMENT ADVISORY AGREEMENT -- Pursuant to an Investment Advisory
Agreement (the "Advisory Agreement") with Dean Witter InterCapital Inc. (the
"Investment Adviser"), the Fund pays its Investment Advisor an advisory fee,
calculated weekly and payable monthly, by applying the annual rate of 0.50% to
the Fund's average weekly net assets.
 
     Under the terms of the Advisory Agreement, the Investment Adviser manages
the Fund's assets. Also, the Investment Adviser pays the salaries of all
personnel, including officers of the Fund, who are employees of the Investment
Adviser.
 
3.  ADMINISTRATION AGREEMENT -- Pursuant to an Administration Agreement (the
"Administration Agreement") with Dean Witter InterCapital Inc. (the
"Administrator"), the Fund pays its Administrator an administration fee,
calculated weekly and payable monthly, by applying the annual rate of 0.30% to
the Fund's average weekly net assets.
<PAGE>   8
 
MUNICIPAL INCOME OPPORTUNITIES TRUST
NOTES TO FINANCIAL STATEMENTS (unaudited) (continued)
- --------------------------------------------------------------------------------
 
     Under the terms of the Administration Agreement, the Administrator
maintains certain of the Fund's books and records and furnishes, at its own
expense, such office space, facilities, equipment, clerical help, bookkeeping
and certain legal services as the Fund may reasonably require in the conduct of
its business. In addition, the Administrator pays the salaries of all personnel,
including officers of the Fund, who are employees of the Administrator.
 
4.  SECURITY TRANSACTIONS AND TRANSACTIONS WITH AFFILIATES -- The cost of
purchases and the proceeds from sales of portfolio securities for the six months
ended November 30, 1993, excluding short-term investments, aggregated
$13,523,079 and $18,642,981, respectively.
 
     On April 1, 1991 the Fund established an unfunded noncontributory defined
benefit pension plan covering all 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 years of service and
compensation during the last five years of service. Aggregate pension costs for
the six months ended November 30, 1993, included in Trustees' fees and expenses
in the Statement of Operations, amounted to $5,282. At November 30, 1993 the
Fund had an accrued pension liability of $37,446 which is included in accrued
expenses in the Statement of Assets and Liabilities.
 
     Dean Witter Trust Company, an affiliate of the Investment
Adviser/Administrator, is the Fund's transfer agent. During the six months ended
November 30, 1993, the Fund incurred transfer agent fees and expenses of $73,200
of which $49,107 was payable at November 30, 1993.
 
     Bowne & Co., Inc. is an affiliate of the Fund by virtue of a Common Fund
Trustee and Director of Bowne & Co. During the six months ended November 30,
1993 the Fund paid Bowne & Co., Inc. $4,578 for printing of shareholder reports.
 
5.  FEDERAL INCOME TAX STATUS -- Capital losses incurred after October 31,
within the taxable year are deemed to arise on the first business day of the
Fund's next taxable year. The Fund incurred and elected to defer a net capital
loss of approximately $38,000 during such period in fiscal 1993. For the six
months ended November 30, 1993, the Fund incurred approximately $2,614,000 of
net capital losses.
 
6.  SHARES OF BENEFICIAL INTEREST -- Transactions in shares of beneficial
interest were as follows:
 
<TABLE>
<CAPTION>
                                                                        Par          Capital
                                                                       Value         Paid in
                                                                         of         Excess of
                                                         Shares        Shares       Par Value
                                                       ----------     --------     ------------
<S>                                                    <C>            <C>          <C>
Balance, May 31, 1992................................  21,729,572     $217,295     $204,481,371
Treasury shares purchased and retired (weighted
  average discount 8.79%)*...........................    (269,400)      (2,694)      (2,158,463)
                                                       ----------     --------     ------------
Balance, May 31, 1993 and November 30, 1993..........  21,460,172     $214,601     $202,322,908
                                                       ----------     --------     ------------
                                                       ----------     --------     ------------
</TABLE>
 
- ---------------
* The Trustees have voted to retire the shares repurchased.
<PAGE>   9
 
MUNICIPAL INCOME OPPORTUNITIES TRUST
NOTES TO FINANCIAL STATEMENTS (unaudited) (continued)
- --------------------------------------------------------------------------------
 
7.  DIVIDENDS -- The Fund has declared the following dividends from net
investment income --
 
<TABLE>
<CAPTION>
          Declaration        Amount Per          Record                Payable
              Date             Share              Date                  Date
       ------------------    ----------     -----------------     -----------------
<S>    <C>                   <C>            <C>                   <C>
       November 30, 1993      $ 0.0525      December 10, 1993     December 23, 1993
       December 28, 1993      $ 0.0525      January 7, 1994       January 21, 1994
</TABLE>
 
8.  SELECTED QUARTERLY FINANCIAL DATA --
 
<TABLE>
<CAPTION>
                                                                                      Quarters Ended*
                                                                            -----------------------------------
                                                                                11/30/93           8/31/93
                                                                            ----------------   ----------------
                                                                                       Per                Per
                                                                             Total    Share     Total    Share
                                                                            -------   ------   -------   ------
<S>                                                                         <C>       <C>      <C>       <C>
Total investment income...................................................  $ 3,999   $ 0.19   $ 4,298   $ 0.20
Investment income - net...................................................    3,506     0.16     3,792     0.18
Realized and unrealized gain (loss) on investments - net..................      (23)   (0.00)      614     0.03
</TABLE>
 
<TABLE>
<CAPTION>
                                                                   Quarters Ended*
                                      -------------------------------------------------------------------------
                                          5/31/93            2/28/93            11/30/92           8/31/92
                                      ----------------   ----------------   ----------------   ----------------
                                                 Per                Per                Per                Per
                                       Total    Share     Total    Share     Total    Share     Total    Share
                                      -------   ------   -------   ------   -------   ------   -------   ------
<S>                                   <C>       <C>      <C>       <C>      <C>       <C>      <C>       <C>
Total investment income.............. $ 3,322   $ 0.15   $ 4,082   $ 0.19   $ 4,378   $ 0.20   $ 4,254   $ 0.20
Investment income - net..............   2,708     0.12     3,575     0.17     3,852     0.18     3,713     0.17
Realized and unrealized gain (loss)
  on investments - net...............  (5,037)   (0.23)      660     0.03      (674)   (0.03)   (2,599)   (0.11)
</TABLE>
 
- ---------------
* Totals expressed in thousands of dollars.
<PAGE>   10
 
MUNICIPAL INCOME OPPORTUNITIES TRUST
FINANCIAL HIGHLIGHTS (unaudited)
- --------------------------------------------------------------------------------
Selected data and ratios for a share of beneficial interest outstanding
throughout each period:
 
<TABLE>
<CAPTION>
                                                                                                         For the
                             For the six                                                                 period
                             months ended                 For the year ended May 31,                  September 19,
                             November 30,     ---------------------------------------------------     1988* through
                                 1993           1993          1992          1991          1990        May 31, 1989
                             ------------     ---------     ---------     ---------     ---------     -------------
<S>                          <C>              <C>           <C>           <C>           <C>           <C>
PER SHARE OPERATING
  PERFORMANCE:
  Net asset value, beginning
    of period................  $     8.58     $    8.97     $    9.39     $    9.44     $    9.56       $    9.40
                             ------------     ---------     ---------     ---------     ---------     -------------
    Investment
      income - net...........        0.34          0.64          0.74          0.79          0.81            0.45
    Realized and unrealized
      gain (loss) on invest-
      ments - net............        0.03         (0.34)        (0.43)        (0.02)        (0.09)           0.09
                             ------------     ---------     ---------     ---------     ---------     -------------
  Total from investment
    operations...............        0.37          0.30          0.31          0.77          0.72            0.54
                             ------------     ---------     ---------     ---------     ---------     -------------
  Less dividends,
    distributions and other
    charges:
    Dividends from net
      investment income......       (0.32)        (0.66)        (0.73)        (0.82)        (0.84)          (0.37)
    Distributions from net
      realized gain on
      investments............         -0-         (0.03)          -0-           -0-           -0-**           -0-
    Offering costs charged
      against capital........         -0-           -0-           -0-           -0-           -0-           (0.01)
                             ------------     ---------     ---------     ---------     ---------     -------------
  Total dividends,
    distributions and other
    charges..................       (0.32)        (0.69)        (0.73)        (0.82)        (0.84)          (0.38)
                             ------------     ---------     ---------     ---------     ---------     -------------
  Net asset value, end of
    period...................  $     8.63     $    8.58     $    8.97     $    9.39     $    9.44       $    9.56
                             ------------     ---------     ---------     ---------     ---------     -------------
                             ------------     ---------     ---------     ---------     ---------     -------------
  Market value, end of
    period...................  $     8.25     $    8.25     $   9.325     $   9.875     $   10.25       $   10.50
                             ------------     ---------     ---------     ---------     ---------     -------------
                             ------------     ---------     ---------     ---------     ---------     -------------
TOTAL INVESTMENT RETURN+.....        3.76%(1)     (4.71)%        2.64%         4.99%         6.11%           9.08%(1)
RATIOS/SUPPLEMENTAL DATA:
  Net assets, end of period
    (in thousands)...........  $  185,229     $ 184,100     $ 194,851     $ 202,418     $ 199,173       $ 194,698
  Ratio of expenses to
    average net assets.......        1.08%(2)      1.15%         1.08%         1.10%         1.10%           1.11%(2)
  Ratio of net investment
    income to average net
    assets...................        7.89%(2)      7.27%         8.00%         8.37%         8.61%           7.03%(2)
  Portfolio turnover rate....           8%            2%            4%            7%            8%              9%
</TABLE>
 
- ---------------
  * Commencement of operations.
 
 ** Includes distributions of $.0003 per share.
 
  + Total investment return is based upon the current market value on the first
    and last day of each period reported. Dividends and distributions are
    assumed to be reinvested at the prices obtained under the Fund's dividend
    reinvestment plan. Total investment return does not reflect sales charges or
    brokerage commissions.
 
(1) Not annualized.
 
(2) Annualized.
 
                       See Notes to Financial Statements
- --------------------------------------------------------------------------------
 
  The financial statements included herein have been taken from the records of
the Fund without examination by the independent accountants and accordingly they
do not express an opinion thereon.
<PAGE>   11
 
                       THIS PAGE INTENTIONALLY LEFT BLANK
<PAGE>   12

TRUSTEES
Jack F. Bennett
Charles A. Fiumefreddo
Edwin J. Garn
John R. Haire
Dr. John E. Jeuck
Dr. Manuel H. Johnson
Paul Kolton
Michael E. Nugent
Albert T. Sommers
Edward R. Telling

OFFICERS
Charles A. Fiumefreddo
Chairman and Chief Executive Officer

Sheldon Curtis
Vice President, Secretary and General Counsel

James F. Willison
Vice President

Thomas F. Caloia
Treasurer

TRANSFER AGENT
Dean Witter Trust Company
Harborside Financial Center - Plaza Two
Jersey City, New Jersey 07311

LEGAL COUNSEL
Sheldon Curtis
Two World Trade Center
New York, New York  10048

INDEPENDENT ACCOUNTANTS
Price Waterhouse
1177 Avenue of the Americas
New York, New York  10036

INVESTMENT MANAGER
Dean Witter InterCapital Inc.
Two World Trade Center
New York, New York  10048


MUNICIPAL
INCOME
OPPORTUNITIES
TRUST


Semiannual Report
November 30, 1993



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