ILOG Moves U.S. Headquarters To Larger Sunnyvale Facility To Support Growth and Expansion

Sunnyvale Mayor Otto Lee Awards Company Certificate of Congratulation on 20th Anniversary

SUNNYVALE, Calif. – May 21, 2007 - ILOG® (NASDAQ: ILOG; Euronext; ILO, ISIN: FR0004042364) today announced it has moved its U.S. headquarters to a larger facility at 1195 West Fremont Avenue in Sunnyvale, Calif., in the heart of Silicon Valley, to support the company’s growth and expansion. Sunnyvale Mayor Otto Lee and ILOG Chairman and CEO Pierre Haren marked the move with a ribbon-cutting ceremony today. The expansion to the larger Sunnyvale facility coincides with ILOG’s 20th anniversary as a company and 10th anniversary as a NASDAQ-listed company. To mark this achievement, the Mayor awarded the company a Certificate of Congratulation at the ribbon-cutting ceremony.

The 80,000 square-feet facility will house ILOG's U.S. finance and administration, sales, training and support services, marketing operations and research and development.

"We're excited to welcome an innovation-driven company like ILOG to our city and would like to congratulate ILOG on its 20-year run and 10-year anniversary on NASDAQ. I am proud to present ILOG the Certificate of Congratulation," said Otto Lee, Mayor of Sunnyvale. “ILOG has been a prominent part of Silicon Valley for the past 15 years, and this growth and expansion to the new facility and ILOG’s longevity is a testament to that. We wish ILOG continued growth and success.”

"We would like to thank Mayor Lee for being a part of ILOG's history by attending this ceremony," said Pierre Haren, chairman and CEO of ILOG. "We believe in being innovation leaders and we will continue to contribute to the Valley in a meaningful way. Through the past 20 years, ILOG has strived to be true to the spirit of innovation and change that makes Silicon Valley unique."

Since its founding in 1987, ILOG has expanded from a handful of people in a small office in Paris to a multinational corporation with more than 800 employees in nine countries. ILOG's product offerings have evolved significantly during this time. Twenty years ago this month, ILOG was founded on the idea that object-oriented programming and artificial intelligence could be combined and commercialized as software components to help organizations create the next generation of smarter software applications. From its origin as a software tools and components provider, the company now offers software platforms such as business rule management systems (BRMS), and a line of supply chain scheduling applications based on the company’s three core technologies – business rules, optimization and visualization.

About ILOG
ILOG delivers software and services that empower customers to make better decisions faster and manage change and complexity. Over 2,500 corporations and more than 465 leading software vendors rely on ILOG’s market-leading business rule management systems (BRMS), supply chain planning and scheduling applications as well as its optimization and visualization software components, to achieve dramatic returns on investment, create market-defining products and services, and sharpen their competitive edge. ILOG was founded in 1987 and employs more than 800 people worldwide. For more information, please visit www.ilog.com.

ILOG is a registered trademark and JRules is a trademark of ILOG S.A. and ILOG, Inc.