Two Aon Executives Honored as "Women to Watch" by Business Insurance

ROTTERDAM, The Netherlands, December 8, 2010 - Aon Corporation (NYSE: AON) today announced that two executives have been
named to Business Insurance magazine's 2010 "Women to Watch" list: Maggie
Westdale, chief financial officer and chief operating officer of Aon Benfield
and Marguerite Soeteman-Reijnen, chief broking officer for Europe, Middle
East and Africa at Aon Risk Solutions. An Aon leader has been named to the
"Women to Watch" list each year since the awards were launched in 2006.

Business Insurance's annual "Women to Watch" feature highlights an elite
group of 25 women who are doing outstanding work in commercial insurance,
reinsurance, risk management, employee benefits and related fields. A panel
of the magazine's senior editors selected this year's honorees based on their
recent professional achievements, influence on the marketplace and
contributions to the advancement of women in business.

As chief financial officer and chief operating officer of Aon Benfield,
the world's premier reinsurance intermediary and capital advisor, Westdale is
responsible for the financial results of the business, with a focus on
operational implications. She played a key role in the 2009 merger of Aon Re
and Benfield Group and has been instrumental in improving how Aon Benfield
measures and reports performance globally. Westdale has held numerous
leadership roles throughout her career, including senior vice president of
Corporate Financial Planning and Analysis at CNA, one of the largest
commercial and property and casualty insurers in the U.S.

As chief broking officer for Europe, Middle East and Africa at Aon Risk
Solutions, the worldwide leader in risk management and insurance broking,
Soeteman-Reijnen oversees 30 national and two regional broking operations
that focus on providing innovative broking products and solutions to Aon's
global client base. Based on her success in the region, the chief broking
officer role was established in additional regions in December 2009 as part
of Aon Risk Solutions' new global broking strategy. Prior to her current
role, Soeteman-Reijnen held several senior management positions at Aon,
including managing director and head of origination for Aon Capital Markets
in EMEA.

"The strength of Aon lies with our people, and Maggie and Marguerite
excel at what Aon does best - understanding our clients' distinct needs and
offering innovative thinking and solutions that address today's unique risk
and people challenges," said Greg Case, president and chief executive officer
of Aon. "We congratulate them on earning this prestigious award and thank
them for their important contributions to our business, our clients and the
industry."

A complete list of the 2010 Business Insurance "Women to Watch" winners
can be found by visiting:
www.businessinsurance.com/apps/pbcs.dll/section?Category=awards05&date=20101205.

(Due to the length of this URL, it may be necessary to copy and paste
this hyperlink into your Internet browser's URL address field. Remove the
space if one exists.)

About Aon

Aon Corporation (NYSE:AON) is the leading global provider of risk
management services, insurance and reinsurance brokerage, and human resource
consulting and outsourcing. Through its more than 59,000 colleagues
worldwide, Aon unites to deliver distinctive client value via innovative and
effective risk management and workforce productivity solutions. Aon's
industry-leading global resources and technical expertise are delivered
locally in over 120 countries. Named the world's best broker by Euromoney
magazine's 2008, 2009 and 2010 Insurance Survey, Aon also ranked highest on
Business Insurance's listing of the world's insurance brokers based on
commercial retail, wholesale, reinsurance and personal lines brokerage
revenues in 2008 and 2009. A.M. Best deemed Aon the number one insurance
broker based on revenues in 2007, 2008 and 2009, and Aon was voted best
insurance intermediary 2007-2010, best reinsurance intermediary 2006-2010,
best captives manager 2009-2010, and best employee benefits consulting firm
2007-2009 by the readers of Business Insurance. Visit www.aon.com for
more information on Aon and www.aon.com/unitedin2010 to learn about
Aon's global partnership and shirt sponsorship with Manchester United.

Note to editors: Photos available upon request

Media Contact: Maurissa Kanter, +1-847-442-0952, maurissa.kanter at aon.com