<Page> Exhibit 3.7 [NOVA SCOTIA LOGO] CERTIFICATE OF INCORPORATION Companies Act REGISTRY NUMBER 3090672 NAME OF COMPANY 3090672 NOVA SCOTIA COMPANY I hereby certify that the above-mentioned company was incorporated this date under the Companies Act and that the liability of the members is unlimited. /s/ [ILLEGIBLE] June 22, 2004 ------------------------------------------- --------------------- Agent of the Registrar of Joint Stock Companies Date of Incorporation