UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM N-Q QUARTERLY SCHEDULE OF PORTFOLIO HOLDINGS OF REGISTERED MANAGEMENT INVESTMENT COMPANY Investment Company Act file number 811-7080 Name of Fund: MuniYield Michigan Insured Fund, Inc. Fund Address: P.O. Box 9011 Princeton, NJ 08543-9011 Name and address of agent for service: Terry K. Glenn, President, MuniYield Michigan Insured Fund, Inc., 800 Scudders Mill Road, Plainsboro, NJ, 08536. Mailing address: P.O. Box 9011, Princeton, NJ, 08543-9011 Registrant's telephone number, including area code: (609) 282-2800 Date of fiscal year end: 10/31/04 Date of reporting period: 05/01/04 - 07/31/04 Item 1 - Schedule of Investments MuniYield Michigan Insured Fund, Inc. Schedule of Investments as of July 31, 2004 (in Thousands) S&P Moody's Face Ratings Ratings Amount Municipal Bonds Value Michigan - 141.1% Adrian, Michigan, City School District, GO(d): AAA Aaa $ 2,000 5% due 5/01/2029 $ 2,004 AAA Aaa 1,600 5% due 5/01/2034 1,597 AAA Aaa 1,000 Allegan, Michigan, Public School District, GO, 5.75% due 5/01/2030(d) 1,073 Belding, Michigan, Area Schools, GO, Refunding(c): AAA Aaa 785 6.05% due 5/01/2006(e) 848 AAA Aaa 215 6.05% due 5/01/2021 229 AAA Aaa 5,000 Birmingham, Michigan, City School District, School Building and Site, GO, 5% due 11/01/2033(d) 4,992 AAA Aaa 1,000 Central Montcalm, Michigan, Public Schools, GO, 5.90% due 5/01/2019(b) 1,107 AAA Aaa 1,000 Comstock Park, Michigan, Public Schools, GO, 5.75% due 5/01/2029(c) 1,073 Delta County, Michigan, Economic Development Corporation, Environmental Improvement Revenue Refunding Bonds (Mead Westvaco-Escanaba): BBB Baa2 1,500 AMT, Series B, 6.45% due 4/15/2023 1,550 BBB Baa2 2,000 Series A, 6.25% due 4/15/2027 2,076 Detroit, Michigan, City School District, GO, Series A: AAA Aaa 1,000 5.50% due 5/01/2018(d) 1,099 AAA Aaa 2,300 (School Building and Site Improvement), 5.375% due 5/01/2024(c) 2,424 Detroit, Michigan, GO(b): AAA Aaa 1,400 5.50% due 4/01/2018 1,527 AAA Aaa 1,325 5.50% due 4/01/2020 1,435 AAA Aaa 2,705 Series B, 6% due 4/01/2015 3,057 AAA Aaa 1,545 Detroit, Michigan, Sewer Disposal Revenue Refunding Bonds, Senior Lien, Series C, 5.25% due 7/01/2022(d) 1,678 Detroit, Michigan, Water Supply System Revenue Bonds: AAA NR* 4,375 DRIVERS, Series 200, 10.14% due 7/01/2011(c)(e)(g) 5,670 AAA Aaa 1,250 Senior Lien, Series A, 5.875% due 1/01/2010(c)(e) 1,427 AAA Aaa 6,900 Senior Lien, Series A, 5% due 7/01/2034(b) 6,831 AAA Aaa 15,490 Series B, 5.25% due 7/01/2032(b) 15,832 AAA Aaa 3,500 Series B, 5% due 7/01/2034(b) 3,465 Portfolio Abbreviations To simplify the listings of MuniYield Michigan Insured Fund, Inc.'s portfolio holdings in the Schedule of Investments, we have abbreviated the names of many of the securities according to the list below. AMT Alternative Minimum Tax (subject to) COP Certificates of Participation DRIVERS Derivative Inverse Tax-Exempt Receipts GO General Obligation Bonds HDA Housing Development Authority PCR Pollution Control Revenue Bonds RIB Residual Interest Bonds MuniYield Michigan Insured Fund, Inc. Schedule of Investments as of July 31, 2004 (concluded) (in Thousands) S&P Moody's Face Ratings Ratings Amount Municipal Bonds Value Michigan (concluded) AAA Aaa $ 1,415 Detroit, Michigan, Water Supply System Revenue Refunding Bonds, 6.25% due 7/01/2012(c)(h) $ 1,422 BBB Baa2 3,900 Dickinson County, Michigan, Economic Development Corporation, Environmental Improvement Revenue Refunding Bonds (International Paper Company Project), Series A, 5.75% due 6/01/2016 4,055 BBB Baa2 2,500 Dickinson County, Michigan, Economic Development Corporation, PCR, Refunding (Champion International Corporation Project), 5.85% due 10/01/2018 2,551 A NR* 3,100 Dickinson County, Michigan, Healthcare System, Hospital Revenue Refunding Bonds, 5.80% due 11/01/2024(i) 3,171 AAA Aaa 1,610 East Grand Rapids, Michigan, Public School District, GO, 5.75% due 5/01/2009(d)(e) 1,807 Eastern Michigan University Revenue Bonds, Series B(c): AAA Aaa 1,500 5.60% due 6/01/2025 1,601 AAA Aaa 1,310 5.625% due 6/01/2030 1,387 AAA Aaa 1,025 Eastern Michigan University Revenue Refunding Bonds, 6% due 6/01/2020(a) 1,158 Eaton Rapids, Michigan, Public Schools, School Building and Site, GO(d): AAA Aaa 1,325 5.25% due 5/01/2020 1,420 AAA Aaa 1,675 5.25% due 5/01/2021 1,783 AAA Aaa 1,700 5% due 5/01/2026 1,713 AAA Aaa 3,600 5% due 5/01/2029 3,608 A NR* 615 Flint, Michigan, Hospital Building Authority, Revenue Refunding Bonds (Hurley Medical Center), Series A, 5.375% due 7/01/2020(i) 618 AAA Aaa 1,800 Fowlerville, Michigan, Community Schools, School District GO, 5% due 5/01/2030(c) 1,803 AAA Aaa 1,000 Frankenmuth, Michigan, School District, GO, 5.75% due 5/01/2020(c) 1,102 AAA Aaa 3,650 Gibraltar, Michigan, School District, School Building and Site, GO, 5% due 5/01/2028(c) 3,665 AAA Aaa 1,100 Grand Blanc, Michigan, Community Schools, GO, 5.625% due 5/01/2020(c) 1,212 Grand Rapids, Michigan, Building Authority Revenue Bonds, Series A(a): AAA Aaa 1,100 5.50% due 10/01/2019 1,206 AAA Aaa 1,500 5.50% due 10/01/2020 1,635 AAA Aaa 2,070 Grand Valley, Michigan, State University Revenue Bonds, 5.50% due 2/01/2018(c) 2,316 AAA NR* 8,425 Greater Detroit, Michigan, Resource Recovery Authority Revenue Bonds, DRIVERS, Series 167, 11.121% due 12/13/2008(a)(g) 10,603 AAA Aaa 9,325 Hartland, Michigan, Consolidated School District, GO, 6% due 5/01/2010 (c)(e) 10,683 AA+ Aa1 1,475 Haslett, Michigan, Public School District, Building and Site, GO, 5.625% due 5/01/2020 1,622 AAA Aaa 3,990 Hudsonville, Michigan, Public Schools, School Building and Site, GO, 5% due 5/01/2029(d) 3,999 AAA Aaa 1,575 Jenison, Michigan, Public Schools, Building and Site, GO, 5.50% due 5/01/2019(c) 1,724 AAA Aaa 3,305 Jonesville, Michigan, Community Schools, GO, 5.75% due 5/01/2029(c) 3,547 NR* Aaa 6,850 Kalamazoo, Michigan, Hospital Finance Authority, Hospital Facility Revenue Refunding Bonds (Bronson Methodist Hospital), 5.50% due 5/15/2028(b) 6,996 AAA Aaa 4,000 Kent, Michigan, Hospital Finance Authority, Hospital Revenue Refunding Bonds (Butterworth Hospital), Series A, 7.25% due 1/15/2013(b) 4,780 Kent, Michigan, Hospital Finance Authority Revenue Bonds (Spectrum Health), Series A(b): AA Aa3 1,000 5.50% due 1/15/2031 1,018 AAA Aaa 3,000 5.50% due 1/15/2031 3,103 AAA Aaa 1,510 Lansing, Michigan, Building Authority, GO, Series A, 5.375% due 6/01/2023(b) 1,603 AAA Aaa 5,235 Lincoln Park, Michigan, School District, GO, 7% due 5/01/2006(c)(e) 5,743 AAA Aaa 4,775 Livonia, Michigan, Public School District, GO (Building and Site), 5.75% due 5/01/2010(c)(e) 5,408 BBB NR* 2,250 Michigan Higher Education Facilities Authority, Limited Obligation Revenue Refunding Bonds (Hope College), Series A, 5.90% due 4/01/2032 2,293 Michigan Higher Education Facilities Authority, Revenue Refunding Bonds (College for Creative Studies): NR* Baa2 1,235 5.85% due 12/01/2022 1,248 NR* Baa2 1,145 5.90% due 12/01/2027 1,147 AAA Aaa 2,500 Michigan Higher Education Student Loan Authority, Student Loan Revenue Bonds, AMT, Series XVII-B, 5.40% due 6/01/2018(a) 2,581 AAA NR* 1,065 Michigan Municipal Bond Authority Revenue Bonds (Local Government Loan Program), Group A, 5.50% due 11/01/2020(a) 1,162 Michigan Municipal Bond Authority, Revenue Refunding Bonds (Local Government Loan Program), Series A: AAA Aaa 150 6.50% due 11/01/2012(b) 152 AAA Aaa 1,000 6% due 12/01/2013(c) 1,035 AAA Aaa 7,000 6.125% due 12/01/2018(c) 7,237 AA+ Aaa 7,000 Michigan State Building Authority Revenue Bonds, GO, RIB, Series 481, 9.643% due 4/15/2009(b)(g) 8,620 Michigan State Building Authority Revenue Refunding Bonds: AAA Aaa 2,500 (Facilities Program), Series I, 5.50% due 10/15/2018(b) 2,746 AAA Aaa 3,000 (Facilities Program), Series II, 5% due 10/15/2029 3,006 NR* Aaa 11,140 RIB, Series 517X, 9.64% due 10/15/2010(d)(g) 13,837 Michigan State COP(a): AAA Aaa 3,000 5.40% ** due 6/01/2022 1,199 AAA Aaa 3,000 5.50% due 6/01/2027 3,136 AAA Aaa 2,665 Michigan State HDA, Rental Housing Revenue Bonds, AMT, Series A, 5.30% due 10/01/2037(b) 2,679 AA+ NR* 2,690 Michigan State HDA, Revenue Refunding Bonds, Series C, 5.90% due 12/01/2015(f) 2,806 AAA Aaa 2,530 Michigan State Hospital Finance Authority, Hospital Revenue Bonds (Mid-Michigan Obligation Group), Series A, 5.50% due 4/15/2018(a) 2,708 Michigan State Hospital Finance Authority, Hospital Revenue Refunding Bonds: A+ A2 2,200 (Crittenton Hospital), Series A, 5.625% due 3/01/2027 2,240 A A1 2,000 (Sparrow Obligation Group), 5.625% due 11/15/2031 2,019 Michigan State Hospital Finance Authority Revenue Refunding Bonds: AAA Aaa 2,715 (Ascension Health Credit), Series A, 5.75% due 11/15/2009(b)(e) 3,082 AAA Aaa 12,000 (Ascension Health Credit), Series A, 6.125% due 11/15/2009(b)(e) 13,838 AAA Aaa 2,500 (Ascension Health Credit), Series A, 6.25% due 11/15/2009(b)(e) 2,898 AAA Aaa 4,805 (Mercy Health Services), Series T, 6.50% due 8/15/2013(b) 5,359 AAA Aaa 2,000 (Mercy Health Services), Series X, 6% due 8/15/2014(b) 2,249 AAA Aaa 2,200 (Mercy Health Services), Series X, 5.75% due 8/15/2019(b) 2,401 AAA Aaa 4,930 (Mercy Mount Clemens), Series A, 6% due 5/15/2014(b) 5,526 AAA Aaa 3,000 (Saint John Hospital), Series A, 6% due 5/15/2013(a)(h) 3,151 AAA Aaa 6,400 (Trinity Health), Series A, 6% due 12/01/2027(a) 6,959 AA- Aa3 1,000 (Trinity Health Credit), Series C, 5.375% due 12/01/2023 1,029 AA- Aa3 5,255 (Trinity Health Credit), Series C, 5.375% due 12/01/2030 5,306 BBB- Baa1 5,000 Michigan State Strategic Fund, Limited Obligation Revenue Bonds (Ford Motor Company Project), AMT, Series A, 6.55% due 10/01/2022 5,014 Michigan State Strategic Fund, Limited Obligation Revenue Refunding Bonds: AAA Aaa 7,250 (Detroit Edison Company), AMT, Series A, 5.55% due 9/01/2029(b) 7,444 AAA Aaa 6,000 (Detroit Edison Company Fund - Pollution), Series AA, 6.95% due 5/01/2001(c) 7,175 A- A3 3,300 (Detroit Edison Pollution Control), Series C, 5.45% due 9/01/2029 3,331 A- A3 2,175 (Dow Chemical Company Project), AMT, 5.50% due 12/01/2028 2,260 NR* Aaa 5,750 RIB, Series 382, 11.39% due 9/01/2025(b)(g) 6,485 BBB Baa1 2,500 Michigan State Strategic Fund, PCR, Refunding (General Motors Corp.), 6.20% due 9/01/2020 2,654 AAA Aaa 1,000 Michigan State Trunk Line Revenue Refunding Bonds, 5.25% due 10/01/2021(d) 1,056 AAA Aaa 15,000 Monroe County, Michigan, Economic Development Corp., Limited Obligation Revenue Refunding Bonds (Detroit Edison Co. Project), Series AA, 6.95% due 9/01/2022(c) 19,304 AAA Aaa 1,000 Montrose Township, Michigan, School District, GO, 6.20% due 5/01/2017(b) 1,184 NR* Aaa 1,830 Muskegon Heights, Michigan, Water System Revenue Bonds, Series A, 5.625% due 11/01/2025(b) 1,959 AAA Aaa 235 Northview, Michigan, Public School District, GO, Refunding, 5.80% due 5/01/2021(b) 249 AAA Aaa 1,100 Norway Vulcan, Michigan, Area Schools, GO, 5.90% due 5/01/2025(c) 1,206 AA+ Aaa 2,425 Oxford, Michigan, Area Community School District, GO, 5.50% due 5/01/2018(d) 2,666 AAA Aaa 1,370 Pennfield, Michigan, School District, School Building and Site, GO, 5% due 5/01/2029(c) 1,373 AAA Aaa 1,000 Plainwell, Michigan, Community Schools, School District, School Building and Site, GO, 5.50% due 5/01/2020(d) 1,088 A NR* 700 Pontiac, Michigan, Tax Increment Finance Authority, Tax Increment Revenue Refunding Bonds (Development Area 2), 5.625% due 6/01/2022(i) 714 AAA Aaa 1,425 Reed, Michigan, City Public Schools, School Building and Site, GO, 5% due 5/01/2026(d) 1,436 AA+ Aa1 1,800 Rochester, Michigan, Community School District, GO, Series II, 5.50% due 5/01/2015(c) 1,984 AAA Aaa 2,500 Saginaw, Michigan, Hospital Finance Authority Revenue Refunding Bonds (Covenant Medical Center), Series E, 5.625% due 7/01/2013(b) 2,759 Saginaw Valley State University, Michigan, General Revenue Refunding Bonds(c): NR* Aaa 2,100 5% due 7/01/2024 2,138 NR* Aaa 1,445 5% due 7/01/2034 1,442 NR* Aaa 8,900 Saint Clair County, Michigan, Economic Revenue Refunding Bonds (Detroit Edison Company), RIB, Series 282, 11.42% due 8/01/2024(a)(g) 11,309 AAA Aaa 1,300 Southfield, Michigan, Library Building Authority, GO, 5.50% due 5/01/2018(b) 1,423 Southfield, Michigan, Public Schools, School Building and Site, GO, Series B(d): AAA Aaa 2,900 5.25% due 5/01/2027 3,002 AAA Aaa 3,500 5% due 5/01/2029 3,508 AAA Aaa 1,325 Sparta, Michigan, Area Schools, School Building and Site, GO, 5% due 5/01/2030(c) 1,325 Sturgis, Michigan, Public School District, School Building and Site, GO: AA+ Aa1 1,900 5.50% due 5/01/2021 2,061 AA+ Aa1 2,545 5.625% due 5/01/2030 2,694 AAA Aaa 1,000 Three Rivers, Michigan, Community Schools, GO, 6% due 5/01/2006(b)(e) 1,080 AAA Aaa 1,100 Waverly, Michigan, Community School, GO, 5.50% due 5/01/2021(c) 1,193 AAA Aaa 10,660 Wayne Charter County, Michigan, Airport Revenue Bonds (Detroit Metropolitan Wayne County), AMT, Series A, 5.375% due 12/01/2015(b) 11,344 AAA Aaa 1,750 Wayne Charter County, Michigan, Detroit Metropolitan Airport, GO, Airport Hotel, Series A, 5% due 12/01/2030(b) 1,752 West Bloomfield, Michigan, School District, GO Refunding(c): AAA Aaa 1,710 5.50% due 5/01/2017 1,888 AAA Aaa 1,225 5.50% due 5/01/2018 1,347 AAA Aaa 2,405 West Branch-Rose City, Michigan, Area School District, GO, 5.50% due 5/01/2024(c) 2,558 AAA Aaa 1,600 Zeeland, Michigan, Public Schools, School Building and Site, GO, 5% due 5/01/2029(b) 1,604 Puerto Rico - 4.6% AAA Aaa 1,270 Puerto Rico Electric Power Authority, Power Revenue Bonds, Trust Receipts, Class R, Series 16 HH, 10.07% due 7/01/2013(d)(g) 1,632 AAA Aaa 3,790 Puerto Rico Municipal Finance Agency Revenue Bonds, Series A, 5% due 8/01/2027(d) 3,837 Puerto Rico Public Finance Corporation, Commonwealth Appropriation Revenue Bonds(e): AAA Aaa 1,000 Series A, 5.375% due 8/01/2011(b) 1,122 BBB+ Baa2 2,900 Series E, 5.75% due 2/01/2007 3,146 BBB+ Baa2 1,000 Series E, 5.70% due 2/01/2010 1,129 AAA Aaa 2,150 University of Puerto Rico, University Revenue Refunding Bonds, Series O, 5.375% due 6/01/2030(b) 2,212 Total Municipal Bonds (Cost - $382,996) - 145.8% 410,792 Shares Held Short-Term Securities 11,077 CMA Michigan Municipal Money Fund(j) 11,077 Total Short-Term Securities (Cost - $11,077) - 3.9% 11,077 Total Investments (Cost - $394,073***) - 149.7% 421,869 Other Assets Less Liabilities- 0.0% 22 Preferred Stock, at Redemption Value - (49.7%) (140,009) ---------- Net Assets Applicable to Common Stock - 100.0% $ 281,882 ========== (a) AMBAC Insured. (b) MBIA Insured. (c) FGIC Insured. (d) FSA Insured. (e) Prerefunded. (f) FHA Insured. (g) The interest rate is subject to change periodically and inversely based upon prevailing market rates. The interest rate shown is the rate in effect at July 31, 2004. (h) Escrowed to maturity. (i) ACA Insured. (j) Investments in companies considered to be an affiliate of the Fund (such companies are defined as "Affiliated Companies" in Section 2(a)(3) of the Investment Company Act of 1940) were as follows: (in Thousands) Net Dividend Affiliate Activity Income CMA Michigan Municipal Money Fund 241 $ 41 * Not Rated. ** Represents a zero coupon bond; the interest rate shown reflects the effective yield at the time of purchase by the Fund. ***The cost and unrealized appreciation/depreciation of investments as of July 31, 2004, as computed for federal income tax purposes were as follows: (in Thousands) Aggregate cost $ 394,073 ============== Gross unrealized appreciation $ 27,895 Gross unrealized depreciation (99) -------------- Net unrealized appreciation $ 27,796 ============== Forward interest rate swaps outstanding as of July 31, 2004 were as follows: (in Thousands) Notional Unrealized Amount Depreciation Receive a variable rate equal to 7-Day Bond Market Association Municipal Swap Index Rate and pay a fixed rate equal to 4.229% Broker, J.P. Morgan Chase Bank Expires August 2014 $ 10,000 $ (402) Receive a variable rate equal to 7-Day Bond Market Association Municipal Swap Index Rate and pay a fixed rate equal to 4.081% Broker, J.P. Morgan Chase Bank Expires August 2014 $ 10,100 (276) Receive a variable rate equal to 7-Day Bond Market Association Municipal Swap Index Rate and pay a fixed rate equal to 3.885% Broker, J.P. Morgan Chase Bank Expires October 2014 $ 21,500 (138) -------- Total $ (816) ======== Item 2 - Controls and Procedures 2(a) - The registrant's certifying officers have reasonably designed such disclosure controls and procedures to ensure material information relating to the registrant is made known to us by others particularly during the period in which this report is being prepared. The registrant's certifying officers have determined that the registrant's disclosure controls and procedures are effective based on our evaluation of these controls and procedures as of a date within 90 days prior to the filing date of this report. 2(b) - There were no changes in the registrant's internal control over financial reporting (as defined in Rule 30a-3(d) under the Act (17 CFR 270.30a-3(d)) that occurred during the last fiscal quarter of the period covered by this report that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting. Item 3 - Exhibits Certifications - Attached hereto Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. MuniYield Michigan Insured Fund, Inc. By: _/s/ Terry K. Glenn________ Terry K. Glenn, President of MuniYield Michigan Insured Fund, Inc. Date: September 17, 2004 Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated. By: _/s/ Terry K. Glenn________ Terry K. Glenn, President of MuniYield Michigan Insured Fund, Inc. Date: September 17, 2004 By: _/s/ Donald C. Burke________ Donald C. Burke, Chief Financial Officer of MuniYield Michigan Insured Fund, Inc. Date: September 17, 2004