Aon Announces Pricing by Subsidiary of Offering of Euro 500 Million of Its 6.25%...

Aon Announces Pricing by Subsidiary of Offering of Euro 500 Million of Its
6.25% Guaranteed Notes Due July 1, 2014

CHICAGO, June 24 /PRNewswire-FirstCall/ -- Aon Corporation (NYSE: AOC) ("Aon")
announced today the pricing by its indirect, wholly-owned subsidiary Aon
Financial Services Luxembourg, S.A. (the "Issuer") of the Issuer's offering of
euro 500 million of its 6.25% Guaranteed Notes due July 1, 2014 (the "Notes").
Aon will unconditionally and irrevocably guarantee the payment of the
principal and interest in respect of the Notes.

The Notes will be submitted for acceptance by the Luxembourg Stock Exchange
(the "Exchange") for the purpose of listing the Notes on the official list of
the Exchange and trading the Notes on the Exchange's Euro MTF Market.

The Company intends to use the net proceeds from the sale of the Notes for its
general corporate purposes, including using a portion of the proceeds to repay
all of its outstanding borrowings under its euro 650 million multi-currency
revolving loan credit facility, which as of June 23, 2009 are approximately
euro 482 million and have a floating daily interest rate that was
approximately 1.2% as of the close of business on June 23, 2009.

The closing of the sale of the Notes is subject to customary conditions. In
addition, the Notes have not been, and will not be, registered under the
United States Securities Act of 1933, as amended (the "Securities Act"). The
Notes have been offered for sale exclusively outside the United States to
non−U.S. investors in the non−U.S. capital markets in accordance with
Regulation S under the Securities Act, and may not be offered, sold or
delivered within the United States or to or for the account or benefit of U.S.
persons except pursuant to an exemption from or in a transaction not subject
to the registration requirements of the Securities Act. This press release
does not constitute an offer to sell or the solicitation of an offer to buy
any of the Notes, nor shall there be any sale of the Notes, in any
jurisdiction in which such offer, solicitation or sale would be unlawful prior
to registration or qualification under the securities laws of such
jurisdiction.

About Aon
Aon Corporation (NYSE: AOC) is the leading global provider of risk management
services, insurance and reinsurance brokerage, and human capital consulting.
Through its more than 37,000 colleagues worldwide, Aon readily delivers
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 through more than 500 offices in
more than 120 countries. Named the world's best broker by Euromoney magazine's
2008 and 2009 Insurance Survey, Aon also ranked highest on Business
Insurance's listing of the world's largest insurance brokers based on
commercial retail, wholesale, reinsurance and personal lines brokerage
revenues in 2008. A.M. Best deemed Aon the number one insurance broker based
on brokerage revenues in 2007 and 2008, and Aon was voted best insurance
intermediary, best reinsurance intermediary and best employee benefits
consulting firm in 2007 and 2008 by the readers of Business Insurance. For
more information on Aon, log onto http://www.aon.com/.

Safe Harbor Statement
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, changes in commercial property and casualty markets and commercial
premium rates that could impact revenues, the outcome of inquiries from
regulators and investigations related to compliance with the U.S. Foreign
Corrupt Practices Act and non-U.S. anti-corruption laws, the impact of
investigations brought by U.S. state attorneys general, U.S. state insurance
regulators, U.S. federal prosecutors, U.S. federal regulators, and regulatory
authorities in the U.K. and other countries, the impact of class actions and
individual lawsuits including client class actions, securities class actions,
derivative actions, ERISA class actions, the cost of resolution of other
contingent liabilities and loss contingencies, our ability to integrate
Benfield successfully and to realize the anticipated benefits of the Benfield
merger. 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.

Investor Contact:
Scott Malchow
Vice President, Investor Relations
312-381-3983

Media Contact:
David Prosperi
Vice President, Global Public Relations
312-381-2485

SOURCE Aon Corporation

Investors, Scott Malchow, Vice President, Investor Relations, +1-312-381-3983,
or Media, David Prosperi, Vice President, Global Public Relations,
+1-312-381-2485, both of Aon Corporation