PAGE 1 000 B000000 05/31/2010 000 C000000 0000835333 000 D000000 N 000 E000000 NF 000 F000000 Y 000 G000000 N 000 H000000 N 000 I000000 6.1 000 J000000 A 001 A000000 INVESCO MUNICIPAL INCOME OPPORTUNITIES TRUST 001 B000000 811-05597 001 C000000 7136261919 002 A000000 11 GREENWAY PLAZA 002 B000000 HOUSTON 002 C000000 TX 002 D010000 77046 003 000000 N 004 000000 N 005 000000 N 006 000000 N 007 A000000 N 007 B000000 0 007 C010100 1 008 A000001 MORGAN STANLEY INVESTMENT ADVISORS INC. 008 B000001 A 008 C000001 801-42061 008 D010001 NEW YORK 008 D020001 NY 008 D030001 10036 010 A000001 MORGAN STANLEY SERVICES COMPANY INC. 010 B000001 8-00000 010 C010001 JERSEY CITY 010 C020001 NJ 010 C030001 07311 012 A000001 COMPUTERSHARE TRUST COMPANY, N.A. 012 B000001 84-00000 012 C010001 PROVIDENCE 012 C020001 RI 012 C030001 02940 012 C040001 3078 013 A000001 PRICEWATERHOUSE COOPERS, LLP 013 B010001 HOUSTON 013 B020001 TX 013 B030001 77002 014 A000001 ARIGIL MENKUL DEGERLER A.S. 014 B000001 8-00000 014 A000002 BANK MORGAN STANLEY AG 014 B000002 8-00000 014 A000003 BETTER ALTERNATIVE TRADING SYSTEM 014 B000003 8-00000 014 A000004 BLOCK INTEREST DISCOVERY SERVICE PAGE 2 014 B000004 8-00000 014 A000005 CHINA INTERNATIONAL CAPITAL CORP. HONG KONG S 014 B000005 8-00000 014 A000006 H.C. SECURITIES AND INVESTMENTS 014 B000006 8-00000 014 A000007 HTI VALORI MOBILIARE S.A. 014 B000007 8-00000 014 A000008 MORGAN STANLEY & CO. INTERNATIONAL PLC 014 B000008 8-00000 014 A000009 MORGAN STANLEY & CO. INCORPORATED 014 B000009 8-15869 014 A000010 MORGAN STANLEY DEAN WITTER ASIA (SINGAPORE) P 014 B000010 8-00000 014 A000011 MORGAN STANLEY ASIA LIMITED 014 B000011 8-00000 014 A000012 MORGAN STANLEY SECURITIES LIMITED 014 B000012 8-00000 014 A000013 MORGAN STANLEY CANADA LIMITED 014 B000013 8-00000 014 A000014 MORGAN STANLEY DEAN WITTER C.T.V.M. S.A. 014 B000014 8-00000 014 A000015 MORGAN STANLEY DISTRIBUTION, INC. 014 B000015 8-44766 014 A000016 MORGAN STANLEY DISTRIBUTORS, INC. 014 B000016 8-45262 014 A000017 MORGAN STANLEY DEAN WITTER AUSTRALIA LIMITED 014 B000017 8-00000 014 A000018 MORGAN STANLEY FUTURES (HONG KONG) LIMITED 014 B000018 8-00000 014 A000019 MORGAN STANLEY INDIA COMPANY PRIVATE LTD. 014 B000019 8-00000 014 A000020 MORGAN STANLEY HONG KONG SECURITIES LIMITED 014 B000020 8-00000 014 A000021 MORGAN STANLEY MARKET PRODUCTS INC. 014 B000021 8-37795 014 A000022 MORGAN STANLEY JAPAN SECURITIES CO., LTD. 014 B000022 8-00000 014 A000023 MORGAN STANLEY TAIWAN LIMITED 014 B000023 8-00000 014 A000024 MORGAN STANLEY, S.V. S.A. 014 B000024 8-00000 014 A000025 MS SECURITIES SERVICES INC. 014 B000025 8-26804 014 A000026 OOO MORGAN STANLEY BANK 014 B000026 8-00000 014 A000027 MUNICENTER 014 B000027 8-00000 014 A000028 PRIME DEALER SERVICES CORP. 014 B000028 8-47025 014 A000029 RMB MORGAN STANLEY 014 B000029 8-00000 PAGE 3 014 A000030 VAM KAMPEN FUNDS 014 B000030 8-19412 014 A000031 BANK OF TOKYO - MITSUBISHI UFJ LTD. 014 B000031 8-00000 014 A000032 MITSUBISHI UFJ SECURITIES CO. LTD 014 B000032 8-00000 014 A000033 MITSUBISHI UFJ SECURITIES INTERNATIONAL PLC 014 B000033 8-00000 014 A000034 MITSUBISHI UFJ TRUST & BANKING CORP. 014 B000034 8-00000 014 A000035 MORGAN STANLEY DEAN WITTER AUSTRALIA SECURITI 014 B000035 8-00000 014 A000036 MORGAN STANLEY SMITH BARNEY, LLC 014 B000036 8-68191 014 A000037 UNION BANC INVESTMENT SERVICES 014 B000037 8-30706 014 A000038 MORGAN STANLEY ASIA (SINGAPORE) SECURITIES PT 014 B000038 8-00000 014 A000039 MORGAN STANLEY MUFG SECURITIES CO., LTD. 014 B000039 8-00000 014 A000040 MORGAN STANLEY INDIA FINANCIAL SERVICES PRIVA 014 B000040 8-00000 014 A000041 MORGAN STANLEY SMITH BARNEY FINANCING, LLC 014 B000041 8-00000 014 A000042 MORGAN STANLEY SMITH BARNEY AUSTRALIA PTY LTD 014 B000042 8-00000 014 A000043 OLIVETREE SECURITIES LTD 014 B000043 8-00000 014 A000044 MITSUBISHI UFJ MORGAN STANLEY SECURITIES CO. 014 B000044 8-00000 015 A000001 STATE STREET BANK AND TRUST COMPANY 015 B000001 C 015 C010001 BOSTON 015 C020001 MA 015 C030001 02111 015 E010001 X 018 000000 Y 019 A000000 Y 019 B000000 232 019 C000000 INVESCOFDS 021 000000 0 022 A000001 MORGAN (J.P) SECURITIES INC. 022 B000001 13-3224016 022 C000001 15545 022 D000001 15866 022 A000002 GOLDMAN SACHS & CO. 022 B000002 13-5108880 022 C000002 4160 022 D000002 1766 022 A000003 BANC OF AMERICA SECURITIES LLC 022 B000003 56-2058405 PAGE 4 022 C000003 2400 022 D000003 2200 022 A000004 WACHOVIA CAPITAL MARKETS 022 B000004 22-1147033 022 C000004 2393 022 D000004 2000 022 A000005 ZIEGLER SECURITIES 022 B000005 39-0727640 022 C000005 3845 022 D000005 0 022 A000006 STATE STREET BANK AND TRUST CO. 022 B000006 04-1867445 022 C000006 757 022 D000006 2148 022 A000007 MSIM - CROSS TR 022 C000007 0 022 D000007 2312 022 A000008 MERRILL LYNCH & CO., INC. 022 B000008 13-5674085 022 C000008 1134 022 D000008 1117 022 A000009 RAYMOND JAMES & ASSOCIATES, INC. 022 B000009 59-1237041 022 C000009 1559 022 D000009 0 022 A000010 MESIROW FINANCIAL 022 B000010 36-3194849 022 C000010 1279 022 D000010 188 023 C000000 38968 023 D000000 34384 024 000000 N 026 A000000 N 026 B000000 Y 026 C000000 N 026 D000000 Y 026 E000000 N 026 F000000 Y 026 G010000 N 026 G020000 N 026 H000000 N 027 000000 N 028 A010000 0 028 A020000 0 028 A030000 0 028 A040000 0 028 B010000 0 028 B020000 0 028 B030000 0 028 B040000 0 028 C010000 0 PAGE 5 028 C020000 0 028 C030000 0 028 C040000 0 028 D010000 0 028 D020000 0 028 D030000 0 028 D040000 0 028 E010000 0 028 E020000 0 028 E030000 0 028 E040000 0 028 F010000 0 028 F020000 0 028 F030000 0 028 F040000 0 028 G010000 0 028 G020000 0 028 G030000 0 028 G040000 0 028 H000000 0 030 A000000 0 030 B000000 0.00 030 C000000 0.00 031 A000000 0 031 B000000 0 032 000000 0 033 000000 0 035 000000 0 036 B000000 0 038 000000 0 042 A000000 0 042 B000000 0 042 C000000 0 042 D000000 0 042 E000000 0 042 F000000 0 042 G000000 0 042 H000000 0 043 000000 0 044 000000 0 045 000000 Y 046 000000 N 047 000000 Y 048 000000 0.500 048 A010000 0 048 A020000 0.000 048 B010000 0 048 B020000 0.000 048 C010000 0 048 C020000 0.000 048 D010000 0 PAGE 6 048 D020000 0.000 048 E010000 0 048 E020000 0.000 048 F010000 0 048 F020000 0.000 048 G010000 0 048 G020000 0.000 048 H010000 0 048 H020000 0.000 048 I010000 0 048 I020000 0.000 048 J010000 0 048 J020000 0.000 048 K010000 0 048 K020000 0.000 049 000000 N 050 000000 N 051 000000 N 052 000000 N 053 A000000 N 054 A000000 Y 054 B000000 Y 054 C000000 Y 054 D000000 N 054 E000000 N 054 F000000 N 054 G000000 Y 054 H000000 N 054 I000000 N 054 J000000 Y 054 K000000 N 054 L000000 Y 054 M000000 Y 054 N000000 N 054 O000000 Y 055 A000000 Y 055 B000000 N 056 000000 Y 057 000000 N 058 A000000 N 059 000000 Y 060 A000000 Y 060 B000000 Y 061 000000 0 062 A000000 Y 062 B000000 0.0 062 C000000 0.0 062 D000000 0.0 062 E000000 0.2 062 F000000 0.0 062 G000000 0.0 PAGE 7 062 H000000 0.0 062 I000000 0.0 062 J000000 0.0 062 K000000 0.0 062 L000000 0.0 062 M000000 0.0 062 N000000 0.0 062 O000000 103.8 062 P000000 0.0 062 Q000000 0.0 062 R000000 0.0 063 A000000 0 063 B000000 0.0 064 A000000 Y 064 B000000 Y 066 A000000 N 067 000000 N 068 A000000 N 068 B000000 N 069 000000 N 070 A010000 Y 070 A020000 N 070 B010000 N 070 B020000 N 070 C010000 Y 070 C020000 N 070 D010000 N 070 D020000 N 070 E010000 Y 070 E020000 N 070 F010000 N 070 F020000 N 070 G010000 Y 070 G020000 N 070 H010000 N 070 H020000 N 070 I010000 N 070 I020000 N 070 J010000 Y 070 J020000 Y 070 K010000 Y 070 K020000 N 070 L010000 Y 070 L020000 N 070 M010000 N 070 M020000 N 070 N010000 Y 070 N020000 N 070 O010000 Y 070 O020000 N 070 P010000 Y PAGE 8 070 P020000 Y 070 Q010000 N 070 Q020000 N 070 R010000 N 070 R020000 N 071 A000000 19312 071 B000000 17381 071 C000000 130443 071 D000000 13 072 A000000 12 072 B000000 9681 072 C000000 0 072 D000000 0 072 E000000 0 072 F000000 630 072 G000000 101 072 H000000 0 072 I000000 14 072 J000000 5 072 K000000 0 072 L000000 35 072 M000000 16 072 N000000 0 072 O000000 0 072 P000000 64 072 Q000000 0 072 R000000 49 072 S000000 15 072 T000000 0 072 U000000 0 072 V000000 0 072 W000000 56 072 X000000 985 072 Y000000 0 072 Z000000 8696 072AA000000 28 072BB000000 2443 072CC010000 19378 072CC020000 0 072DD010000 8241 072DD020000 0 072EE000000 0 073 A010000 0.4200 073 A020000 0.0000 073 B000000 0.0000 073 C000000 0.0000 074 A000000 463 074 B000000 0 074 C000000 200 074 D000000 138283 074 E000000 0 PAGE 9 074 F000000 0 074 G000000 0 074 H000000 0 074 I000000 0 074 J000000 27 074 K000000 0 074 L000000 2585 074 M000000 23 074 N000000 141581 074 O000000 391 074 P000000 65 074 Q000000 0 074 R010000 0 074 R020000 0 074 R030000 0 074 R040000 7924 074 S000000 0 074 T000000 133201 074 U010000 19620 074 U020000 0 074 V010000 6.79 074 V020000 0.00 074 W000000 0.0000 074 X000000 0 074 Y000000 0 075 A000000 0 075 B000000 125968 076 000000 6.51 077 A000000 Y 077 B000000 Y 077 C000000 Y 077 D000000 N 077 E000000 N 077 F000000 N 077 G000000 N 077 H000000 N 077 I000000 N 077 J000000 N 077 K000000 Y 077 L000000 N 077 M000000 N 077 N000000 N 077 O000000 N 077 P000000 N 077 Q010000 Y 077 Q020000 N 077 Q030000 N 078 000000 N 080 A000000 ICI MUTUAL INSURANCE COMPANY 080 B000000 AXIS INS., CONTINENTAL INS. AND WESTCHESTER F 080 C000000 75000 PAGE 10 081 A000000 Y 081 B000000 97 082 A000000 Y 082 B000000 0 083 A000000 N 083 B000000 0 084 A000000 N 084 B000000 0 085 A000000 Y 085 B000000 N 086 A010000 0 086 A020000 0 086 B010000 0 086 B020000 0 086 C010000 0 086 C020000 0 086 D010000 0 086 D020000 0 086 E010000 0 086 E020000 0 086 F010000 0 086 F020000 0 087 A010000 SHARES OF BENEFICIAL INTEREST 087 A020000 62621Q101 087 A030000 OIA 088 A000000 N 088 B000000 N 088 C000000 N 088 D000000 N SIGNATURE KELLI GALLEGOS TITLE ASSISTANT VP AND ASSISTANT TREASURER