Important Notice to our Customers Product Change Notice # WE140903-3 Date: September 3, 2014 Re: PFC FrontEnd To Our Valued Customers: We appreciate your use of the PFC FrontEnd. The purpose of this notice is to inform you that the product line is being discontinued. PCN Type: Notice of product discontinuance requiring either a Last Time Buy or migration to an alternative product. Product(s) Affected: FE360 FE375 FE375-1 FE384 Customer Impact: Customers may calculate total lifetime needs for the product and place a last time buy order on or before November 3, 2014. Shipments may be scheduled for delivery as late as December 3, 2014. Company Contact: Jeff Lally Westcor Division of Vicor 560 Oakmead Parkway Sunnyvale, CA. 94085-4022 (408) 774-5560 Joe Sullivan Vicor Corporation 25 Frontage Road Andover, MA 01810 978-749-8359