Mpower Announces Early Termination of Hart-Scott-Rodino Act Waiting Period

ROCHESTER, N.Y., June 6  /PRNewswire-FirstCall/ -- Mpower Holding Corporation (AMEX:MPE), the parent company of Mpower Communications Corp., a leading provider of data and voice services to retail and wholesale business customers, today announced that it has received notification from the Federal Trade Commission of early termination of the waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, with respect to the Company's proposed merger with U.S. TelePacific Holdings Corp.  The closing of the merger transaction remains subject to other conditions, including the approval of the Company's stockholders and receipt of applicable approvals from the Federal Communications Commission and certain state public utility commissions that regulate the Company's business.

Additional Information and Where to Find It

In connection with the proposed merger, the Company will file a definitive proxy statement with the Securities and Exchange Commission (the "SEC"). Investors and security holders are advised to read the definitive proxy statement when it becomes available, because it will contain important information.  Investors and security holders may obtain a free copy of the definitive proxy statement (when available) and other documents filed by the Company at the SEC's web site at http://www.sec.gov/.  The definitive proxy statement and such other documents may also be obtained for free from the Company by directing such request to the Company, Attention:  Russ Zuckerman, General Counsel, 175 Sully's Trail, Suite 300, Pittsford, New York 14534 Telephone:  [phone].

The Company and its directors, executive officers and other members of its management and employees may be deemed to be participants in the solicitation of proxies from its shareholders in connection with the proposed merger. Information concerning the interests of the Company's participants in the solicitation is set forth in the Company's proxy statements and Annual Reports on Form 10-K, previously filed with the SEC, and in the proxy statement relating to the merger when it becomes available.

About Mpower Holding Corporation

Founded in 1996, Mpower Holding Corporation is the parent company of Mpower Communications Corp., a leading facilities-based broadband communications provider offering a full range of data, telephony, Internet access and network services for retail business and wholesale customers in California, Nevada and Illinois.  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 SEC.  We undertake no obligation to update publicly any forward-looking statements, whether as a result of future events, new information, or otherwise. 

DATASOURCE: Mpower Holding Corporation



CONTACT:  Investors: Gregg Clevenger, Chief Financial Officer,

[phone], , or Media: Michele Sadwick, Vice

President, [phone], , both of Mpower

Communications



Web site:  http://www.mpowercom.com/ 

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