Mpower Communications Selected by Stock Building Supply for Communications Services in California LOS ANGELES, April 13 /PRNewswire-FirstCall/ -- Mpower Communications Corp. (AMEX:MPE), a leading provider of data and voice services to retail and wholesale business customers, today announced that it has been selected to provide communications services for the California locations of Stock Building Supply, the largest supplier of building materials to professionals in the United States. Under the terms of the two-year agreement, Mpower will be providing communications services to 18 Stock Building Supply retail outlets, as well as its corporate headquarters in Mission Hills, California. Working with Mpower offers many benefits to Stock Building Supply including the ability to manage communications services and expenses across multiple locations on one bill. In addition, with free LATA wide calling from Mpower, Stock Building Supply is able to place a majority of its calls between stores, customers and suppliers for no additional cost. "Mpower's customer service experience and response time are definitely an improvement compared to our previous telecom provider. The follow through is excellent and the cost savings are significant," said Afani Hokum, Credit and Sales Coordinator, California at Stock Building Supply. Jim Ferguson, President of Sales and Marketing for Mpower added, "Our team of sales and support experts has enjoyed building a positive relationship with Stock Building Supply. We are pleased to have customized a networking solution that enables Stock Building Supply to continue to grow its business while containing costs." About Stock Building Supply Raleigh, NC-based Stock Building Supply operates more than 236 locations in 26 states, with reported sales of $3.6 billion in the fiscal year 2004; ending July 31st. Stock Building Supply is a subsidiary of Wolseley plc of Theale, England, which had worldwide sales in fiscal year 2004 of over $18 billion. Wolseley is traded on the New York Stock Exchange as WOS. http://www.stockbuildingsupply.com/ . About Mpower Communications Founded in 1996, Mpower Communications (AMEX:MPE) is a leading facilities-based broadband communications provider offering a full range of data, telephony, Internet access and Web hosting services for retail business and wholesale customers. Further information about the company can be found at http://www.mpowercom.com/ . Forward-Looking Statements Under the safe harbor provisions of the Private Securities Litigation Reform Act of 1995, certain statements contained in this press release regarding our and/or management's intentions, hopes, beliefs, expectations or predictions of the future are forward-looking statements. 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 detailed from time to time in our filings with the Securities and Exchange Commission. We undertake no obligation to update publicly any forward-looking statements, whether as a result of future events, new information, or otherwise. DATASOURCE: Mpower Communications Corp. CONTACT: Investor, Gregg Clevenger, Chief Financial Officer, +1-585-218-6547, , or Media, Michele Sadwick, Vice President, +1-585-218-6542, ; Media Contact, Afani Hokum, Stock Building Supply, +1-818-256-1217, Web site: http://www.mpowercom.com/ http://www.stockbuildingsupply.com/

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