AOC Aon Corp.

Company to Leverage Executive's Experience in Carrier and TPA Markets SAN RAMON, Calif., June 28 /PRNewswire-FirstCall/ -- Valley Oak Systems, Inc., an Aon company (NYSE:AOC), announced today that James Wedster has joined as vice president of product development. This position marks a strategic executive expansion at Valley Oak Systems, a leader in claims management software, services, and support. Wedster will help define the development and expansion of Valley Oak's flagship product, the iVOS(R) "one- system" claims management solution, and play a significant role in iVOS' integration with RiskConsole, Aon's comprehensive risk management information system. (Logo: http://www.newscom.com/cgi-bin/prnh/20041215/CGW049LOGO) Now part of Aon's premier distribution network, Valley Oak Systems plans to broaden its reach in the insurer and third-party administrator (TPA) markets. Wedster brings valuable experience toward this objective. He served in leadership roles at several insurance companies and TPAs, and has more than 18 years of experience in IT planning and business-aligned software development for these organizations. Most recently, Wedster worked as vice president of strategic systems at Broadspire, a Crawford company and leading TPA. He also worked in management positions at CNA Insurance and Zurich North America. "Jim brings a high level of insurance and claims expertise at a critical point in our company's development," said Randy Wheeler, CEO of Valley Oak Systems. "With our integration into Aon eSolutions, Valley Oak's top priority is to enhance our product offering to continue to meet client needs and to expand our market reach into untapped areas. Jim's leadership and success in the carrier and TPA space will be highly conducive to our growth in these areas. Our growing pool of talent and depth of knowledge continues to establish our newly integrated Aon eSolutions group as the premier provider of global claims and risk management solutions." About Valley Oak Systems, Inc. Founded in 1994, Valley Oak Systems (http://www.valleyoak.com/) provides high quality software that enables clients to achieve outstanding efficiency and performance in insurance administration, including claims management, medical bill review, policy underwriting, 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 (http://www.aon.com/) is a leading provider of risk management services, insurance and reinsurance brokerage, human capital and management consulting, and specialty insurance underwriting. There are 43,000 employees working in Aon's 500 offices in more than 120 countries. Backed by broad resources, industry knowledge and technical expertise, Aon professionals help a wide range of clients develop effective risk management and workforce productivity solutions. Contact: Cynthia Chow Valley Oak Systems 925-242-4600 This press release contains certain statements related to future results, or states our intentions, beliefs and expectations or predictions for the future which are forward-looking statements as that term is defined in the Private Securities Litigation Reform Act of 1995. These forward-looking statements are subject to certain risks and uncertainties that could cause actual results to differ materially from either historical or anticipated results depending on a variety of factors. Potential factors that could impact results include: general economic conditions in different countries in which we do business around the world, changes in global equity and fixed income markets that could affect the return on invested assets, fluctuations in exchange and interest rates that could influence revenue and expense, rating agency actions that could affect our ability to borrow funds, funding of our various pension plans, changes in the competitive environment, our ability to implement restructuring initiatives and other initiatives intended to yield cost savings, our ability to execute the stock repurchase program, potential regulatory or legislative changes that would affect our ability to sell, and be reimbursed at current levels for, our Sterling subsidiary's Medicare health product, changes in commercial property and casualty markets and commercial premium rates that could impact revenues, changes in revenues and earnings due to the elimination of contingent commissions, other uncertainties surrounding a new compensation model, the impact of investigations brought by state attorneys general, state insurance regulators, federal prosecutors, and federal regulators, the impact of class actions and individual lawsuits including client class actions, securities class actions, derivative actions, ERISA class actions, the impact of the analysis of practices relating to stock options, the cost of resolution of other contingent liabilities and loss contingencies, and the difference in ultimate paid claims in our underwriting companies from actuarial estimates. Further information concerning the Company and its business, including factors that potentially could materially affect the Company's financial results, is contained in the Company's filings with the Securities and Exchange Commission. http://www.newscom.com/cgi-bin/prnh/20041215/CGW049LOGO http://photoarchive.ap.org/ DATASOURCE: Aon Corporation CONTACT: Cynthia Chow of Valley Oak Systems, +1-925-242-4600, Web site: http://www.aon.com/ http://www.valleyoak.com/

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