be a waiver of, or acquiescence in, any breach of any representation, warranty, covenant or agreement contained herein, nor shall any single or partial exercise of any such right preclude other or further exercise thereof or of any other right. All rights and remedies existing under this Agreement or the Schedules attached hereto are cumulative to, and not exclusive of, any rights or remedies otherwise available. Section 10.6 Notices. Unless otherwise expressly provided herein, all notices, claims, certificates, requests, demands and other communications hereunder shall be in writing and shall be deemed to be duly given (i) when personally delivered or (ii) if mailed by registered or certified mail, postage prepaid, return receipt requested, on the date the return receipt is executed or the letter is refused by the addressee or its agent or (iii) if sent by overnight courier which delivers only upon the signed receipt of the addressee, on the date the receipt acknowledgment is executed or refused by the addressee or its agent or (iv) if sent by facsimile or electronic mail, on the date confirmation of transmission is received (provided that a copy of any notice delivered pursuant to this clause (iv) shall also be sent pursuant to clause (i), (ii) or (iii)), addressed to the attention of the addressee's General Counsel at the address of its principal executive office or to such other address or facsimile number for a Party as it shall have specified by like notice. Section 10.7 Counterparts. This Agreement, including the Schedules and Exhibits hereto and the other documents referred to herein, may be executed in multiple counterparts, each of which when executed shall be deemed to be an original but all of which together shall constitute one and the same agreement. Section 10.8 Severability. If any term or other provision