ROCHESTER, NY — May 1, 2006 — Mpower Communications Corp. (AMEX:MPE), a leading provider of data and voice services to retail and wholesale business customers , will host a public conference call to discuss the details of its first quarter 2006 financial and operating results.

Date: Tuesday, May 9, 2006

Time: 10:00 a.m. (Eastern time)

Webcast & AudioStreaming Link/Instructions:

http://showvisuals.mshow.com/findshow.aspx?usertype=0&cobrand=128&shownumber=297550

This link will access both the audio and PowerPoint presentation for the call. Advanced registration on the site is recommended. Click on the link above to register in advance and/or join the conference call at the designated time.

Web Cast Replay: Available for 30 days after the call at above link

Audio Live Number: 1-888-332-7254, PIN #7326607

Audio Replay Number: 1-877-519-4471, PIN #7326607
From Tuesday, May 9, 2006 at 1:00 p.m. Eastern through Tuesday, May 16, 2006 at 5:00 p.m. Eastern

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 www.mpowercom.com.