MPE Bank of America Corp. Market Index Target Term Securities (Mitts) Linked TO The S&P 500 Index

ROCHESTER, N.Y., Sept. 19 /PRNewswire-FirstCall/ -- Mpower Holding Corporation (AMEX:MPE), the parent company of Mpower Communications Corp., a leading provider of data and voice services to retail and wholesale business customers, will be presenting at the Jefferies 3rd Annual Communications & Media Conference today, Monday, September 19, 2005 from 10:20 to 11:00 a.m. EST. Mpower Communications Chairman and Chief Executive Officer Rolla P. Huff and Chief Financial Officer Gregg Clevenger, will present an overview of the company, its growth strategies and position within the telecommunications industry. The conference is being held at the Mandarin Oriental Hotel, 80 Columbus Circle at 60th Street in New York City. A Webcast of this presentation will be available at http://www.jefferies.com/0905Comm, and the presentation can be found on Mpower's Web site, http://www.mpowercom.com/. About Mpower Communications Mpower Communications (AMEX:MPE) is a facilities-based broadband communications provider established in 1996. Mpower offers a full range of data, telephony, Internet access and Web hosting services for small and medium-size business customers. Further information about the company can be found at http://www.mpowercom.com/. DATASOURCE: Mpower Communications Corporation CONTACT: Media, Michele Sadwick, Vice President, +1-585-218-6542, or , or Investors, Gregg Clevenger, Chief Financial Officer, +1-585-218-6547, or , both of Mpower Communications Corporation Web site: http://www.mpowercom.com/ http://www.jefferies.com/0905Comm

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