ROCHESTER, NY — February 2, 2005 — Mpower Communications Corp. (AMEX:MPE), a leading provider of broadband Internet access, private line and voice services will hold a public conference call to discuss its fourth quarter and year-end 2004 results on Thursday, February 10, 2005 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 10, 2005 at 1:00 p.m. Eastern through Thursday, February 17, 2005 at 5:00 p.m. Eastern by dialing 1-877-519-4471, PIN #5675076.

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 private line, data, telephony, Internet access and Web hosting services for business customers and carriers. Further information about the company can be found at www.mpowercom.com.