All notices and other communications to any Debtor under this Agreement shall be in writing and shall be delivered by hand or overnight courier service, mailed by certified or registered mail or sent by facsimile or telecopier to such Debtor at its chief executive office set forth on Schedule 3.3 or at such other address in the United States, Canada or Luxembourg as may be specified by such Debtor in a written notice delivered to the Administrative Agent at such office as the Administrative Agent may designate for such purpose from time to time in a written notice to the US Borrower.