Any and all notices, requests, demands, acceptances, appointments and other communications provided for by this Agreement shall be in writing (including telex, telecopy or similar tele-transmission) and shall be effective when actually delivered in person or, if mailed, five (5) days after having been deposited in the United States mail, postage prepaid, registered or certified and addressed to you at your last known address on the books of the Company, or in the case of the Company, addressed to its principal place of business, attention of Chief Executive Officer, or to such other address as either party may specify by notice to the other.