Aon (NYSE: AOC) announces that Aon Human Resources Outsourcing (Aon HRO), a division of Aon Consulting Inc., has formed a strategic alliance agreement with Employease, Inc., a leading provider of on-demand HR and benefits administration solutions. This alliance is the latest development in the growth and evolution of Aon HRO, adding HR and benefits outsourcing and insourcing capabilities.

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Aon HRO provides clients with comprehensive outsourced health and welfare services, defined benefit and defined contribution solutions, performance measurement and improvement services, hiring and training expertise, leadership, learning and human resources best practices and strategic consulting.

According to Gary Budzinski, president of Aon HRO, "Our alliance with Employease enhances Aon's ability to offer affordable, flexible and scalable HR and benefits technology and outsourcing solutions. Our clients with fewer than 2,500 employees will have the opportunity to use the Employease platform to reduce administrative burdens, improve service to employees and focus more effectively on strategy. With the Employease platform, Aon's clients can effectively outsource and insource HR administrative functions."

With Employease, Aon clients have the flexibility to choose the right mix of internal automation and external assistance to meet their specific HR needs. The results are lower costs, more empowered employees and more strategic benefit departments.

To date, more than 50 Aon clients have successfully implemented Employease to manage HR and benefits processes. Aon will now roll out the Employease solution to a broader audience.

Phil Fauver, chief executive officer of Employease, said, "There is an enormous opportunity to strategically manage and improve HR and benefits outsourcing. Aon is positioned to become a leader in the market, as employers rely on Aon to be a trusted business partner who can provide innovative and proven solutions that enhance productivity, reduce costs and improve service to employees. Aon expertise combined with Employease technology creates a powerful and compelling solution to service clients in a world-class fashion."

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. The company employs approximately 48,000 professionals in its 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.

Aon Consulting is among the top global human resources consulting firms, with 2003 revenues of $1.247 billion and 7,500 professionals in 120 offices throughout the world. Aon Consulting delivers integrated consulting solutions to help clients with employee benefits, human resources outsourcing, compensation, communication and management consulting.

About Employease, Inc.

Employease, Inc. ( http://www.employease.com/ ) provides an innovative and proven mix of web-based HR and benefits solutions and outsourcing options, giving organizations the power to choose how to best manage HR and benefits processes. By focusing on people, not paper, more than 1,000 organizations improve service to employees and managers and positively impact their bottom line using Employease. Employease and the Employease logo are registered trademarks and Employease Network is a trademark of Employease, Inc. All other trade marks are property of their respective owners.

   For more information, contact:
   Dana Sohn, Aon Consulting, +1.312.381.4786, dana_sohn@aon.com
   or
   Jasen Williams, Employease, Inc., +1.770.325.7814,
   jwilliams@employease.com

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, 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 regulatory investigations brought by state attorneys general and state insurance regulators related to our compensation arrangements with underwriters and related issues, the impact of class actions and individual lawsuits including derivative actions and claims under ERISA, 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.

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SOURCE: Aon Corporation

CONTACT: Dana Sohn of Aon Consulting, +1-312-381-4786,
dana_sohn@aon.com , or Jasen Williams of Employease, Inc., +1-770-325-7814,
jwilliams@employease.com

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