Mpower Communications Connects St. Rose Hospital Campus

LOS ANGELES, CA—September 29, 2003—Mpower Communications Corp. (AMEX:MPE), a leading provider of high-speed Internet access and local and long distance voice services, today announced that it has been selected to be the exclusive provider of voice and data communications services for St. Rose Hospital in Hayward, CA.

Mpower's dedicated broadband services provide vital links between the hospital's acute care facility, administrative offices and tertiary care sites as well as the new Alameda Oncology Center on the campus.

"Mpower's team is truly world class," said Kenneth Henkelman, Director of Facilities Services for St. Rose Hospital. "Their attention to every detail, specifically our reliability requirements as a 24x7 medical care facility, made them stand out from past providers. We are truly delighted to have Mpower as our business partner."

Jim Ferguson, President of Sales and Marketing for Mpower added, "Our team of knowledgeable professionals worked closely with the staff at St. Rose to put together a solution that met the hospital's specific needs. Our ability to provide communications services that are reliable and scalable is a main reason why Mpower continues to win over the confidence of customers like St. Rose whose communications services are critical to their operations."

About St. Rose Hospital
Founded in 1962, St. Rose Hospital is an acute, general, not-for-profit, 175-bed facility serving the needs of the diverse cultural and ethnic population of southern Alameda County and its environs. The hospital is a member of the Via Christi Health System and is committed to providing quality health care services to the residents of Hayward, Union City, and the surrounding communities. For more information please see www.strosehospital.org/.

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, Internet access and Web hosting services as well as local, domestic and international calling plans for business customers. Further information about the company can be found at www.mpowercom.com.

Forward-Looking Statements
Under the safe harbor provisions of the Private Securities Litigation Reform Act of 1995, Mpower Holding Corporation cautions investors that certain statements contained in this press release that state management's intentions, hopes, beliefs, expectations or predictions of the future are forward-looking statements. Management wishes to caution the reader these forward-looking statements are not historical facts and are only estimates or predictions. Actual results may differ materially from those projected as a result of risks and uncertainties including, but not limited to, receipt of all remaining payments from the previously announced asset sales, future sales growth, market acceptance of our product offerings, our ability to secure adequate financing or equity capital to fund our operations, network expansion, our ability to manage growth and maintain a high level of customer service, the performance of our network and equipment, our ability to enter into strategic alliances or transactions, the cooperation of incumbent local exchange carriers in provisioning lines and interconnecting our equipment, regulatory approval processes, changes in technology, price competition and other market conditions and risks detailed from time to time in our Securities and Exchange Commission filings. The company undertakes no obligation to update publicly any forward-looking statements, whether as a result of future events, new information, or otherwise.

Mpower Communications Investor Contact:	Mpower Communications Media Contact:	Mpower Investor Relations Contact:
Gregg Clevenger	Michele Sadwick	Lester Rosenkrantz
Chief Financial Officer	Vice President	Cameron Associates
585.218.6547	585.218.6542	212.554.5486
invest@mpowercom.com	msadwick@mpowercom.com	Lester@cameronassoc.com