SAN RAMON, Calif., Nov. 28 /PRNewswire-FirstCall/ -- Valley Oak Systems, Inc., a unit of Aon Corporation (NYSE: AOC) and a leading provider of insurance technology solutions, today announced it was named to Deloitte's prestigious Technology Fast 50 Program for Silicon Valley's Software & Information Technology companies -- a ranking of the fastest-growing companies in the area by Deloitte & Touche USA LLP, one of the nation's leading professional services organizations.

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In addition, Valley Oak Systems was ranked among the Inc. 5,000 -- the recently expanded Inc. magazine listing of the fastest-growing private companies in the country. The Inc. 5,000 ranked privately held companies according to averaged year-over-year sales growth from 2002 to 2006 in the most comprehensive analysis of entrepreneurial companies.

Valley Oak Systems also received the Hall of Fame Award from San Francisco Business Times and the Longevity Award from East Bay Business Times for making their lists of fastest-growing private companies five years in a row.

Randy Wheeler, founder and chief executive officer of Valley Oak Systems, commented on the recent recognitions: "The key factor to our success has been a well-orchestrated business strategy, which reflects our in-depth expertise in insurance business processes, dedication to total customer satisfaction, and leading-edge technology that provides demonstrable business value. It's been a great run as an entrepreneurial start-up. Since our company was acquired by Aon, 2006 was the last year we qualified for private-company recognitions. It's an end of an era, but our entrepreneurial spirit continues to live on -- now backed by Aon's strength in the risk and insurance market."

Valley Oak Systems is a highly regarded insurance technology provider. Its flagship product iVOS®, the "one-system" claims management solution, has experienced tremendous demand and driven company growth by as much as 493 percent over a five year period. The iVOS claims system offers a wide array of system capabilities to assist adjusters in processing claims, including diary, scheduling, document imaging, workflow management, and automation tools. The system can be customized to meet an organization's specific claims-management needs. Clients choose the modules essential to service their unique workflow, processes and business objectives.

About Valley Oak Systems, Inc.

Founded in 1994, Valley Oak Systems (http://www.valleyoak.com/), a unit of Aon Corporation (NYSE: AOC), provides high quality software that enables clients to achieve outstanding efficiency and performance in insurance administration, including claims management, medical bill review, policy administration, case management, billing and events. Due to its client-focused approach, Valley Oak Systems has established itself as an industry leader in insurance solutions, and its comprehensive iVOS system was recognized for its business impact with the 2006 IASA Technology Achievement Award.

About Aon

Aon Corporation (NYSE: AOC) is the leading global provider of risk management services, insurance and reinsurance brokerage, human capital and management consulting, and specialty insurance underwriting. Through its 43,000 professionals worldwide, Aon readily delivers distinctive client value via innovative and effective risk management and workforce productivity solutions. Our industry-leading global resources, technical expertise and industry knowledge are delivered locally through more than 500 offices in more than 120 countries. Aon was ranked by A.M. Best as the number one global insurance brokerage in 2007 based on brokerage revenues, and voted best insurance intermediary, best reinsurance intermediary, and best employee benefits consulting firm in 2007 by the readers of Business Insurance. For more information on Aon, log onto http://www.aon.com/.

  Media Contact:
  Cynthia Chow
  Valley Oak Systems
  925-242-4600
  cchow@valleyoak.com

SOURCE: Aon Corporation

CONTACT: Cynthia Chow of Valley Oak Systems, +1-925-242-4600,
cchow@valleyoak.com

Web site: http://www.aon.com/
http://www.valleyoak.com/