Filing by Voyageur Tax-Free Funds Pursuant to Rule 425 under the Securities Act of 1933, Subject Company - Delaware Tax-Free Minnesota Insured Fund, a series of Voyageur Insured Funds, Commission File No. 811-04973 [Delaware Investments Logo] August 28, 2006 Dear Shareholder: I am writing to tell you about a significant change that has been proposed for Delaware Tax-Free Minnesota Insured Fund. The Board of Trustees of Delaware Investments(R)Family of Funds has approved a proposal to reorganize Delaware Tax-Free Minnesota Insured Fund with and into Delaware Tax-Free Minnesota Fund, subject to shareholder approval. The Board of Trustees responsible for Delaware Tax-Free Minnesota Fund has also approved the reorganization. It is anticipated that you will be asked to approve the proposed merger at a shareholder meeting to be held in late November 2006. Prior to that time, you will receive a combined prospectus / proxy statement. The statement will explain your voting rights and provide a discussion of the merger. Any solicitation of proxies by Delaware Tax-Free Minnesota Insured Fund in connection with this shareholder meeting will be made only pursuant to separate proxy materials filed under the federal securities laws. It is anticipated that these proxy materials will be distributed to the Fund's shareholders in October 2006. There can be no assurance that the shareholders of the Fund will vote in favor of the proposed reorganization. We urge you to read the proxy materials carefully when you receive them, and we remind you that your vote is important. The investment objectives of Delaware Tax-Free Minnesota Insured Fund and Delaware Tax-Free Minnesota Fund are the same: to seek high current income exempt from federal income taxes (including the federal alternative minimum tax) and from Minnesota state personal income taxes, consistent with preservation of capital. Each Fund seeks to achieve its investment objectives by investing at least 80% of its net assets in municipal securities. However, Delaware Tax-Free Minnesota Insured Fund is required to invest at least 80% of its assets in insured securities. Therefore, the most significant difference between the Funds is that Delaware Tax-Free Minnesota Fund is not required to make a specific allocation to insured securities. The proposed reorganized fund may potentially benefit by the growth in assets realized by combining the Funds. A larger fund can potentially realize cost savings due to economies of scale from the spreading of fixed costs over a larger asset base, and by reaching, or utilizing to a greater extent, breakpoints in investment management fees. Both Funds are currently managed by the same team of portfolio managers, and no management changes are expected as part of the merger. Any account options that you may have elected for your current account(s) in Delaware Tax-Free Minnesota Insured Fund (such as automatic investing plans and systematic withdrawal plans) will be carried over to Delaware Tax-Free Minnesota Fund. If you do not wish to participate in the reorganization, you may exchange your shares of Delaware Minnesota Tax-Free Fund for shares of any other Delaware Investments mutual fund.* If you do not wish to exchange into another Delaware Investments mutual fund, you may liquidate your shares in full. Please keep in mind that you may be subject to applicable taxes. Please note that liquidations will be subject to any applicable contingent deferred sales charges (CDSCs); such fees will not be waived as part of the reorganization. If you have any questions about these changes or how they will affect your Delaware Investments account(s), I encourage you to contact your financial advisor or call our shareholder service center at 800-523-1918. Our service representatives are available to help you from 8:00 a.m. to 7:00 p.m. EST, Monday through Friday. In connection with the proposed Reorganization, Delaware Tax-Free Minnesota Insured Fund and Voyageur Tax-Free Funds, on behalf of the Delaware Tax-Free Minnesota Fund, intend to file relevant materials with the U.S. Securities and Exchange Commission (the "SEC"), including a Form N-14 combined proxy statement for the Fund and a registration statement for Delaware Tax-Free Minnesota Fund that will contain a prospectus. Because those documents will contain important information, the Fund's shareholders are urged to read them carefully when they become available. When filed with the SEC, those documents will be available free of charge at the SEC's website, www.sec.gov. The Fund's shareholders will also be able to obtain copies of these documents and other transaction-related documents free of charge, when available, by calling Delaware Investments toll-free at 800-523-1918. The foregoing is not an offer to sell, nor a solicitation of an offer to buy, shares of any fund, nor is it a solicitation of any proxy. We thank you for your confidence in Delaware Investments, and we look forward to continuing to play an important part in your financial plan. Sincerely, /s/Patrick P. Coyne Patrick P. Coyne Chairman Delaware Investments(R)Family of Funds Delaware Investments is the marketing name of Delaware Management Holdings, Inc. and its subsidiaries. Retail mutual fund advisory services are provided by Delaware Management Company, a series of Delaware Management Business Trust (DMBT). DMBT is a registered investment advisor and a subsidiary of Delaware Management Holdings, Inc. * When exchanging Class B and Class C shares of one fund for the same class of shares in other funds, your new shares will be subject to the same contingent deferred sales charge as the shares you originally purchased. The holding period for the contingent deferred sales charge will also remain the same, with the amount of time you held your original shares being credited toward the holding period of your new shares. You don't pay sales charges on shares that you acquired through the reinvestment of dividends. You may have to pay taxes on your exchange. When you exchange shares, you are purchasing shares in another fund so you should be sure to get a copy of the fund's prospectus and read it carefully before buying shares through an exchange. (824) Filing by Voyageur Tax-Free Funds Pursuant to Rule 425 under the Securities Act of 1933, Subject Company - Delaware Tax-Free Minnesota Insured Fund, a series of Voyageur Insured Funds, Commission File No. 811-04973 Dear Financial Advisor, The letter below is being mailed to your clients who are shareholders of Delaware Tax-Free Minnesota Insured Fund. As the letter explains, the Board of Trustees of Voyageur Insured Funds has approved a proposal that the Fund be reorganized into Delaware Tax-Free Minnesota Fund. The reorganization requires shareholder approval, which will be sought at a shareholder meeting to be held later this year. It is anticipated that your clients will receive their proxy materials in the middle of October. In addition to the letter, your clients will receive overview materials (also enclosed) that describe the proposed reorganization in more detail. For more information about the proposal, contact your regional wholesaler, who can explain the reorganization and provide a detailed comparison of the two Funds. The Delaware Investments dealer services team is also available to help you. They can be reached at 800 362-7500. [Delaware Investments Logo] August 28, 2006 Dear Shareholder: I am writing to tell you about a significant change that has been proposed for Delaware Tax-Free Minnesota Insured Fund. The Board of Trustees of Delaware Investments(R)Family of Funds has approved a proposal to reorganize Delaware Tax-Free Minnesota Insured Fund with and into Delaware Tax-Free Minnesota Fund, subject to shareholder approval. The Board of Trustees responsible for Delaware Tax-Free Minnesota Fund has also approved the reorganization. It is anticipated that you will be asked to approve the proposed merger at a shareholder meeting to be held in late November 2006. Prior to that time, you will receive a combined prospectus / proxy statement. The statement will explain your voting rights and provide a discussion of the merger. Any solicitation of proxies by Delaware Tax-Free Minnesota Insured Fund in connection with this shareholder meeting will be made only pursuant to separate proxy materials filed under the federal securities laws. It is anticipated that these proxy materials will be distributed to the Fund's shareholders in October 2006. There can be no assurance that the shareholders of the Fund will vote in favor of the proposed reorganization. We urge you to read the proxy materials carefully when you receive them, and we remind you that your vote is important. The investment objectives of Delaware Tax-Free Minnesota Insured Fund and Delaware Tax-Free Minnesota Fund are the same: to seek high current income exempt from federal income taxes (including the federal alternative minimum tax) and from Minnesota state personal income taxes, consistent with preservation of capital. Each Fund seeks to achieve its investment objectives by investing at least 80% of its net assets in municipal securities. However, Delaware Tax-Free Minnesota Insured Fund is required to invest at least 80% of its assets in insured securities. Therefore, the most significant difference between the Funds is that Delaware Tax-Free Minnesota Fund is not required to make a specific allocation to insured securities. The proposed reorganized fund may potentially benefit by the growth in assets realized by combining the Funds. A larger fund can potentially realize cost savings due to economies of scale from the spreading of fixed costs over a larger asset base, and by reaching, or utilizing to a greater extent, breakpoints in investment management fees. Both Funds are currently managed by the same team of portfolio managers, and no management changes are expected as part of the merger. Any account options that you may have elected for your current account(s) in Delaware Tax-Free Minnesota Insured Fund (such as automatic investing plans and systematic withdrawal plans) will be carried over to Delaware Tax-Free Minnesota Fund. If you do not wish to participate in the reorganization, you may exchange your shares of Delaware Minnesota Tax-Free Fund for shares of any other Delaware Investments mutual fund.* If you do not wish to exchange into another Delaware Investments mutual fund, you may liquidate your shares in full. Please keep in mind you may be subject to applicable taxes. Please note that liquidations will be subject to any applicable contingent deferred sales charges (CDSCs); such fees will not be waived as part of the reorganization. If you have any questions about these changes or how they will affect your Delaware Investments account(s), I encourage you to contact your financial advisor or call our shareholder service center at 800-523-1918. Our service representatives are available to help you from 8:00 a.m. to 7:00 p.m. EST, Monday through Friday. In connection with the proposed Reorganization, Delaware Tax-Free Minnesota Insured Fund and Voyageur Tax-Free Funds, on behalf of the Delaware Tax-Free Minnesota Fund, intend to file relevant materials with the U.S. Securities and Exchange Commission (the "SEC"), including a Form N-14 combined proxy statement for the Fund and a registration statement for Delaware Tax-Free Minnesota Fund that will contain a prospectus. Because those documents will contain important information, the Fund's shareholders are urged to read them carefully when they become available. When filed with the SEC, those documents will be available free of charge at the SEC's website, www.sec.gov. The Fund's shareholders will also be able to obtain copies of these documents and other transaction-related documents free of charge, when available, by calling Delaware Investments toll-free at 800-523-1918. The foregoing is not an offer to sell, nor a solicitation of an offer to buy, shares of any fund, nor is it a solicitation of any proxy. We thank you for your confidence in Delaware Investments, and we look forward to continuing to play an important part in your financial plan. Sincerely, /s/Patrick P. Coyne Patrick P. Coyne Chairman Delaware Investments(R)Family of Funds Delaware Investments is the marketing name of Delaware Management Holdings, Inc. and its subsidiaries. Retail mutual fund advisory services are provided by Delaware Management Company, a series of Delaware Management Business Trust (DMBT). DMBT is a registered investment advisor and a subsidiary of Delaware Management Holdings, Inc. * When exchanging Class B and Class C shares of one fund for the same class of shares in other funds, your new shares will be subject to the same contingent deferred sales charge as the shares you originally purchased. The holding period for the contingent deferred sales charge will also remain the same, with the amount of time you held your original shares being credited toward the holding period of your new shares. You don't pay sales charges on shares that you acquired through the reinvestment of dividends. You may have to pay taxes on your exchange. When you exchange shares, you are purchasing shares in another fund so you should be sure to get a copy of the fund's prospectus and read it carefully before buying shares through an exchange. (825)