EXHIBIT 99.4

(CIBC MELLON LOGO)


		May 18, 2005	REVISED


Nova Scotia Securities Commission		Securities Commission of Newfoundland and Labrador

Alberta Securities Commission		Saskatchewan Financial Services Commission, Securities Division

The Manitoba Securities Commission		Office of the Administrator of the Securities Act, New Brunswick

Ontario Securities Commission		British Columbia Securities Commission

Registrar of Securities, Prince Edward Island		Autorité des marchés financiers

Dear Sirs:

RE: CALL-NET ENTERPRISES INC.

Pursuant to a request from our Principal, we wish to advise you of the following dates in connection with their Special Meeting of Shareholders:



	*DATE OF MEETING:*			*June 29 , 2005*
	RECORD DATE FOR NOTICE:			May 17, 2005
	RECORD DATE FOR VOTING:			May 17, 2005
	BENEFICIAL OWNERSHIP DETERMINATION DATE:			May 17, 2005
	SECURITIES ENTITLED TO NOTICE:			N/A
	SECURITIES ENTITLED TO VOTE:			New Class B Non-Voting
				New Common

Yours very truly,
CIBC MELLON TRUST COMPANY

Vijaya Murugaanandan
Administrator, Client Services
Direct Dial: (416) 643-5567

cc: CDS & Co. (Via Fax)

pk\NM_CallNet

CALL-NET ENTERPRISES INC 6-K