MHI Pioneer Municipal High Income Fund Inc

Pioneer Investments today announced that it will hold a conference call regarding Pioneer Municipal High Income Advantage Trust (NYSE: MAV) and Pioneer Municipal High Income Trust (NYSE: MHI). Portfolio Manager David Eurkus will be on the call to discuss the recent performance of both funds. The conference call will be open to the public. The call will be held on October 21, 2008 at 4:00 PM EDT, and can be accessed by calling 866-360-7030 (Conference #67298015). The call will be available for replay for the week following the call at 800-642-1687, and a transcript will be posted to us.pioneerinvestments.com. Pioneer Investment Management, Inc., the investment advisor for these funds, is part of Pioneer Investment Management USA Inc., the U.S. subsidiary of Pioneer Global Asset Management S.p.A. Shareholder Inquiries: � Please contact your financial advisor or visit � us.pioneerinvestments.com � Broker/Advisor Inquiries Please Contact: 800-622-9876 � Media Inquiries Please Contact: Corporate Communications 617-422-4727 Closed-end funds, unlike open-end funds, are not continuously offered. There is a one-time public offering and once issued, shares of closed-end funds are sold in the open market through a stock exchange and frequently trade at prices lower than their net asset value. Net asset value (NAV) is total assets less total liabilities divided by the number of common shares outstanding. Please consider the fund's investment objectives, risks, charges and expenses carefully before investing. The prospectus contains this and other information about the fund and should be read carefully before you invest or send money. To obtain a prospectus and for other information on Pioneer funds, contact your advisor or visit our web site: us.pioneerinvestments.com. Pioneer Funds Distributor, Inc., Member SIPC �2008 Pioneer Investment Management, Inc. 60 State Street Boston, MA 02109 Member of the UniCredit Banking Group, Register of Banking Groups