Prospectus excerpt:  Dividends on the MTP Shares will be payable monthly. The first dividend period for the MTP Shares will commence on the first date of original issuance of MTP Shares and end on April 30, 2010 and each subsequent dividend period will be a calendar month (or the portion thereof occurring prior to the redemption of such MTP Shares). Dividends will be paid on the first business day of the month next following a dividend period and upon redemption of the MTP Shares, except that dividends paid with respect to any dividend period consisting of the month of December in any year will be paid on the last business day of December. Except for the first dividend period, dividends with respect to any monthly dividend period will be declared and paid to holders of record of MTP Shares as their names shall appear on the registration books of the Fund at the close of business on the 15th day of such monthly dividend period (or if such day is not a business day, the next preceding business day). Dividends with respect to the first dividend period for the MTP Shares will be declared and paid to holders of record of such MTP Shares as their names appear on the registration books of the Fund at the close of business on April 29, 2010.

The Fund is required to redeem the MTP Shares on April 1, 2015 unless earlier redeemed or repurchased by the Fund. In addition, MTP Shares are subject to optional and mandatory redemption in certain circumstances. As of April 1 , 2011, the Series 2015 MTP Shares will be subject to redemption at the option of the Fund, subject to payment of a premium through March 31, 2012, and at par thereafter. The Series 2015 MTP Shares also will be subject to redemption, at the option of the Fund, at par in the event of certain changes in the credit rating of the MTP Shares, as described herein. See ôDescription of MTP SharesùRedemption.ö

The dividend rate for MTP Shares assumes that each monthÆs distribution is comprised solely of dividends exempt from regular federal and Massachusetts income taxes, although a portion of those dividends may be subject to the federal alternative minimum tax. From time to time, the Fund may be required to allocate capital gains and/or ordinary income to a given monthÆs distribution on MTP Shares. To the extent that it does so, the Fund will contemporaneously make a separate, supplemental distribution of an amount that, when combined with the total amount of regular tax-exempt income, capital gains and ordinary income in the monthly distribution, is intended to make the two distributions equal on an after-tax basis (determined based upon the maximum marginal federal income tax rates in effect at the time of such payment) to the amount of the monthly distribution if it had been entirely comprised of dividends exempt from regular federal and Massachusetts income taxes. Alternatively (particularly in cases where the amount of capital gains or ordinary income to be allocated to the MTP Shares is small), the Fund will satisfy the requirement to allocate capital gains or ordinary income to MTP Shares by making a supplemental distribution of such gains or income to holders of MTP Shares, over and above the monthly dividend that is fully exempt from regular federal and Massachusetts income taxes. If, in connection with a redemption of MTP Shares, the Fund allocates capital gains or ordinary income to a distribution on MTP Shares without having made either a contemporaneous supplemental distribution of an additional amount or an alternative supplemental distribution of capital gains and/or ordinary income, it will cause an additional amount to be distributed to holders of MTP Shares whose interests are redeemed, which amount, when combined with the total amount of regular tax-exempt income, capital gains and ordinary income allocated in the distribution, is intended to make the distribution and the additional amount equal on an after-tax basis (determined based upon the maximum marginal federal income tax rates in effect at the time of such payment) to the amount of the distribution if it had been entirely comprised of dividends exempt from regular federal income tax. Investors should consult with their own tax advisors before making an investment in the MTP Shares. See ôTax Mattersö and ôDescription of MTP SharesùDividends and Dividend PeriodsùDistribution with respect to Taxable Allocations.ö

MTP Shares will be senior securities that represent stock of the Fund and are senior, with priority in all respects, to the FundÆs common shares as to payments of dividends and as to distribution of assets upon dissolution, liquidation or winding up of the affairs of the Fund. MTP Shares will have equal priority as to payments of dividends and as to distribution of assets upon dissolution, liquidation or winding up of the affairs of the Fund with other preferred shares currently outstanding. The Fund may issue additional preferred shares on parity with MTP Shares, subject to certain limitations. The Fund may not issue additional classes of shares that are senior to MTP Shares and other outstanding preferred shares of the Fund as to payments of dividends or as to distribution of assets upon dissolution, liquidation or winding up of the affairs of the Fund. See ôDescription of MTP Shares.ö The Fund, as a fundamental policy, may not issue debt securities that rank senior to MTP Shares. In addition, as a fundamental policy, the Fund may not borrow money, except from banks for temporary or emergency purposes, or for repurchase of its shares, subject to certain restrictions. See ôInvestment Restrictionsö in the Statement of Additional Information.

The redemption and paying agent for MTP Shares will be State Street Bank and Trust Company, Canton, Massachusetts.