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Proc-Type: 2001,MIC-CLEAR
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<SEC-DOCUMENT>0001287695-08-000588.txt : 20080929
<SEC-HEADER>0001287695-08-000588.hdr.sgml : 20080929
<ACCEPTANCE-DATETIME>20080929122903
ACCESSION NUMBER:		0001287695-08-000588
CONFORMED SUBMISSION TYPE:	NSAR-B
PUBLIC DOCUMENT COUNT:		3
CONFORMED PERIOD OF REPORT:	20080731
FILED AS OF DATE:		20080929
DATE AS OF CHANGE:		20080929
EFFECTIVENESS DATE:		20080929

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			BLACKROCK MUNIYIELD MICHIGAN INSURED FUND, INC.
		CENTRAL INDEX KEY:			0000890393
		IRS NUMBER:				223196060
		STATE OF INCORPORATION:			NJ
		FISCAL YEAR END:			0930

	FILING VALUES:
		FORM TYPE:		NSAR-B
		SEC ACT:		1940 Act
		SEC FILE NUMBER:	811-07080
		FILM NUMBER:		081093156

	BUSINESS ADDRESS:	
		STREET 1:		800 SCUDDERS MILL RD
		CITY:			PLAINSBORO
		STATE:			NJ
		ZIP:			08536
		BUSINESS PHONE:		6092825284

	MAIL ADDRESS:	
		STREET 1:		800 SCUDDERS MILL RD
		CITY:			PLAINSBORO
		STATE:			NJ
		ZIP:			08536

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MUNIYIELD MICHIGAN INSURED FUND INC
		DATE OF NAME CHANGE:	20020620

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MUNIYIELD MICHIGAN INSURED FUND II INC
		DATE OF NAME CHANGE:	20020620

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MUNIYIELD MICHIGAN INSURED FUND INC
		DATE OF NAME CHANGE:	19920929
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SIGNATURE   DONALD C. BURKE
TITLE       PRESIDENT

</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.77B ACCT LTTR
<SEQUENCE>2
<FILENAME>mymiin77b.htm
<TEXT>
<!doctype html public "-//IETF//DTD HTML//EN">
<HTML>
<HEAD>
<TITLE>005 &nbsp;&nbsp;&nbsp;&nbsp;EXAMPLE A-1 &#8212; REPORT ON INTERNAL CONTROL &#8212; N-SAR LETTER ON A STAND ALONE FUND &#8212; NO MATERIAL WEAKNESSES</TITLE>
<META NAME="author" CONTENT="Daryl White (Open)">
<META NAME="date" CONTENT="09/29/2008">
</HEAD>
<BODY>
<P style="margin-left:0pt; margin-top:4.6pt; margin-bottom:4.6pt; padding:0pt; text-indent:0pt; line-height:11pt; font-size:11pt; color:#000000">REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM</P>
<P style="margin-left:0pt; margin-top:4.6pt; margin-bottom:4.6pt; padding:0pt; text-indent:0pt; line-height:11pt; font-size:11pt; color:#000000">To the Shareholders and Board of Directors of <BR>
BlackRock MuniYield Michigan Insured Fund, Inc.:</P>
<P style="margin-left:0pt; margin-top:4.6pt; margin-bottom:4.6pt; padding:0pt; text-indent:0pt; line-height:11pt; font-size:11pt; color:#000000">In planning and performing our audit of the financial statements of BlackRock MuniYield Michigan Insured Fund, Inc. &nbsp;(the &quot;Fund&quot;) as of and for the period November 1, 2007 to July 31, 2008, in accordance with the standards of the Public Company Accounting Oversight Board (United States), we considered the Fund&#146;s internal control over financial reporting, including controls over safeguarding securities, as a basis for designing our auditing procedures for the purpose of expressing our opinion on the financial statements and to comply with the requirements of Form N-SAR, but not for the purpose of expressing an opinion on the effectiveness of the Fund's internal control over financial reporting.&nbsp; Accordingly, we express no such opinion.</P>
<P style="margin-left:0pt; margin-top:4.6pt; margin-bottom:4.6pt; padding:0pt; text-indent:0pt; line-height:11pt; font-size:11pt; color:#000000">The management of the Fund is responsible for establishing and maintaining effective internal control over financial reporting.&nbsp; In fulfilling this responsibility, estimates and judgments by management are required to assess the expected benefits and related costs of controls.&nbsp; A company's internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles.&nbsp; A company's internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that
 transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of a company's assets that could have a material effect on the financial statements.</P>
<P style="margin-left:0pt; margin-top:4.6pt; margin-bottom:4.6pt; padding:0pt; text-indent:0pt; line-height:11pt; font-size:11pt; color:#000000">Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements.&nbsp; Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions or that the degree of compliance with the policies or procedures may deteriorate.</P>
<P style="margin-left:0pt; margin-top:4.6pt; margin-bottom:4.6pt; padding:0pt; text-indent:0pt; line-height:11pt; font-size:11pt; color:#000000">A deficiency in internal control over financial reporting exists when the design or operation of a control does not allow management or employees, in the normal course of performing their assigned functions, to prevent or detect misstatements on a timely basis.&nbsp; A material weakness is a deficiency, or a combination of deficiencies, in internal control over financial reporting, such that there is a reasonable possibility that a material misstatement of the company's annual or interim financial statements will not be prevented or detected on a timely basis.</P>
<P style="margin-left:0pt; margin-top:4.6pt; margin-bottom:4.6pt; padding:0pt; text-indent:0pt; line-height:11pt; font-size:11pt; color:#000000">Our consideration of the Fund's internal control over financial reporting was for the limited purpose described in the first paragraph and would not necessarily disclose all deficiencies in internal control that might be material weaknesses under standards established by the Public Company Accounting Oversight Board (United States).&nbsp; However, we noted no deficiencies in the Fund's internal control over financial reporting and its operation, including controls for safeguarding securities, that we consider to be a material weakness, as defined above, as of July 31, 2008.</P>
<P style="margin-left:0pt; margin-top:4.6pt; margin-bottom:4.6pt; padding:0pt; text-indent:0pt; line-height:11pt; font-size:11pt; color:#000000">This report is intended solely for the information and use of management and the Board of Directors of BlackRock MuniYield Michigan Insured Fund, Inc. and the Securities and Exchange Commission and is not intended to be and should not be used by anyone other than these specified parties.</P>
<P style="margin-left:0pt; margin-top:4.6pt; margin-bottom:0pt; padding:0pt; text-indent:0pt; line-height:11pt; font-size:11pt; color:#000000"><I>DELOITTE &amp; TOUCHE LLP</I></P>
<P style="margin-left:0pt; margin-top:0pt; margin-bottom:0pt; padding:0pt; text-indent:0pt; font-size:11pt; color:#000000"><BR></P>
<P style="margin-left:0pt; margin-top:0pt; margin-bottom:0pt; padding:0pt; text-indent:0pt; font-size:11pt; color:#000000"><BR></P>
<P style="margin-left:0pt; margin-top:0pt; margin-bottom:0pt; padding:0pt; text-indent:0pt; font-size:11pt; color:#000000"><BR></P>
<P style="margin-left:0pt; margin-top:0pt; margin-bottom:0pt; padding:0pt; text-indent:0pt; line-height:11pt; font-size:11pt; color:#000000">Princeton, New Jersey</P>
<P style="margin-left:0pt; margin-top:0pt; margin-bottom:0pt; padding:0pt; text-indent:0pt; line-height:11pt; font-size:11pt; color:#000000">September 25, 2008</P>
<P style="margin-left:0pt; margin-top:0pt; margin-bottom:0pt; padding:0pt; text-indent:0pt; font-size:11pt; color:#000000"><BR></P>
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<DOCUMENT>
<TYPE>EX-99.77D POLICIES
<SEQUENCE>3
<FILENAME>mymiin77d.htm
<TEXT>
<!doctype html public "-//IETF//DTD HTML//EN">
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<HEAD>

<META NAME="author" CONTENT="Daniel Phillips">
<META NAME="date" CONTENT="09/25/2008">
</HEAD>
<BODY>
<P style="margin-left:0pt; margin-top:0pt; margin-bottom:0pt; padding:0pt; text-indent:0pt; line-height:12pt; font-size:12pt; color:#000000"><U>BlackRock MuniYield Michigan Insured Fund, Inc.</U></P>
<P style="margin-left:0pt; margin-top:0pt; margin-bottom:0pt; padding:0pt; text-indent:0pt; font-size:12pt; color:#000000"><BR></P>
<P style="margin-left:0pt; margin-top:0pt; margin-bottom:0pt; padding:0pt; text-indent:0pt; line-height:12pt; font-size:12pt; color:#000000">77D(g)</P>
<P style="margin-left:0pt; margin-top:0pt; margin-bottom:0pt; padding:0pt; text-indent:0pt; line-height:12pt; font-size:12pt; color:#000000">Policies with respect to security investments</P>
<P style="margin-left:0pt; margin-top:0pt; margin-bottom:0pt; padding:0pt; text-indent:0pt; font-size:12pt; color:#000000"><BR></P>
<P style="margin-left:0pt; margin-top:0pt; margin-bottom:0pt; padding:0pt; text-indent:0pt; line-height:12pt; font-size:12pt; color:#000000">Effective September 12, 2008, the Board of Directors of BlackRock MuniYield Michigan Insured Fund, Inc. (the &#147;Fund&#148;) approved the following change in the Fund&#146;s non-fundamental investment policies:</P>
<P style="margin-left:0pt; margin-top:0pt; margin-bottom:0pt; padding:0pt; text-indent:0pt; font-size:12pt; color:#000000"><BR></P>
<P style="margin-left:0pt; margin-top:0pt; margin-bottom:0pt; padding:0pt; text-indent:0pt; line-height:12pt; font-size:12pt; color:#000000"><U>Old Investment Guideline</U></P>
<P style="margin-left:0pt; margin-top:0pt; margin-bottom:0pt; padding:0pt; text-indent:0pt; line-height:12pt; font-size:12pt; color:#000000">Under normal market conditions, the Fund is required to invest at least 80% of its assets in municipal bonds insured by insurers with claims-paying ability of AAA at the time of investment.</P>
<P style="margin-left:0pt; margin-top:0pt; margin-bottom:0pt; padding:0pt; text-indent:0pt; font-size:12pt; color:#000000"><BR></P>
<P style="margin-left:0pt; margin-top:0pt; margin-bottom:0pt; padding:0pt; text-indent:0pt; line-height:12pt; font-size:12pt; color:#000000"><U>New Investment Guideline</U></P>
<P style="margin-left:0pt; margin-top:0pt; margin-bottom:0pt; padding:0pt; text-indent:0pt; line-height:12pt; font-size:12pt; color:#000000">Under normal market conditions, the Fund is required to invest at least 80% of its assets in municipal bonds insured by insurance providers or other entities with claims-paying abilities rated at least investment grade at the time of investment.</P>
<P style="margin-left:0pt; margin-top:0pt; margin-bottom:0pt; padding:0pt; text-indent:0pt; font-size:12pt; color:#000000"><BR></P>
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