0000950123-00-005949 Sample Contracts

Exhibit 4.2 REGISTRATION RIGHTS AGREEMENT 13% Senior Notes due 2010 Dated as of March 24, 2000

Registration Rights Agreement • June 22nd, 2000 • Mpower Holding Corp • Telephone communications (no radiotelephone) • New York

• Contract Type
  Registration Rights Agreement
• Filed
  June 22nd, 2000
• Company
  Mpower Holding Corp
• Industry
  Telephone communications (no radiotelephone)
• Jurisdiction
  New York

and

Purchase Agreement • June 22nd, 2000 • Mpower Holding Corp • Telephone communications (no radiotelephone)

• Contract Type
  Purchase Agreement
• Filed
  June 22nd, 2000
• Company
  Mpower Holding Corp
• Industry
  Telephone communications (no radiotelephone)