All communications hereunder will be in writing and effective only on receipt, and, if sent to the Representatives, will be mailed, delivered or telefaxed to Morgan Stanley & Co. LLC, 1585 Broadway, New York, NY 10036, Attention: Convertible Debt Syndicate Desk, with a copy to the Legal Department, and Barclays Capital Inc., 745 Seventh Avenue, New York, NY 10019, Attention: Syndicate Registration, Facsimile: (646) 834-8133; or, if sent to the Company, will be mailed, delivered or telefaxed to 408-317-0310 and confirmed to it at 1 Wayside Road, Burlington, Massachusetts 01803, attention of the Legal Department with a copy to Wilson, Sonsini, Goodrich & Rosati, 1700 K Street, NW Fifth Floor, Washington, DC 20006, telefax 212-999-5899, Attention: Robert Sanchez.