ROCHESTER, NY—February 2, 2004—Mpower Holding Corporation (AMEX:MPE), 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 fourth quarter and year-end 2003 results on Thursday, February 12, 2004 at 10:00 a.m. Eastern. To access the call, dial 1-866-769-3706.

A replay of the call will be available from Thursday, February 12, 2004 at 1:00 p.m. Eastern through Thursday, February 19, 2004 at 5:00 p.m. Eastern by dialing 1-877-519-4471, PIN #4484777.

About Mpower Holding Corporation
Mpower Holding Corporation (AMEX:MPE) 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 www.mpowercom.com.