Thursday, January 27, 2011 Mr. Brian Hooper, Vice President Mechanical Systems Inc. 10-12 Delaware Drive Salem, NH 03079 Dear Brian, On behalf of Hittite Microwave Corporation I would personally like to take this opportunity to express our sincere appreciation for the outstanding efforts MSI has provided on the numerous projects throughout our buildings. Since we have partnered, performance and reliability of our environmental conditions have significantly improved thanks to the service and dedication of your team. I always experience service from technicians that are very organized, competent and neat and always done in a highly professional manner. The high level of confidence and comfort I have with your staff is rarely found and appreciated when managing a manufacturing operation where environmental conditions are critical. It has been a pleasure to have the professional working relationship between our companies and I look forward working with you on future endeavors. Sincerely, Mark Burlamachi Facilities Manager Hittite Microwave Corp. 20 Alpha Road Chelmsford, Ma 018823