Blackrock Insured Municipal Income Trust Sample Contracts

Blackrock Municipal Income Quality Trust – BlackRock Closed-End Funds Announce Date of 2011 Annual Meeting of Shareholders (February 4th, 2011)

New York, February 4, 2011— The BlackRock Closed-End Funds listed below (each a "Fund" and collectively, the "Funds") announced today that each of their 2011 annual meetings of shareholders will be held on July 28, 2011. Additional information regarding deadlines for shareholder proposals made pursuant to Rule 14a-8 under the Securities Exchange Act of 1934, as amended, and for shareholder proposals and director nominations made pursuant to the Funds' Bylaws, will be filed with the Securities and Exchange Commission by the Funds on a Current Report on Form 8-K.

Blackrock Insured Municipal Income Trust – Page ARTICLE I SHAREHOLDER MEETINGS Section 1. Chair 1 Section 2. Annual Meetings of Shareholders 1 Section 3. Special Meetings of Shareholders 1 Section 4. Place of Meetings 2 Section 5. Notice of Meetings 2 Section 6. Nature of Business at Annual Meetings of Shareholders 3 Section 7. Nomination of Directors 6 Section 8. Conduct of Meetings 11 Section 9. Postponements; Adjournments 12 Section 10. Record Date 12 Section 11. Voting 13 Section 12. Quorum 14 Section 13. Proxies 14 Section 14. Inspectors of Election 15 Section 15. Shareholder Action by Written Consent 15 Section 16. Records at Sha (October 29th, 2010)

These Bylaws are made and adopted pursuant to the Agreement and Declaration of Trust, dated as of August 19, 2002, as from time to time amended (hereinafter called the “Charter”), of BlackRock Insured Municipal Income Trust (the “Fund”).

Blackrock Insured Municipal Income Trust – BLACKROCK INSURED MUNICIPAL INCOME TRUST (October 7th, 2008)

preferred units of beneficial interest, preferred stock or preferred limited liability company interests which may be issued from time to time, as described herein. All references to Shares shall be deemed to be Shares of any or all series or classes as the context may require.