Mpower Holding Corporation Announces First Quarter 2004 Earnings Conference Call ROCHESTER, N.Y., April 20 /PRNewswire-FirstCall/ -- Mpower Holding Corporation (BULLETIN BOARD: MPOW) , the parent company of Mpower Communications, a provider of broadband high-speed Internet access and telephony services to business customers, will hold a public conference call to discuss its first quarter 2004 results on Thursday, May 6, 2004 at 10:00 a.m. Eastern. To access the call, dial 1-877-780-2271. A replay of the call will be available from Thursday, May 6, 2004 at 1:00 p.m. Eastern through Thursday, May 13, 2004 at 5:00 p.m. Eastern by dialing 1-877-519-4471, PIN #4718186. About Mpower Holding Corporation Mpower Holding Corporation (OTCBB) is the parent company of Mpower Communications, a leading facilities-based broadband communications provider offering 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 Holding Corporation CONTACT: Investor: Gregg Clevenger, +1-585-218-6547, ; Investor Relations: Lester Rosenkrantz of Cameron Associates, +1-212-554-5486, ; Media: Michele Sadwick of Mpower Communications, +1-585-218-6542, Web site: http://www.mpowercom.com/

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