Document:

QuickLinks
 -- Click here to rapidly navigate through this document

 
 

Exhibit 10(z)    
    

FORM OF SEVERANCE AGREEMENT  

        Aon Corporation has entered into the following Severance Agreement with eleven senior executives, including four of the named executive officers (David P. Bolger,
Donald C. Ingram, Dennis L. Mahoney and Dick P.M. Verbeek) to be listed in the proxy statement for the 2005 annual meeting of stockholders and one named executive officer (Michael D. O'Halleran)
listed in the proxy statement for the 2004 annual meeting of stockholders. The individual Severance Agreements are identical to the form of Severance Agreement, with the exception of the name of the
Executive party to the Agreement and in the case of Messrs. Mahoney and Verbeek, who are not U.S. executives, the agreements will be modified to comply with local tax and other laws. 

SEVERANCE AGREEMENT  

        This Agreement is entered into as of January 21, 2005 between Aon Corporation, a Delaware corporation,
and                        (the "Executive"). 

        WHEREAS,
the Executive currently serves as a key employee of the Company (as defined in Section 1) and the Executive's services and knowledge are valuable to the Company in
connection with the management of one or more of the Company's principal operating facilities, divisions, departments or subsidiaries; and 

        WHEREAS,
the Board (as defined in Section 1) has determined that it is in the best interests of the Company and its stockholders to secure the Executive's continued services and
to ensure the Executive's continued dedication and objectivity in the event of any threat or occurrence of, or negotiation or other action that could lead to, or create the possibility of, a Change in
Control (as defined in Section 1) of the Company, without concern as to whether the Executive might be hindered or distracted by personal uncertainties and risks created by any such possible
Change in Control, and to encourage the Executive's full attention and dedication to the Company, the Board has authorized the Company to enter into this Agreement. 

        NOW,
THEREFORE, in consideration of the premises and the mutual covenants and agreements herein contained, the Company and the Executive hereby agree as follows: 

        1.    Definitions.    As used in this Agreement, the following terms shall have the respective meanings set forth
below: 

        (a)   "Board"
means the Board of Directors of the Company. 

        (b)   "Cause"
means: 

        (1)   a
material breach by the Executive of those duties and responsibilities of the Executive which do not differ in any material respect from the duties and responsibilities
of the Executive during the 90-day period immediately prior to a Change in Control (other than as a result of incapacity due to physical or mental illness) which is demonstrably willful
and deliberate on the Executive's part, which is committed in bad faith or without reasonable belief that such breach is in the best interests of the Company and which is not remedied in a reasonable
period of time after receipt of written notice from the Company specifying such breach; 

        (2)   Gross
misconduct, theft, fraud, breach of trust or any act of dishonesty by the Executive which results in material harm to the Company; or 

        (3)   the
commission by the Executive of a felony involving moral turpitude. 

        (c)   "Change
in Control" means: 

        (1)   the
acquisition by any individual, entity or group (a "Person"), including any "person" within the meaning of Section 13(d)(3) or 14(d)(2) of the Securities
Exchange Act of 1934, as amended (the "Exchange Act"), of beneficial ownership (within the meaning of Rule 13d-3 promulgated under the Exchange Act) of 30% or more of either
(i) the then outstanding shares of common stock of the Company (the "Outstanding Common Stock") or (ii) the combined voting power of the then outstanding securities of the Company
entitled to vote generally in the election of directors (the "Outstanding Voting Securities"); excluding, however, the following: (A) any acquisition directly from the Company (excluding any
acquisition resulting from the exercise of an exercise, conversion or exchange privilege unless the security 

 

being
so exercised, converted or exchanged was acquired directly from the Company), (B) any acquisition by the Company, (C) any acquisition by an employee benefit plan (or related trust)
sponsored or maintained by the Company or any corporation controlled by the Company, or (D) any acquisition by any corporation pursuant to a transaction which complies with clauses (i),
(ii) and (iii) of subsection (3) of this Section 1(c); provided further, that for purposes of clause (B), if any Person (other than the Company or any employee
benefit plan (or related trust) sponsored or maintained by the Company or any corporation controlled by the Company) shall become the beneficial owner of 30% or more of the Outstanding Common Stock or
30% or more of the Outstanding Voting Securities by reason of an acquisition by the Company, and such Person shall, after such acquisition by the Company, become the beneficial owner of any additional
shares of the Outstanding Common Stock or any additional Outstanding Voting Securities and such beneficial ownership is publicly announced, such additional beneficial ownership shall constitute a
Change in Control; 

        (2)   individuals
who, as of the date hereof, constitute the Board (the "Incumbent Board") cease for any reason to constitute at least a majority of such Board; provided that
any individual who becomes a director of the Company subsequent to the date hereof whose election, or nomination for election by the Company's stockholders, was approved by the vote of at least a
majority of the directors then comprising the Incumbent Board shall be deemed a member of the Incumbent Board; and provided further, that any individual who was initially elected as a director of the
Company as a result of an actual or threatened solicitation by a Person other than the Board for the purpose of opposing a solicitation by any other Person with respect to the election or removal of
directors, or any other actual or threatened solicitation of proxies or consents by or on behalf of any Person other than the Board shall not be deemed a member of the Incumbent Board; 

        (3)   the
consummation of a reorganization, merger or consolidation or sale or other disposition of all or substantially all of the assets of the Company (a "Corporate
Transaction"); excluding, however, a Corporate Transaction pursuant to which (i) all or substantially all of the individuals or entities who are the beneficial owners, respectively, of the
Outstanding Common Stock and the Outstanding Voting Securities immediately prior to such Corporate Transaction will beneficially own, directly or indirectly, more than 60% of, respectively, the
outstanding shares of common stock, and the combined voting power of the outstanding securities entitled to vote generally in the election of directors, as the case may be, of the corporation
resulting from such Corporate Transaction (including, without limitation, a corporation which as a result of such transaction owns the Company or all or substantially all of the Company's assets
either directly or indirectly) in substantially the same proportions relative to each other as their ownership, immediately prior to such Corporate Transaction, of the Outstanding Common Stock and the
Outstanding Voting Securities, as the case may be, (ii) no Person (other than: the Company; any employee benefit plan (or related trust) sponsored or maintained by the Company or any
corporation controlled by the Company; the corporation resulting from such Corporate Transaction; and any Person which beneficially owned, immediately prior to such Corporate Transaction, directly or
indirectly, 30% or more of the Outstanding Common Stock or the Outstanding Voting Securities, as the case may be) will beneficially own, directly or indirectly, 30% or more of, respectively, the
outstanding shares of common stock of the corporation resulting from such Corporate Transaction or the combined voting power of the outstanding securities of such corporation entitled to vote
generally in the election of directors and (iii) individuals who were members of the Incumbent Board will constitute at least a majority of the members of the board of directors of the
corporation resulting from such Corporate Transaction; or 

        (4)   the
consummation of a plan of complete liquidation or dissolution of the Company. 

        (d)   "Code"
means the Internal Revenue Code of 1986, as amended. 

        (e)   "Company"
means Aon Corporation, a Delaware corporation. 

2

 

        (f)    "Good
Reason" means, without the Executive's express written consent, the occurrence of any of the following events after a Change in Control: 

        (1)   a
material adverse change in the nature or scope of the Executive's authority, powers, functions, duties or responsibilities as in effect immediately prior to such
Change in Control; 

        (2)   a
material reduction by the Company in the Executive's rate of annual base salary or bonus opportunity as in effect immediately prior to such Change in Control or as the
same may be increased from time to time thereafter; 

        (3)   the
failure of the Company to continue in effect any material employee benefit plan or compensation plan in which the Executive is participating immediately prior to
such Change in Control, unless the Executive is permitted to participate in other plans providing the Executive with substantially comparable benefits, or the taking of any action by the Company which
would adversely affect the Executive's participation in or materially reduce the Executive's benefits under any such plan; 

        (4)   a
change in the Executive's primary employment location to a location that is more than 50 miles from the primary location of the Executive's employment at the time of
such Change in Control; or 

        (5)   the
failure of the Company to obtain from any successor or transferee of the Company an express written and unconditional assumption of the Company's obligations under
this Agreement, as further described in Section 12(b) of this Agreement. 

        For
purposes of this Agreement, any good faith determination of Good Reason made by the Executive shall be conclusive; provided, however,
that an isolated, insubstantial and inadvertent action taken in good faith and which is remedied by the Company promptly after receipt of notice thereof given by the Executive shall not constitute
Good Reason. 

        (g)   "Nonqualifying
Termination" means a termination of the Executive's employment (1) by the Company for Cause, (2) by the Executive for any reason other than
a Good Reason, (3) as a result of the Executive's death or (4) by the Company due to the Executive's absence from the Executive's duties with the Company on a full-time basis
for at least 180 consecutive days as a result of the Executive's incapacity due to physical or mental illness. 

        (h)   "Termination
Date" means the date during the Termination Period on which the Executive's employment is terminated other than by reason of a Nonqualifying Termination. 

        (i)    "Termination
Period" means the period of time beginning with a Change in Control and ending on the earlier to occur of (1) the date which is two (2) years
following such Change in Control and (2) the Executive's death; provided, however, that, anything in this Agreement to the contrary notwithstanding, if a Change in Control occurs and if the
Executive's employment with the Company was terminated prior to the date on which the Change in Control occurs, and if it is reasonably demonstrated by the Executive that such termination of
employment (a) was at the request of a third party who was taking steps reasonably calculated to effect a Change in Control or (b) otherwise arose in connection with or in anticipation
of a Change in Control, then for purposes of this Agreement, "Termination Period" means the period of time commencing upon the date immediately prior to the date of such termination of employment and
ending on the earlier to occur of (x) two (2) years following such Change in Control and (y) the Executive's death. 

        2.    Obligations of the Executive.    The Executive agrees that in the event any person or group attempts a Change in
Control, he shall not voluntarily leave the employ of the Company without Good Reason (a) until such attempted Change in Control terminates or (b) if a Change in Control shall occur,
until 90 days following such Change in Control. 

        3.    Payments and Benefits Upon Termination of Employment.    If during the Termination Period the employment of the
Executive shall terminate, other than by reason of a Nonqualifying Termination, and the Executive (or the Executive's executor or other legal representative in the case of the Executive's death or
disability following such termination) executes a noncompetition, nonsolicitation and confidentiality agreement substantially in the form of Exhibit A hereto (the "Noncompetition Agreement")
within 60 days following the Termination Date, the Company shall provide to the 

3

 

Executive,
as compensation for services rendered to the Company, and in consideration of the covenants set forth in the Noncompetition Agreement, the payments and benefits described in this
Section 3. Notwithstanding the foregoing provisions of this Section 3, if as a result of the Executive's termination of employment on the Termination Date the Executive is entitled to
severance payments and benefits, which benefits may, without limitation, include enhanced supplemental pension benefits conferred or equity awards granted as a result of termination of employment,
from the Company or any of its subsidiaries which are not payable pursuant to this Agreement, but are payable pursuant to an employment agreement or other compensation arrangement entered into between
the Executive and the Company or any of its subsidiaries ("Alternative Severance Payments and Benefits"), the Executive shall have no right to any payments or benefits pursuant to this
Section 3 unless (i) the Executive (or the Executive's executor or other legal representative in the case of the Executive's death or disability following such termination) executes the
Noncompetition Agreement and a release in the form of Exhibit B hereto (the "Release of Severance Payments and Benefits") within 60 days following the Termination Date releasing all
rights to the Alternative Severance Payments and Benefits, other than rights to Alternative Equity Vesting (as defined in Section 4 hereof), and has not revoked the Release of Severance
Payments and Benefits and (ii) the payments and benefits to be received by the Executive pursuant to this Section 3 are reduced by the amount of the Alternative Severance Payments and
Benefits, if any, previously received by the Executive. 

        (a)   The
Company shall pay to the Executive (or the Executive's beneficiary or estate, as the case may be) within 30 days following the date of execution of the
Noncompetition Agreement and, if applicable, the Release of Severance Payments and Benefits: 

        (1)   a
cash amount (subject to any applicable payroll or other taxes required to be withheld pursuant to Section 7 and any deductions authorized by the Executive)
equal to the sum of (i) the Executive's full annual base salary from the Company and its affiliated companies through the Termination Date, to the extent not theretofore paid, (ii) the
average of the Executive's annual cash incentive for each of the three fiscal years immediately preceding the fiscal year in which the Termination Date occurs, multiplied by a fraction, the numerator
of which is the number of days in the fiscal year in which the Termination Date occurs and the denominator of which is 365 or 366, as applicable, and (iii) any accrued vacation pay, in each
case to the extent not theretofore paid; plus 

        (2)   a
lump sum cash amount (subject to any applicable payroll or other taxes required to be withheld pursuant to Section 7 and any deductions authorized by the
Executive) in an amount equal to three (3) times the Executive's highest annual base salary from the Company and its affiliated companies in effect during the 12-month period prior
to the Termination Date; plus 

        (3)   a
lump sum cash amount (subject to any applicable payroll or other taxes required to be withheld pursuant to Section 7 and any deductions authorized by the
Executive) in an amount equal to the amount forfeited by the Executive under any qualified defined contribution plan maintained by the Company or any of its subsidiaries as a result of the Executive's
termination of employment. 

        (b)   The
Executive shall become fully (100%) vested in the Executive's accrued benefits under the Aon Corporation Excess Benefit Plan, the Aon Corporation Supplemental
Savings Plan and the Aon Corporation Supplemental Employee Stock Ownership Plan, or successor plans in effect on the date of the Executive's termination of employment (the "Nonqualified Plans"). The
Executive's accrued benefits under the Aon Corporation Excess Benefit Plan or the Aon Corporation Supplemental Savings Plan, whichever plan is applicable to the Executive on the date of the
Executive's termination of employment, shall be determined by crediting the Executive with three (3) additional years of age and service credits and, in the case of the Aon Corporation
Supplemental Savings Plan, three (3) additional years of Retirement Plan Contributions. Within 30 days following the Termination Date, the Company shall pay to the Executive a lump sum
cash amount equal to the actuarial equivalent of the Executive's accrued benefits under the Nonqualified Plans, determined as of the Executive's Termination Date, notwithstanding anything contained in
the Nonqualified Plans to the contrary. Such lump sum cash payment shall be computed in the case of the Aon Corporation Excess Benefit Plan using the same actuarial assumptions then in use for 

4

 

purposes
of computing benefits under plan, provided that the interest rate used in making such computations shall not be greater than the interest rate permitted under section 417(c) of the
Code on the date of the Change in Control. 

        (c)   For
the period commencing on the Termination Date and ending on the earlier of (i) the date which is three (3) years following the Termination Date and
(ii) the date on which the Executive becomes eligible to participate in and receive medical, dental and life insurance benefits under a plan or arrangement sponsored by another employer having
benefits substantially equivalent to the benefits provided pursuant to this Section 3(c), the Company shall continue the Executive's medical, dental and life insurance coverage, under the
Company-sponsored plans or otherwise, upon the same terms and otherwise to the same extent as such coverage shall have been in effect immediately prior to the Executive's Termination Date, and the
Company and the Executive shall share the costs of the continuation of such medical, dental and life insurance coverage in the same proportion as such costs were shared immediately prior to the
Termination Date. Such
continuation of medical and dental coverage shall be in satisfaction of the Company's obligations under the Consolidated Omnibus Budget Reconciliation Act of 1985 (COBRA). 

        4.    Vesting of Equity Awards Upon Termination Date; Exercise Period.    Immediately upon the Executive's Termination
Date, all stock options and other equity awards, if any, granted by the Company to the Executive (or stock options and other equity awards granted in substitution therefor by an acquiror of, or
successor to, the Company) that are not otherwise exercisable or vested shall become exercisable and vested in full. With respect to any and all outstanding stock options granted by the Company to the
Executive, each such option shall remain exercisable following the Executive's termination of employment until and including the expiration date of the term of the option (as set forth in the written
agreement relating to such option). Notwithstanding the foregoing provisions of this Section 4, if as a result of the Executive's termination of employment on the Termination Date the Executive
is entitled to the acceleration of exercisability of stock options or the vesting of other equity awards granted by the Company to the Executive (or stock options or other equity awards granted in
substitution therefor by an acquiror of, or successor to, the Company), which acceleration or vesting is not pursuant to this Agreement, but is pursuant to an employment agreement or other
compensation arrangement entered into between the Executive and the Company or any of its subsidiaries ("Alternative Equity Vesting"), the Executive shall have no rights pursuant to this
Section 4 unless the Executive (or the Executive's executor or other legal representative in the case of the Executive's death or disability following such termination) executes the
Noncompetition Agreement and a release in the form of Exhibit C hereto (the "Release of Exercisability and Vesting") within 60 days following the Termination Date releasing all rights to
the Alternative Equity Vesting, and has not revoked the Release of Exercisability and Vesting. 

        5.    Certain Additional Payments by the Company.    (a) If the Executive is entitled to receive payments and
benefits under Section 3 hereof or vesting of equity awards under Section 4 hereof, anything in this Agreement to the contrary notwithstanding, in the event it shall be determined that
any payment or distribution by the Company or its affiliated companies to or for the benefit of the Executive (whether paid or payable or distributed or distributable pursuant to the terms of this
Agreement or otherwise, but determined without regard to any additional payments required under this Section 5) (a "Payment") would be subject to the excise tax imposed by Section 4999
of the Code, or any interest or penalties are incurred by the Executive with respect to such excise tax (such excise tax, together with any such interest and penalties, are hereinafter collectively
referred to as the "Excise Tax"), then the Executive shall be entitled to receive an additional payment (a "Gross-Up Payment") in an amount such that after payment by the Executive of all
taxes (including any interest or penalties imposed with respect to such taxes), including, without limitation, any income taxes (and any interest and penalties imposed with respect thereto) and Excise
Tax imposed upon the Gross-Up Payment, the Executive retains an amount of the Gross-Up Payment equal to the Excise Tax imposed upon the Payments. 

        (b)   Subject
to the provisions of Section 5(c), all determinations required to be made under this Section 5, including whether and when a Gross-Up
Payment is required and the amount of such Gross-Up Payment and the assumptions to be utilized in arriving at such determination, shall be made by the Company's public accounting firm (the
"Accounting Firm") which shall provide detailed supporting calculations both to the Company and the Executive within 15 business days of 

5

 

the
receipt of notice from the Executive that there has been a Payment, or such earlier time as is requested by the Company. In the event that the Accounting Firm is serving as accountant or auditor
for the individual, entity or group effecting the Change in Control, the Executive shall appoint another nationally recognized public accounting firm to make the determinations required hereunder
(which accounting firm shall then be referred to as the Accounting Firm hereunder). All fees and expenses of the Accounting Firm shall be borne solely by the Company. Any Gross-Up Payment,
as determined pursuant to this Section 5, shall be paid by the Company to the Executive within five days of the receipt of the Accounting Firm's determination. If the Accounting Firm determines
that no Excise Tax is payable by the Executive, it shall furnish the Executive with a written opinion that failure to report the Excise Tax on the Executive's applicable federal income tax return
would not result in the imposition of a negligence or similar penalty. Any determination by the Accounting Firm shall be binding upon the Company and the Executive. As a result of the uncertainty in
the application of Section 4999 of the Code at the time of the initial determination by the Accounting Firm hereunder, it is possible that Gross-Up Payments which will not have been
made by the Company should have been made ("Underpayment"), consistent with the calculations required to be made hereunder. In the event that the Company exhausts its remedies pursuant to
Section 5(c) and the Executive thereafter is required to make a payment of any Excise Tax, the Accounting Firm shall determine the amount of the Underpayment that has occurred and any such
Underpayment shall be promptly paid by the Company to or for the benefit of the Executive. 

        (c)   The
Executive shall notify the Company in writing of any claim by the Internal Revenue Service that, if successful, would require the payment by the Company of the
Gross-Up Payment. Such notification shall be given as soon as practicable but no later than 10 business days after the Executive is informed in writing of such claim and shall apprise the
Company of the nature of such claim and the date on which such claim is requested to be paid. The Executive shall not pay such claim prior to the expiration of the 30-day period following
the date on which the Executive gives such notice to the Company (or such shorter period ending on the date that any payment of taxes with respect to such claim is due). If the Company notifies the
Executive in writing prior to the expiration of such period that it desires to contest such claim, the Executive shall: 

        (1)   give
the Company any information reasonably requested by the Company relating to such claim; 

        (2)   take
such action in connection with contesting such claim as the Company shall reasonably request in writing from time to time, including, without limitation, accepting
legal representation with respect to such claim by an attorney reasonably selected by the Company; 

        (3)   cooperate
with the Company in good faith in order effectively to contest such claim; and 

        (4)   permit
the Company to participate in any proceedings relating to such claim; 

provided, however, that the Company shall bear and pay directly all costs and expenses (including
additional interest and penalties) incurred in connection with such contest and shall indemnify and hold the Executive harmless, on an after-tax basis, for any Excise Tax or income tax
(including interest and penalties with respect thereto) imposed as a result of such representation and payment of costs and expenses. Without limitation on the foregoing provisions of this
Section 5(c), the Company shall control all proceedings taken in connection with such contest and, at its sole option, may pursue or forgo any and all administrative appeals, proceedings,
hearings and conferences with the taxing authority in respect of such claim and may, at its sole option, either direct the Executive to pay the tax claimed and sue for a refund or contest the claim in
any permissible manner, and the Executive agrees to prosecute such contest to a determination before any administrative tribunal, in a court of initial jurisdiction and in one or more appellate
courts, as the Company shall determine; provided further, that if the Company directs the Executive to pay such claim and sue for a refund, the Company
shall advance the amount of such payment to the Executive on an interest-free basis and shall indemnify and hold the Executive harmless, on an after-tax basis, from any Excise
Tax or income tax (including interest or penalties with respect thereto) imposed with respect to such advance or with respect to any imputed income with respect to such advance; and  provided further,
that any extension of the statute of limitations relating to payment of taxes for the taxable year of the Executive with respect to
which such contested amount is claimed to be due is limited solely to such contested amount. Furthermore, the Company's control of the contest shall 

6

 

be
limited to issues with respect to which a Gross-Up Payment would be payable hereunder and the Executive shall be entitled to settle or contest, as the case may be, any other issue
raised by the Internal Revenue Service or any other taxing authority. 

        (d)   If,
after the receipt by the Executive of an amount advanced by the Company pursuant to Section 5(c), the Executive becomes entitled to receive, and receives, any
refund with respect to such claim, the Executive shall (subject to the Company's complying with the requirements of Section 5(c)) promptly pay to the Company the amount of such refund (together
with any interest paid or credited thereon after taxes applicable thereto). If, after the receipt by the Executive of an amount advanced by the Company pursuant to Section 5(c), a determination
is made that the Executive shall not be entitled to any refund with respect to such claim and the Company does not notify the Executive in writing of its intent to contest such denial of refund prior
to the expiration of 30 days after such determination, then such advance shall be forgiven and shall not be required to be repaid and the amount of such advance shall offset, to the extent
thereof, the amount of Gross-Up Payment required to be paid. 

        6.    Delay of Payments.    In the event that any payment or distribution to be made to the Executive hereunder is
determined to constitute "deferred compensation" subject to Section 409A of the Code, and the Executive is determined to be a "specified employee" (as defined in Section 409A of the
Code), such payment or distribution shall not be made before the date which is six months after the termination of the Executive's employment (or, if earlier, the date of the Executive's death). 

        7.    Withholding Taxes.    The Company may withhold from all payments due to the Executive (or the Executive's
beneficiary or estate) hereunder all taxes which, by applicable federal, state, local or other law, the Company is required to withhold therefrom. 

        8.    Reimbursement of Expenses; Interest on Late Payments.    

        (a)   If
any contest or dispute shall arise under this Agreement involving termination of the Executive's employment with the Company or involving the failure or refusal of
the Company to perform fully in accordance with the terms hereof, the Company shall reimburse the Executive, on a current basis, for all legal fees and expenses, if any, incurred by the Executive in
connection with such contest or dispute, together with interest thereon at a rate equal to the prime rate, as published under "Money Rates" in The Wall Street
Journal from time to time plus 300 basis points, but in no event higher than the maximum legal rate permissible under applicable law (the "Interest Rate"), such interest to
accrue from the date the Company receives the Executive's written statement for such fees and expenses through the date of payment thereof; provided,  however, that in the event the resolution of any such contest or dispute includes a finding denying, in total, the Executive's claims in such contest or
dispute, the Executive shall be required to reimburse the Company, over a period of 12 months from the date of such resolution, for all sums advanced to the Executive pursuant to this
Section 8. 

        (b)   With
respect to any and all payments that are required to be made by the Company to the Executive pursuant to this Agreement and that are not made within the time period
specified herein, the Company shall pay to the Executive interest on such payments at the Interest Rate. Such interest shall accrue from the due date of the required payment through the date on which
such payment is made to the Executive. 

        9.    Operative Event.    No amounts shall be payable hereunder unless and until there is a Change in Control. 

        10.    Termination of Agreement.    (a) This Agreement shall be effective on the date hereof and shall
continue until terminated by the Company as provided in Section 10(b); provided, however, that
this Agreement shall terminate in any event upon the earlier to occur of (1) termination of the Executive's employment with the Company prior to a Change in Control and (2) the
Executive's death. 

        (b)   The
Company shall have the right prior to a Change in Control, in its sole discretion, pursuant to action by the Board, to approve the termination of this Agreement,
which termination shall not become effective until the date fixed by the Board for such termination, which date shall be at least 120 days after notice thereof is given by the Company to the
Executive in accordance with Section 13; provided, however, that no such action shall be taken by the Board during any 

7

 

period
of time when the Board has knowledge that any person has taken steps reasonably calculated to effect a Change in Control until, in the opinion of the Board, such person has abandoned or
terminated its efforts to effect a Change in Control; and provided further, that in no event shall this Agreement be terminated in the event of a Change
in Control. In the event that this Agreement is determined to be a "deferred compensation plan" subject to Section 409A of the Code, the Company, pursuant to action by the Board, shall, as
necessary, adopt such conforming amendments as are necessary to comply with Section 409A of the Code without reducing the payments and benefits due to the Executive hereunder. 

        11.    Scope of Agreement.    Nothing in this Agreement shall be deemed to entitle the Executive to continued
employment with the Company or its subsidiaries and, subject to Section 2 hereof, if the Executive's employment with the Company shall terminate prior to a Change in Control, then the Executive
shall have no further rights under this Agreement; provided, however, that any termination of the Executive's employment following a Change in Control
shall be subject to all of the provisions of this Agreement. 

        12.    Successors; Binding Agreement.    

        (a)   This
Agreement shall not be terminated by any merger or consolidation of the Company whereby the Company is or is not the surviving or resulting corporation or as a
result of any transfer of all or substantially all of the assets of the Company. In the event of any such merger, consolidation or transfer of assets, the provisions of this Agreement shall be binding
upon the surviving or resulting corporation or the person or entity to which such assets are transferred. 

        (b)   The
Company agrees that concurrently with any merger, consolidation or transfer of assets referred to in Section 12(a), it will cause any successor or transferee
unconditionally to assume, by written instrument delivered to the Executive (or the Executive's beneficiary or estate), all of the obligations of the Company hereunder. Failure of the Company to
obtain such assumption prior to the effectiveness of any such merger, consolidation or transfer of assets shall be a breach of this Agreement and shall entitle the Executive to compensation and other
benefits from the Company in the same amount and on the same terms as the Executive would be entitled hereunder if the Executive's employment were terminated following a Change in Control other than
by reason of a Nonqualifying Termination during the Termination Period. For purposes of implementing the foregoing, the date on which any such merger, consolidation or transfer becomes effective shall
be deemed the Date of Termination. 

        (c)   This
Agreement shall inure to the benefit of and be enforceable by the Executive's personal or legal representatives, executors, administrators, successors, heirs,
distributees, devisees and legatees. If the Executive shall die while any amounts would be payable to the Executive hereunder had the Executive continued to live, all such amounts, unless otherwise
provided herein, shall be paid in accordance with the terms of this Agreement to such person or persons appointed in writing by the Executive to receive such amounts or, if no person is so appointed,
to the Executive's estate. 

        13.    Notices.    (a) For purposes of this Agreement, all notices and other communications required or
permitted hereunder shall be in writing and shall be deemed to have been duly given when delivered or five days after deposit in the United States mail, certified and return receipt requested, postage
prepaid, addressed (1) if to the Executive, to                        , and if to the Company, to Aon Corporation, 200 East
Randolph Drive, Chicago, Illinois 60602, 3d Floor, attention General Counsel,
with a copy to the Secretary, or (2) to such other address as either party may have furnished to the other in writing in accordance herewith, except that notices of change of address shall be
effective only upon receipt. 

        (b)   A
written notice of the Executive's Termination Date by the Company or the Executive, as the case may be, to the other, shall (1) indicate the specific
termination provision in this Agreement relied upon, (2) to the extent applicable, set forth in reasonable detail the facts and circumstances claimed to provide a basis for termination of the
Executive's employment under the provision so indicated and (3) specify the termination date (which date shall be not less than 15 days after the giving of such notice). The failure by
the Executive or the Company to set forth in such notice any fact or circumstance which contributes to a showing of Good Reason or Cause shall not waive any 

8

 

right
of the Executive or the Company hereunder or preclude the Executive or the Company from asserting such fact or circumstance in enforcing the Executive's or the Company's rights hereunder. 

        14.    Full Settlement; Resolution of Disputes.    (a) The Company's obligation to make any payments provided
for in this Agreement and otherwise to perform its obligations hereunder shall not be affected by any set-off, counterclaim, recoupment, defense or other claim, right or action which the
Company may have against the Executive or others. In no event shall the Executive be obligated to seek other employment or take any other action by way of mitigation of the amounts payable to the
Executive under any of the provisions of this Agreement and, subject to Section 3(c) hereof, such amounts shall not be reduced whether or not the Executive obtains other employment. 

        (b)   If
there shall be any dispute between the Company and the Executive in the event of any termination of the Executive's employment, then, unless and until there is a
final, nonappealable judgment by a court of competent jurisdiction declaring that such termination was for Cause, that the determination by the Executive of the existence of Good Reason was not made
in good faith, or that the Company is not otherwise obligated to pay any amount or provide any benefit to the Executive and the Executive's dependents or other beneficiaries, as the case may be, under
Sections 3 and 4 hereof, the Company shall pay all amounts, and provide all benefits, to the Executive and the Executive's dependents or other beneficiaries, as the case may be, that the Company would
be required to pay or provide pursuant to Sections 3 and 4 hereof as though such termination were by the Company without Cause or by the Executive with Good Reason; provided,
however, that the Company shall not be required to pay any disputed amounts pursuant to this Section 14(b) except upon receipt of an undertaking by or on behalf of the
Executive to repay all such amounts to which the Executive is ultimately adjudged by such court not to be entitled. 

        15.    Employment with, and Action by, Subsidiaries.    For purposes of this Agreement, employment with the Company or
actions taken by the Company with respect to the Executive shall include employment with or actions taken by any corporation or other entity in which the Company has a direct or indirect ownership
interest of 50% or more of the total combined voting power of the then outstanding securities of such corporation or other entity entitled to vote generally in the election of directors. 

        16.    Governing Law; Validity.    The interpretation, construction and performance of this Agreement shall be
governed by and construed and enforced in accordance with the internal laws of the State of Illinois without regard to the principle of conflicts of laws. The invalidity or unenforceability of any
provision of this Agreement shall not affect the validity or enforceability of any other provisions of this Agreement, which other provisions shall remain in full force and effect. 

        17.    Counterparts.    This Agreement may be executed in two counterparts, each of which shall be deemed to be an
original and both of which together shall constitute one and the same instrument. 

        18.    Miscellaneous.    No provision of this Agreement may be modified or waived unless such modification or waiver
is agreed to in writing and signed by the Executive and by a duly authorized officer of the Company. No waiver by either party hereto at any time of any breach by the other party hereto of, or
compliance with, any condition or provision of this Agreement to be performed by such other party shall be deemed a waiver of similar or dissimilar provisions or conditions at the same or at any prior
or subsequent time. Failure by the Executive or the Company to insist upon strict compliance with any provision of this Agreement or to assert any right the Executive or the Company may have
hereunder, including, without limitation, the right of the Executive to terminate employment for Good Reason, shall not be deemed to be a waiver of such provision or right or any other provision or
right of this Agreement. Except as otherwise expressly set forth in this Agreement, the rights of, and benefits payable to, the Executive, the Executive's estate or the Executive's beneficiaries
pursuant to this Agreement are in addition to any rights of, or benefits payable to, the Executive, the Executive's estate or the Executive's beneficiaries under any other employee benefit plan or
compensation program of the Company. 

        IN
WITNESS WHEREOF, the Company has caused this Agreement to be executed by a duly authorized officer of the Company and the Executive has executed this Agreement as of the day and year
first above written. 

	

 	
 	

AON CORPORATION
	

 	
 	

By:	
 	

	

 	
 	

EXECUTIVE
	

 	
 	

  
 [Executive's Name]

9

  

 
 

EXHIBIT A
  TO AGREEMENT    
    

NONCOMPETITION, NONSOLICITATION

AND CONFIDENTIALITY AGREEMENT  

        This Noncompetition, Nonsolicitation and Confidentiality Agreement (this "Noncompetition Agreement") is executed by Aon Corporation, a Delaware corporation (the
"Company"), and                        (the "Executive") pursuant to Sections 3 and 4 of the Severance Agreement dated as of
January 21, 2005 between the Company and the Executive (the
"Agreement"). 

        WHEREAS,
the Executive's employment with the Company and its subsidiaries is terminating; 

        WHEREAS,
the Executive acknowledges that the benefits to be provided to the Executive under the Agreement are in consideration of, and are sufficient to support, the covenants set forth
in this Noncompetition Agreement; and 

        WHEREAS,
the Executive understands that the Company regards the representations and covenants by the Executive in this Noncompetition Agreement as material and that the Company is
relying on such representations and covenants in paying amounts to the Executive pursuant to the Agreement. 

        NOW,
THEREFORE, the Company and the Executive hereby agree as follows: 

        1.    Severance Benefits.    The Executive's employment with the Company and its subsidiaries shall terminate on
            , and the Executive shall receive the severance benefits set forth in the Agreement in accordance with the terms and subject to the conditions thereof. 

        2.    Noncompetition;
Nonsolicitation.    (a) General.    The Executive acknowledges that in the course of the Executive's
employment with the Company the Executive has become familiar with trade secrets and other confidential information concerning the Company and its subsidiaries, including Aon Group, Inc., a
Maryland corporation ("Aon Group"), and that the Executive's services were of special, unique and extraordinary value to the Company and its affiliates. 

        (b)    Noncompetition.    The Executive agrees that during the period commencing on the Executive's Termination Date
(as defined in the Agreement) and ending on the date which is two years following the Executive's Termination Date (the "Noncompetition Period"), the Executive shall not in any manner engage in
Competitive Activity in any Restricted Area. For purposes of this Agreement, "Competitive Activity" means engaging (directly or indirectly, through any person, firm, corporation or enterprise, either
alone or as a member of a partnership or as an officer, director, stockholder, investor or employee of or consultant to any other firm, corporation or enterprise or otherwise) or assisting any other
person, firm, corporation or enterprise in engaging in any Business of the Company or any of its subsidiaries, including Aon Group (collectively, the "Protected Parties"), if the Business was being
conducted by or contemplated by any of the Protected Parties as of the Executive's Termination Date. For purposes of this Agreement, "Business" includes, but is not limited to, the following: the
provision of conventional and alternative risk management products; the performance of services in the businesses of insurance brokerage, reinsurance brokerage, benefits consulting, compensation
consulting, human resources consulting and management underwriting; the performance of other insurance services, such as accounting, claims management and handling, contract wording, information
systems and actuarial; the solicitation and servicing of the insurance and reinsurance needs of individual and commercial clients; and other similar enterprises in which any of the Protected Parties
may be engaged. For purposes of this Agreement, "Restricted Area" means any country in which a Business is or was conducted or contemplated by any of the Protected Parties. 

        (c)    Nonsolicitation.    The Executive further agrees that during the Noncompetition Period the Executive shall not
(i) in any manner, directly or indirectly, induce or attempt to induce any employee of the Company or any of its subsidiaries, including Aon Group, to terminate or abandon his or her employment
for any purpose whatsoever or (ii) in connection with any business to which Section 2(b) of this Noncompetition Agreement applies, call on, service, solicit or otherwise do business with
any customer of the Company or any of its subsidiaries, including Aon Group. 

10

 

        (d)    Exceptions.    Nothing in this Section 2 shall prohibit the Executive from being (i) a
stockholder in a mutual fund or a diversified investment company or (ii) an owner of not more than two percent (2%) of the outstanding stock of any class of a corporation, any securities of
which are publicly traded, so long as the Executive has no active participation in the business of such corporation. 

        (e)    Reformation.    If, at any time of enforcement of this Section 2 a court holds that the restrictions
stated herein are unreasonable under circumstances then existing, the Executive agrees that the maximum period, scope or geographical area reasonable under such circumstances shall be substituted for
the stated period, scope or area and that the court shall be allowed to revise the restrictions contained herein to cover the maximum period, scope and area permitted by law. This Noncompetition
Agreement shall not authorize a court to increase or broaden any of the restrictions in this Section 2. 

        3.    Confidentiality.    The Executive agrees that the Executive shall not, at any time after the termination of the
Executive's employment, make use of or disclose, directly or indirectly, any (i) trade secret or other confidential or secret information of the Company or any of its subsidiaries, including
Aon Group, or (ii) other technical, business, proprietary or financial information of the Company or any of its subsidiaries, including Aon Group, not available to the public generally or to
the competitors of the Company or to the competitors of any of its subsidiaries, including Aon Group ("Confidential Information"), except to the extent that such Confidential Information
(a) becomes a matter of public record or is published in a newspaper, magazine or other periodical or on electronic or other media available to the general public, other than as a result of any
act or omission of the Executive or (b) is required to be disclosed by any law, regulation or order of any court or regulatory commission, department or agency, provided that the Executive
gives prompt notice of such requirement to the Company to enable the Company to seek an appropriate protective order. Promptly following the termination of the Executive's employment, the Executive
shall surrender to the Company all records, memoranda, notes, plans, reports, computer disks and software and other documents and data which constitute Confidential Information which the Executive may
then possess or have under the Executive's control (together with all copies thereof). 

        4.    Enforcement.    The Executive acknowledges that the Company and its subsidiaries, including Aon Group, would be
damaged irreparably in the event that any provision of Section 2 or 3 of this Noncompetition Agreement were not performed in accordance with its terms or were otherwise breached and that money
damages would be an inadequate remedy for any such nonperformance or breach. Accordingly, the Executive agrees that the Company and its successors and permitted assigns shall be entitled, in addition
to other rights and remedies existing in their favor, to an injunction or injunctions to prevent any breach or threatened breach of any of such provisions and to enforce such provisions specifically
(without posting a bond or other security). The Executive agrees that the Executive will submit to the personal jurisdiction of the courts of the State of Illinois in any action by the Company to
obtain injunctive or other relief contemplated by this Section 4. 

        5.    Entire Agreement.    The Agreement, this Noncompetition Agreement and, if applicable, the Release of Severance
Payments and Benefits and the Release of Exercisability and Vesting (as such terms are defined in the Agreement, together, the "Releases") constitute the entire understanding between the parties. The
Executive has not relied on any oral statements that are not included in the Agreement, this Noncompetition Agreement or the Releases. 

        6.    Severability.    If any provision of this Noncompetition Agreement shall be held invalid or unenforceable, such
invalidity or unenforceability shall not affect any other provision hereof, and this Noncompetition Agreement shall be construed and enforced as if such provision had not been included. 

        7.    Governing Law.    This Noncompetition Agreement shall be construed, interpreted and applied in accordance with
the internal laws of the State of Illinois without regard to the principles of conflicts of laws. 

11

 

        IN
WITNESS WHEREOF, the Company has caused this Noncompetition Agreement to be executed by a duly authorized officer of the Company and the Executive has executed this Noncompetition
Agreement as of the day and year first above written. 

	

 	

AON CORPORATION
	

 	

By:	

	

 	

EXECUTIVE
	

 	

  
 [Executive's Name]

12

  

 
 

EXHIBIT B
  TO AGREEMENT    
    

RELEASE OF SEVERANCE

PAYMENTS AND BENEFITS  

        This Release of Severance Payments and Benefits (this "Release") is executed
by                        (the "Executive") pursuant to Section 3 of the Severance
Agreement dated as of January 21, 2005 (the "Agreement") between Aon Corporation, a Delaware corporation (the "Company"), and the Executive. 

        WHEREAS,
the Executive's employment with the Company and its subsidiaries is terminating; 

        WHEREAS,
the Executive acknowledges that the benefits to be provided to the Executive under the Agreement are in consideration of, and are sufficient to support, this Release; and 

        WHEREAS,
the Executive understands that the Company regards this Release as material and that the Company is relying on this Release in providing the severance payments and benefits to
the Executive pursuant to the Agreement. 

THE EXECUTIVE THEREFORE AGREES AS FOLLOWS:  

        1.    Severance Benefits.    The Executive's employment with the Company and its subsidiaries shall terminate on
                        , and the Executive has and will receive the severance payments and benefits set forth in Section 3
of the Agreement in accordance with the terms and subject to the conditions
thereof. 

        2.    Release.    The Executive, on behalf of the Executive and anyone claiming through the Executive, hereby agrees
to release and discharge, fully, finally and forever, the Company and all of its divisions, subsidiaries, affiliates and other related entities (whether or not such entities are wholly owned) and all
of the past, present and future directors, officers, administrators, trustees, fiduciaries, employees, agents and attorneys of the Company and of such other entities, and the predecessors, successors
and assigns of all of them (hereinafter referred to as the "Released Parties"), from any and all claims, causes of action, lawsuits, liabilities, debts, accounts, covenants, contracts, controversies,
agreements, promises, sums of money, damages, judgments and demands of any nature whatsoever, in law or in equity, both known and unknown, asserted or not asserted, foreseen or unforeseen, which the
Executive ever had or may presently have against any of the Released Parties arising from the beginning of time up to and including the effective date of this Release, arising out of or in connection
with the Executive's right to severance payments and benefits, which payments and benefits may, without limitation, include enhanced supplemental pension benefits conferred or equity awards granted as
a result of termination of employment from the Company or any of its subsidiaries which are not payable pursuant to the Agreement, but are payable pursuant to an employment agreement or other
compensation arrangement entered into between the Executive and the Company or any of its subsidiaries ("Alternative Severance Payments and Benefits"), and hereby agrees not to sue any of the Released
Parties based on any matter released herein. The consideration offered in the Agreement is accepted by the Executive as being in full accord, satisfaction, compromise and settlement of the Alternative
Severance Payments and Benefits, and that in the event of any proceedings whatsoever based upon any matter released herein, neither the Company nor any of the other Released Parties shall have any
further monetary or other obligation of any kind to the Executive arising out of or in connection with the Alternative Severance Payments and Benefits, including any obligation for any costs, expenses
or attorneys' fees incurred by or on behalf of the Executive. 

        3.    Governing Law.    This Release shall be construed, interpreted and applied in accordance with the internal laws
of the State of Illinois without regard to the principles of conflicts of laws. 

        IN
WITNESS WHEREOF, the Executive has executed this Release on                        . 

	 	 	EXECUTIVE
	

 	
 	

 [Executive's Name]

13

  

 
 

EXHIBIT C
  TO AGREEMENT    
    

RELEASE OF EXERCISABILITY

AND VESTING  

        This Release of Exercisability and Vesting (this "Release") is executed
by                        (the "Executive") pursuant to Section 4 of the Severance
Agreement dated as of                            , 2005 (the "Agreement") between Aon Corporation, a Delaware
corporation (the "Company"), and the Executive. 

        WHEREAS,
the Executive's employment with the Company and its subsidiaries is terminating; 

        WHEREAS,
the Executive acknowledges that the benefits to be provided to the Executive under the Agreement are in consideration of, and are sufficient to support, this Release; and 

        WHEREAS,
the Executive understands that the Company regards this Release as material and that the Company is relying on this Release in providing the severance payments and benefits to
the Executive pursuant to the Agreement. 

THE EXECUTIVE THEREFORE AGREES AS FOLLOWS:  

        1.    Equity Vesting.    The Executive's employment with the Company and its subsidiaries shall terminate on
                        , and the Executive will be entitled to the acceleration of exercisability of stock options and the
vesting of other
equity awards set forth in Section 4 of the Agreement in accordance with the terms and subject to the conditions thereof. 

        2.    Release.    The Executive, on behalf of the Executive and anyone claiming through the Executive, hereby agrees
to release and discharge, fully, finally and forever, the Company and all of its divisions, subsidiaries, affiliates and other related entities (whether or not such entities are wholly owned) and all
of the past, present and future directors, officers, administrators, trustees, fiduciaries, employees, agents and attorneys of the Company and of such other entities, and the predecessors, successors
and assigns of all of them (hereinafter referred to as the "Released Parties"), from any and all claims, causes of action, lawsuits, liabilities, debts, accounts, covenants, contracts, controversies,
agreements, promises, sums of money, damages, judgments and demands of any nature whatsoever, in law or in equity, both known and unknown, asserted or not asserted, foreseen or unforeseen, which the
Executive ever had or may presently have against any of the Released Parties arising from the beginning of time up to and including the effective date of this Release, arising out of or in connection
with the Executive's right to the acceleration of exercisability of stock options or the vesting of other equity awards granted by the Company to the Executive (or stock options or other equity awards
granted in substitution therefor by an acquiror of, or successor to, the Company), which acceleration or vesting is not pursuant to the Agreement, but is pursuant to an employment agreement or other
compensation arrangement entered into between the Executive and the Company or any of its subsidiaries ("Alternative Equity Vesting"), and hereby agrees not to sue any of the Released Parties based on
any matter released herein. The consideration offered in the Agreement is accepted by the Executive as being in full accord, satisfaction, compromise and settlement of the Alternative Equity Vesting,
and that in the event of any proceedings whatsoever based upon any matter released herein, neither the Company nor any of the other Released Parties shall have any further monetary or other obligation
of any kind to the Executive arising out of or in connection with the Alternative Equity Vesting, including any obligation for any costs, expenses or attorneys' fees incurred by or on behalf of the
Executive. 

        3.    Governing Law.    This Release shall be construed, interpreted and applied in accordance with the internal laws
of the State of Illinois without regard to the principles of conflicts of laws. 

        IN
WITNESS WHEREOF, the Executive has executed this Release on . 

	

 	
 	

EXECUTIVE
	

 	
 	

 [Executive's Name]

14

QuickLinks

Exhibit 10(z)

EXHIBIT A TO AGREEMENT

EXHIBIT B TO AGREEMENT

EXHIBIT C TO AGREEMENTQuickLinks
 -- Click here to rapidly navigate through this document

 
 

Exhibit 10(aa)    
    

AON CORPORATION EXECUTIVE SPECIAL SEVERANCE PLAN  

        Aon Corporation, a Delaware corporation (the "Company"), hereby adopts the Aon Corporation Special Executive Severance Plan (this "Plan") for the benefit of
certain employees of the Company and its subsidiaries. 

        This
Plan is intended to secure the continued services and ensure the continued dedication and objectivity of the Employees (as defined in Section 1(g)) in the event of any threat
or occurrence of, or negotiation or other action that could lead to, or create the possibility of, a Change in Control (as defined in Section 1(c)) of the Company, by providing to such
Employees certain protections so that such Employees need not be hindered or distracted by personal uncertainties and risks created by any such possible Change in Control. 

        This
Plan is intended to qualify as an unfunded plan maintained by the Company primarily for the purpose of providing deferred compensation for a select group of management or highly
compensated employees as described in sections 201(2), 301(a)(3) and 401(a)(1) of the Employee Retirement Income Security Act of 1974, as amended. 

        1.    Definitions.    As used in this Plan, the following terms shall have the respective meanings set forth below: 

        (a)   "Board"
means the Board of Directors of the Company. 

        (b)   "Cause"
means: 

        (1)   a
material breach by an Employee of those duties and responsibilities of the Employee which do not differ in any material respect from the duties and responsibilities of
the Employee during the 90-day period immediately prior to a Change in Control (other than as a result of incapacity due to physical or mental illness) which is demonstrably willful and
deliberate on the Employee's part, which
is committed in bad faith or without reasonable belief that such breach is in the best interests of the Company and which is not remedied in a reasonable period of time after receipt of written notice
from the Company specifying such breach; 

        (2)   Gross
misconduct, theft, fraud, breach of trust or any act of dishonesty by the Employee which results in material harm to the Company; or 

        (3)   the
commission by the Employee of a felony involving moral turpitude. 

        (c)   "Change
in Control" means: 

 

        (1)   the
acquisition by any individual, entity or group (a "Person"), including any "person" within the meaning of Section 13(d)(3) or 14(d)(2) of the Securities
Exchange Act of 1934, as amended (the "Exchange Act"), of beneficial ownership (within the meaning of Rule 13d-3 promulgated under the Exchange Act) of 30% or more of either
(i) the then outstanding shares of common stock of the Company (the "Outstanding Common Stock") or (ii) the combined voting power of the then outstanding securities of the Company
entitled to vote generally in the election of directors (the "Outstanding Voting Securities"); excluding, however, the following: (A) any acquisition directly from the Company (excluding any
acquisition resulting from the exercise of an exercise, conversion or exchange privilege unless the security being so exercised, converted or exchanged was acquired directly from the Company),
(B) any acquisition by the Company, (C) any acquisition by an employee benefit plan (or related trust) sponsored or maintained by the Company or any corporation controlled by the
Company, or (D) any acquisition by any corporation pursuant to a transaction which complies with clauses (i), (ii) and (iii) of subsection (3) of this Section 1(c);
provided further, that for purposes of clause (B), if any Person (other than the Company or any employee benefit plan (or related trust) sponsored or maintained by the Company or any
corporation controlled by the Company) shall become the beneficial owner of 30% or more of the Outstanding Common Stock or 30% or more of the Outstanding Voting Securities by reason of an acquisition
by the Company, and such Person shall, after such acquisition by the Company, become the beneficial owner of any additional shares of the Outstanding Common Stock or any additional Outstanding Voting
Securities and such beneficial ownership is publicly announced, such additional beneficial ownership shall constitute a Change in Control; 

        (2)   individuals
who, as of the date hereof, constitute the Board (the "Incumbent Board") cease for any reason to constitute at least a majority of such Board; provided that
any individual who becomes a director of the Company subsequent to the date hereof whose election, or nomination for election by the Company's stockholders, was approved by the vote of at least a
majority of the directors then comprising the Incumbent Board shall be deemed a member of the Incumbent Board; and provided further, that any individual who was initially elected as a director of the
Company as a result of an actual or threatened solicitation by a Person other than the Board for the purpose of opposing a solicitation by any other Person with respect to
the election or removal of directors, or any other actual or threatened solicitation of proxies or consents by or on behalf of any Person other than the Board shall not be deemed a member of the
Incumbent Board; 

        (3)   the
consummation of a reorganization, merger or consolidation or sale or other disposition of all or substantially all of the assets of the Company (a "Corporate
Transaction"); excluding, however, a Corporate Transaction pursuant to which (i) all or substantially all of the individuals or entities who are the beneficial owners, respectively, of the
Outstanding Common Stock and the Outstanding Voting Securities immediately prior to such Corporate Transaction will beneficially own, directly or indirectly, more than 60% of, respectively, the
outstanding shares of common stock, and the combined 

2

 

voting
power of the outstanding securities entitled to vote generally in the election of directors, as the case may be, of the corporation resulting from such Corporate Transaction (including, without
limitation, a corporation which as a result of such transaction owns the Company or all or substantially all of the Company's assets either directly or indirectly) in substantially the same
proportions relative to each other as their ownership, immediately prior to such Corporate Transaction, of the Outstanding Common Stock and the Outstanding Voting Securities, as the case may be,
(ii) no Person (other than: the Company; any employee benefit plan (or related trust) sponsored or maintained by the Company or any corporation controlled by the Company; the corporation
resulting from such Corporate Transaction; and any Person which beneficially owned, immediately prior to such Corporate Transaction, directly or indirectly, 30% or more of the Outstanding Common Stock
or the Outstanding Voting Securities, as the case may be) will beneficially own, directly or indirectly, 30% or more of, respectively, the outstanding shares of common stock of the corporation
resulting from such Corporate Transaction or the combined voting power of the outstanding securities of such corporation entitled to vote generally in the election of directors and
(iii) individuals who were members of the Incumbent Board will constitute at least a majority of the members of the board of directors of the corporation resulting from such Corporate
Transaction; or 

        (4)   the
consummation of a plan of complete liquidation or dissolution of the Company. 

        (d)   "Code"
means the Internal Revenue Code of 1986, as amended. 

        (e)   "Committee"
means the Organization and Compensation Committee of the Board. 

        (f)    "Company"
means Aon Corporation, a Delaware corporation. 

        (g)   "Employee"
means any person who is employed by the Company in an executive or officer position and who is designated by the Committee, in its sole discretion, as a
participant in this Plan from time to time. 

        (h)   "Good
Reason" means, without an Employee's express written consent, the occurrence of any of the following events after a Change in Control: 

        (1)   a
material adverse change in the nature or scope of the Employee's authority, powers, functions, duties or responsibilities as in effect immediately prior to such Change
in Control; 

        (2)   a
material reduction by the Company in the Employee's rate of annual base salary or bonus opportunity as in effect immediately prior to such Change in Control or as the
same may be increased from time to time thereafter; 

3

 

        (3)   the
failure of the Company to continue in effect any material employee benefit plan or compensation plan in which the Employee is participating immediately prior to such
Change in Control, unless the Employee is permitted to participate in other plans providing the Employee with substantially comparable benefits, or the taking of any action by the Company which would
adversely affect the Employee's participation in or materially reduce the Employee's benefits under any such plan; 

        (4)   a
change in the Employee's primary employment location to a location that is more than 50 miles from the primary location of the Employee's employment at the time of
such Change in Control; or 

        (5)   the
failure of the Company to obtain from any successor or transferee of the Company an express written and unconditional assumption of the Company's obligations under
this Plan, as further described in Section 17 of this Plan. 

For
purposes of this Plan, an isolated, insubstantial and inadvertent action taken in good faith and which is remedied by the Company promptly after receipt of written notice thereof given by the
Employee shall not constitute Good Reason. 

        (i)    "Nonqualifying
Termination" means the termination of an Employee's employment (1) by the Company for Cause, (2) by the Employee for any reason other than
Good Reason, (3) as a result of the Employee's death or (4) by the Company due to the Employee's absence from the Employee's duties with the Company on a full-time basis for
at least 180 consecutive days as a result of the Employee's incapacity due to physical or mental illness. 

        (j)    "Termination
Date" with respect to an Employee means the date during the Termination Period on which the Employee's employment is terminated other than by reason of a
Nonqualifying Termination. 

        (k)   "Termination
Period" with respect to an Employee means the period commencing upon a Change in Control and ending on the earlier to occur of (i) the date which is
two (2) years following such Change in Control and (ii) the Employee's death; provided, however, that, anything in this Plan to the contrary notwithstanding, if a Change in Control
occurs and if the Employee's employment with the Company was terminated prior to the date on which the Change in Control occurs, and if it is reasonably demonstrated by the Employee that such
termination of employment (a) was at the request of a third party who was taking steps reasonably calculated to effect a Change in Control or (b) otherwise arose in connection with or in
anticipation of a Change in Control, then for purposes of this Plan, "Termination Period" means the period of time commencing upon the date immediately prior to the date of such termination of
employment and ending on the earlier to occur of (x) two (2) years following such Change in Control and (y) the Employee's death. 

        2.    Payments and Benefits Upon Termination of Employment.    If during the Termination Period the employment of an
Employee shall terminate, other than by reason of a Nonqualifying Termination, and the Employee (or the Employee's executor or other legal 

4

 

representative
in the case of the Employee's death or disability following such termination) executes a noncompetition, nonsolicitation and confidentiality agreement substantially in the form of
Exhibit A hereto (the "Noncompetition Agreement") within 60 days following the Termination Date, the Company shall provide to the Employee, as compensation for services rendered to the
Company, and in consideration of the covenants set forth in the Noncompetition Agreement, the payments and benefits described in this Section 2. Notwithstanding the foregoing provisions of this
Section 2, if as a result of an Employee's termination of employment on the Termination Date an Employee is entitled to severance payments and benefits, which benefits may, without limitation,
include enhanced supplemental pension benefits conferred or equity awards granted as a result of termination of employment, from the Company or any of its subsidiaries which are not payable pursuant
to this Plan, but are payable pursuant to an employment agreement or other compensation arrangement entered into between such Employee and the Company or any of its subsidiaries ("Alternative
Severance Payments and Benefits"), such Employee shall have no right to any payments or benefits pursuant to this Section 2 unless (i) such Employee (or such Employee's executor or other
legal representative in the case of the Employee's death or disability following such termination) executes the Noncompetition Agreement and a release in the form of Exhibit B hereto (the
"Release of Severance Payments and Benefits") within 60 days following the Termination Date releasing all rights to the Alternative Severance Payments and Benefits, other than rights to
Alternative Equity Vesting (as defined in Section 3 hereof), and has not revoked the Release of Severance Payments and Benefits and (ii) the payments and benefits to be received by the
Employee pursuant to this Section 2 are reduced by the amount of the Alternative Severance Payments and Benefits, if any, previously received by the Employee. 

        (a)   The
Company shall pay to the Employee (or the Employee's beneficiary or estate, as the case may be) within 30 days following the date of execution of the
Noncompetition Agreement and, if applicable, the Release of Severance Payments and Benefits: 

        (1)   a
cash amount (subject to any applicable payroll or other taxes required to be withheld pursuant to Section 7 and any deductions authorized by the Employee) equal
to the sum of (i) the Employee's full annual base salary from the Company and its affiliated companies through the Termination Date, to the extent not theretofore paid, (ii) the average
of the Employee's annual cash incentive for each of the three fiscal years immediately preceding the fiscal year in which the Termination Date occurs, multiplied by a fraction, the
numerator of which is the number of days in the fiscal year in which the Termination Date occurs and the denominator of which is 365 or 366, as applicable, and (iii) any accrued vacation pay,
in each case to the extent not theretofore paid; plus 

        (2)   a
lump sum cash amount (subject to any applicable payroll or other taxes required to be withheld pursuant to Section 7 and any deductions authorized by the
Employee) in an amount equal to two (2) times the Employee's highest annual base salary from the Company and its affiliated companies in effect during the 12-month period prior to
the Termination Date; plus 

5

 

        (3)   a
lump sum cash amount (subject to any applicable payroll or other taxes required to be withheld pursuant to Section 7 and any deductions authorized by the
Employee) in an amount equal to the amount forfeited by the Employee under any qualified defined contribution plan maintained by the Company or any of its subsidiaries as a result of the Employee's
termination of employment. 

        (b)   The
Employee shall become fully (100%) vested in the Employee's accrued benefits under the Aon Corporation Excess Benefit Plan, the Aon Corporation Supplemental Savings
Plan and the Aon Corporation Supplemental Employee Stock Ownership Plan, or successor plans in effect on the date of the Employee's termination of employment (the "Nonqualified Plans"). The Employee's
accrued benefits under the Aon Corporation Excess Benefit Plan or the Aon Corporation Supplemental Savings Plan, whichever plan is applicable to the Employee on the date of the Employee's termination
of employment, shall be determined by crediting the Employee with two (2) additional years of age and service credits and, in the case of the Aon Corporation Supplemental Savings Plan, two
(2) additional years of Retirement Plan Contributions. Within 30 days following the Termination Date, the Company shall pay to the Employee a lump sum cash amount equal to the actuarial
equivalent of the Employee's accrued benefits under the Nonqualified Plans, determined as of the Employee's Termination Date, notwithstanding anything contained in the Nonqualified Plans to the
contrary. Such lump sum cash payment shall be computed in the case of the Aon Corporation Excess Benefit Plan using the same actuarial assumptions then in use for purposes of computing benefits under
plan, provided that the interest rate used in making such computations shall not be greater than the interest rate permitted under section 417(c) of the Code on the date of the Change in
Control. 

        (c)   For
the period commencing on the Termination Date and ending on the earlier of (i) the date which is two (2) years following the Termination Date and
(ii) the date on which the Employee becomes eligible to participate in and receive medical, dental and life insurance benefits under a plan or arrangement sponsored by another employer having
benefits substantially equivalent to the benefits provided pursuant to this Section 2(c), the Company shall continue the Employee's medical, dental and life insurance coverage, under the
Company-sponsored plans or otherwise, upon the same terms and otherwise to the same extent as such coverage shall have been in effect immediately prior to the Employee's Termination Date, and the
Company and the Employee shall share the costs of the continuation of such medical, dental and life insurance coverage in the same proportion as such costs were shared immediately prior to the
Termination Date. Such continuation of medical and dental coverage shall be in satisfaction of the Company's obligations under the Consolidated Omnibus Budget Reconciliation Act of 1985 (COBRA). 

        3.    Vesting of Equity Awards Upon Termination Date; Exercise Period.    Immediately upon an Employee's Termination
Date, all stock options and other equity awards, if any, granted by the Company to such
Employee (or stock options and other equity awards granted in substitution therefor by an acquiror of, or successor to, the Company) that are not otherwise exercisable or vested shall become
exercisable and vested in full. With respect to any and all outstanding stock options granted by the Company to such Employee, each such option shall remain exercisable following the Employee's
termination of employment until and 

6

 

including
the expiration date of the term of the option (as set forth in the written agreement relating to such option). Notwithstanding the foregoing provisions of this Section 3, if as a
result of an Employee's termination of employment on the Termination Date an Employee is entitled to the acceleration of exercisability of stock options or the vesting of other equity awards granted
by the Company to the Employee (or stock options or other equity awards granted in substitution therefor by an acquiror of, or successor to, the Company), which acceleration or vesting is not pursuant
to this Plan, but is pursuant to an employment agreement or other compensation arrangement entered into between such Employee and the Company or any of its subsidiaries ("Alternative Equity Vesting"),
such Employee shall have no rights pursuant to this Section 3 unless such Employee (or such Employee's executor or other legal representative in the case of the Employee's death or disability
following such termination) executes the Noncompetition Agreement and a release in the form of Exhibit C hereto (the "Release of Exercisability and Vesting") within 60 days following the
Termination Date releasing all rights to the Alternative Equity Vesting, and has not revoked the Release of Exercisability and Vesting. 

        4.    Reduction of Payments.    Anything in this Plan to the contrary notwithstanding, in the event it shall be
determined that any payment or distribution by the Company or its affiliated companies to or for the benefit of the Employee (whether paid or payable or distributed or distributable pursuant to the
terms of this Plan or otherwise, but determined without regard to any adjustment required under this Section 4) (in the aggregate, the "Total Payments") would be subject to the excise tax
imposed by Section 4999 of the Code or any interest or penalties are incurred by the Employee with respect to such excise tax (such excise tax, together with any such interest and penalties,
are hereinafter referred to as the "Excise Tax"), and if it is determined that (a) the amount remaining, after the Total Payments are reduced by an amount equal to all applicable federal and
state taxes (computed at the highest applicable marginal rate), including the Excise Tax, is less than (b) the amount remaining, after taking into account all applicable federal and state taxes
(computed at the highest applicable marginal rate), after payment or distribution to or for the benefit of the Employee of the maximum amount that may be paid or distributed to or for the benefit of
the Employee without resulting in the imposition of the Excise Tax, then the payments due hereunder shall be reduced so that the Total Payments are One Dollar ($1) less than such maximum amount. All
determinations to be made pursuant to this Section 4 shall be made by the public accounting firm that serves as the Company's auditor. 

        5.    Delay of Payments.    In the event that any payment or distribution to be made to the Employee hereunder is
determined to constitute "deferred compensation" subject to Section 409A of the Code, and the Employee is determined to be a "specified employee" (as defined in Section 409A of the
Code), such payment or distribution shall not be made before the date which is six months after the termination of the Employee's employment (or, if earlier, the date of the Employee's death). 

        6.    Plan Administration; Claims Procedure.    

        (a)   This
Plan shall be interpreted and administered by the Committee, or if the Committee has delegated its authority to interpret and administer this Plan, by the person or 

7

 

persons
appointed by the Committee from time to time to interpret and administer this Plan (the "Plan Administrator"), who shall have complete authority, in his or her sole discretion subject to the
express provisions of this Plan, to make all determinations necessary or advisable for the administration of this Plan. All questions arising in connection with the interpretation of this Plan or its
administration shall be submitted to and determined by the Plan Administrator in a fair and equitable manner in accordance with the procedure for claims and appeals described in Section 6(b). 

        (b)   Any
Employee whose employment has terminated who believes that he or she is entitled to receive benefits under this Plan, including benefits other than those initially
determined by the Plan Administrator to be payable, may file a claim in writing with the Plan Administrator, specifying the reasons for such claim. The Plan Administrator shall, within
90 days after receipt of such written claim (unless special circumstances require an extension of time, but in no event more than 180 days after such receipt), send a written
notification to the Employee as to the disposition of such claim. Such notification shall be written in a manner calculated to be understood by the claimant and in the event that such claim is denied
in whole or in part, shall (i) state the specific reasons for the denial, (ii) make specific reference to the pertinent Plan provisions on which the denial is based, (iii) provide
a description of any additional material or information necessary for the Employee to perfect the claim and an explanation of why such material or information is necessary, and (iv) set forth
the procedure by which the Employee may appeal the denial of such claim. The Employee (or his or her duly authorized representative) may request a review of the denial of any such claim or portion
thereof by making application in writing to the Plan Administrator within 60 days after receipt of such denial. Such Employee (or his or her duly authorized representative) may, upon written
request to the Plan Administrator, review any documents pertinent to such claim, and submit in writing issues and comments in support of such claim. Within 60 days after receipt of a written
appeal (unless special circumstances require an extension of time, but in no event more than 120 days after such receipt), the Plan Administrator shall notify the Employee of the final decision
with respect to such claim. Such decision shall be written in a manner calculated to be understood by the claimant and shall state the specific reasons for such decision and make specific references
to the pertinent Plan provision on which the decision is based. 

        (c)   The
Plan Administrator may from time to time delegate any of his or her duties hereunder to such person or persons as the Plan Administrator may designate. The Plan
Administrator is empowered, on behalf of this Plan, to engage accountants, legal counsel and such other persons as the Plan Administrator deems necessary or advisable for the performance of his or her
duties under this Plan. The functions of any such persons engaged by the Plan Administrator shall be limited to the specified services and duties for which they are engaged, and such persons shall
have no other duties, obligations or responsibilities under this Plan. Such persons shall exercise no discretionary authority or discretionary control respecting the administration of this Plan. All
reasonable fees and expenses of such persons shall be borne by the Company. 

8

 

        7.    Withholding Taxes.    The Company may withhold from all payments due under this Plan to each Employee (or the
Employee's beneficiary or estate) all taxes which, by applicable federal, state, local or other law, the Company is required to withhold therefrom. 

        8.    Reimbursement of Expenses; Interest on Late Payments.    

        (a)   If
any contest or dispute shall arise under this Plan involving termination of the Employee's employment with the Company or involving the failure or refusal of the
Company to perform fully in accordance with the terms hereof, the Company shall reimburse the Employee, on a current basis, for all legal fees and expenses, if any, incurred by the Employee in
connection with such contest or dispute, together with interest thereon at a rate equal to the prime rate, as published under "Money Rates" in The Wall Street Journal  from time to time, plus 300 basis
points, but in no event higher than the maximum legal rate permissible under applicable law (the "Interest Rate"), such interest to accrue
from the date the Company receives the Employee's written statement for such fees and expenses through the date of payment thereof; provided, however,
that in the event the resolution of any such contest or dispute includes a finding denying, in total, the Employee's claims in such contest or dispute, the Employee shall be required to reimburse the
Company, over a period of 12 months from the date of such resolution, for all sums advanced to the Employee pursuant to this Section 8(a). 

        (b)   With
respect to any and all payments that are required to be made by the Company to an Employee pursuant to this Plan and that are not made within the time period
specified herein, the Company shall pay to the Employee interest on such payments at the Interest Rate. Such interest shall accrue from the due date of the required payment through the date on which
such payment is made to the Employee. 

        9.    Amendment and Termination.    The Company shall have the right, in its sole discretion, pursuant to action by
the Board, to approve the amendment or termination of this Plan, which amendment or termination shall not become effective until the date fixed by the Board for such amendment or termination, which
date, in the case of an amendment which would be adverse to the interests of any Employee or in the case of termination, shall be at least 120 days after notice thereof is given by the Company
to the Employees in accordance with Section 19 hereof; provided, however, that no such action shall be taken by the Board during any period when
the Board has knowledge that any person has taken steps reasonably calculated to effect a Change in Control until, in the opinion of the Board, such person has abandoned or terminated its efforts to
effect a Change in Control; and provided further, that on and after a Change in Control, in no event shall this Plan be amended in a manner adverse to
the interests of any Employee or terminated. In the event that this Plan is determined to be a "deferred compensation plan" subject to Section 409A of the Code, the Committee shall, as
necessary, adopt such conforming amendments as are necessary to comply with Section 409A of the Code without reducing the payments and benefits due to the Employees hereunder. 

        10.    Entire Agreement.    Subject to Sections 2, 3 and 11(a) hereof, any amount paid pursuant to this Plan shall be
paid in lieu of any other amount of severance relating to salary or bonus continuation or any other continuation of medical, dental or life insurance coverage to 

9

 

be
received by the Employee upon termination of employment of the Employee under any severance plan, policy or arrangement of the Company. Subject to the foregoing and to the provisions of Sections 2
and 3 hereof, the rights of, and benefits payable to, an Employee pursuant to this Plan are in addition to any rights of, or benefits payable to, an Employee under any other employee benefit plan or
compensation program of the Company. All rights of an Employee under any such plan or program shall be determined in accordance with the provisions of such plan or program. 

        11.    Offset; Mitigation.    

        (a)   If
the Company is obligated by law to pay severance pay, notice pay or other similar benefits, or if the Company is obligated by law to provide advance notice of
separation ("Notice Period"), then any payments hereunder shall be reduced by the amount of any such severance pay, notice pay or other similar benefits, as applicable, and by the amount of any
severance pay, notice pay or other similar benefits received during any Notice Period. 

        (b)   In
no event shall an Employee be obligated to seek other employment or to take other action by way of mitigation of the amounts payable and the benefits provided to such
Employee under any of the provisions of this Plan, and such amounts and benefits shall not be reduced whether or not such Employee obtains other employment, except as otherwise provided in
Section 2(c) hereof. 

        12.    Unfunded Plan.    This Plan shall not be funded. No Employee entitled to benefits hereunder shall have any
right to, or interest in, any specific assets of the Company, but an Employee shall have only the rights of a general creditor of the Company to receive benefits on the terms and subject to the
conditions provided in this Plan. 

        13.    Payments to Minors, Incompetents and Beneficiaries.    Any benefit payable to or for the benefit of a minor, an
incompetent person or other person incapable of giving a receipt therefor shall be deemed paid when paid to such person's guardian or to the party providing or reasonably appearing to provide for the
care of such person, and such payment shall fully discharge the Company, the Plan Administrator and all other parties with respect thereto. If an Employee shall die while any amounts would be payable
to the Employee under this Plan had the Employee continued to live, all such amounts, unless otherwise provided herein, shall be paid in accordance with the terms of this Plan to such person or
persons appointed in writing by the Employee to receive such amounts or, if no person is so appointed, to the estate of the Employee. 

        14.    Non-Assignability.    None of the payments, benefits or rights of any Employee shall be subject to
any claim of any creditor, and, in particular, to the fullest extent permitted by law, all such payments, benefits and rights shall be free from attachment, garnishment, trustee's process or any other
legal or equitable process available to any creditor of such Employee. Except as otherwise provided herein or by law, no right or interest of any Employee under this Plan shall be assignable or
transferable, in whole or in part, either directly or by operation of law or otherwise, including without limitation by execution, levy, 

10

 

garnishment,
attachment or pledge; no attempted assignment or transfer thereof shall be effective; and no right or interest of any Employee under this Plan shall be subject to any obligation or
liability of such Employee. 

        15.    No Rights to Continued Employment.    Neither the adoption of this Plan, nor any amendment hereof, nor the
creation of any fund, trust or account, nor the payment of any benefits, shall be construed as giving any Employee the right to be retained in the service of the Company, and all Employees shall
remain subject to discharge to the same extent as if this Plan had not been adopted. 

        16.    Arbitration.    Except as otherwise provided in the Noncompetition Agreement, the Release of Severance Payments
and Benefits and the Release of Exercisability and Vesting, any dispute or controversy between the Company and the Employee, whether arising out of or relating to this Plan, the breach of the
provisions of this Plan, or otherwise, shall be settled by arbitration in Chicago, Illinois administered by the American Arbitration Association, with any such dispute or controversy arising under
this Plan being so administered in accordance with its Commercial Rules then in effect, and judgment on the award rendered by the arbitrator may be entered in any court having jurisdiction thereof.
The arbitrator shall have the authority to award any remedy or relief that a court of competent jurisdiction could order or grant, including, without limitation, the issuance of an injunction.
However, either party may, without inconsistency with this arbitration provision, apply to any court having jurisdiction over such dispute or controversy and seek interim provisional, injunctive or
other equitable relief until the arbitration award is rendered or the controversy is otherwise resolved. Except as necessary in court proceedings to enforce this arbitration provision or an award
rendered hereunder, or to obtain interim relief, neither a party nor an arbitrator may disclose the existence, content or results of any arbitration hereunder without the prior written consent of the
Company and the Employee. The Company and the Employee acknowledge that this Plan evidences a transaction involving interstate commerce. Notwithstanding any choice of law provision included in this
Plan, the United States Federal Arbitration Act shall govern the interpretation and enforcement of this arbitration provision. 

        17.    Successors; Binding Agreement.    This Plan shall inure to the benefit of and be binding upon the
beneficiaries, heirs, executors, administrators, successors and assigns of the parties, including each Employee, present and future, and any successor to the Company or one of its subsidiaries. This
Plan shall not be terminated by any merger or consolidation of the Company whereby the Company is or is not the surviving or resulting corporation or as a result of any transfer of all or
substantially all of the assets of the Company. In the event of any such merger, consolidation or transfer of assets, the provisions of this Plan shall be binding upon the surviving or resulting
corporation or the person or entity to which such assets are transferred. The Company agrees that concurrently with any merger, consolidation or transfer of assets referred to in this
Section 17, it will cause any surviving or resulting corporation or transferee unconditionally to assume all of the obligations of the Company hereunder. 

11

 

        18.    Headings.    The headings and captions herein are provided for reference and convenience only, shall not be
considered part of this Plan and shall not be employed in the construction of this Plan. 

        19.    Notices.    Any notice or other communication required or permitted pursuant to the terms hereof shall have
been duly given when delivered or mailed by United States mail, first class, postage prepaid, addressed to the intended recipient at his, her or its last known address. 

        20.    Effective Date.    This Plan shall be effective as of the date hereof and shall remain in effect unless and
until terminated by the Board pursuant to Section 8 hereof. 

        21.    Employment with, and Action by, Subsidiaries.    For purposes of this Plan, employment with the Company or
actions taken by the Company with respect to the Employee shall include employment with or actions taken by any corporation or other entity in which the Company has a direct or indirect ownership
interest of 50% or more of the total combined voting power of the then outstanding securities of such corporation or other entity entitled to vote generally in the election of directors. 

        22.    Governing Law; Validity.    This Plan shall be governed by, and construed and enforced in accordance with, the
internal laws of the State of Illinois (without regard to principles of conflicts of laws) to the extent not preempted by Federal law, which shall otherwise control. If any provision of this Plan
shall be held invalid or unenforceable, such invalidity or unenforceability shall not affect any other provision hereof, and this Plan shall be construed and enforced as if such provision had not been
included. 

        IN
WITNESS WHEREOF, the Company has caused this Plan to be adopted as of the 21st day of January, 2005. 

	 	 	AON CORPORATION
	

 	
 	

By:	

  

12

  

 
 

EXHIBIT A
  TO PLAN    
    

NONCOMPETITION, NONSOLICITATION

AND CONFIDENTIALITY AGREEMENT  

        This Noncompetition, Nonsolicitation and Confidentiality Agreement (this "Noncompetition Agreement") is executed by Aon Corporation, a Delaware corporation (the
"Company"), and                        (the "Employee") pursuant to Sections 2 and 3 of the Aon Corporation Executive Special
Severance Plan (the "Plan"). 

        WHEREAS,
the Employee is a participant in the Plan and the Employee's employment with the Company and its subsidiaries is terminating; 

        WHEREAS,
the Employee acknowledges that the benefits to be provided to the Employee under the Plan are in consideration of, and are sufficient to support, the covenants set forth in this
Noncompetition Agreement; and 

        WHEREAS,
the Employee understands that the Company regards the representations and covenants by the Employee in this Noncompetition Agreement as material and that the Company is relying
on such representations and covenants in paying amounts to the Employee pursuant to the Plan. 

        NOW,
THEREFORE, the Company and the Employee hereby agree as follows: 

        1.    Severance Benefits.    The Employee's employment with the Company and its subsidiaries shall terminate on
            , and the Employee shall receive the severance benefits set forth in the Plan in accordance with the terms and subject to the conditions thereof. 

        2.    Noncompetition;
Nonsolicitation.    (a)    General.    The Employee acknowledges that in the course of the
Employee's employment with the Company the Employee has become familiar with trade secrets and other confidential information concerning the Company and its subsidiaries, including Aon
Group, Inc., a Maryland corporation ("Aon Group"), and that the Employee's services were of special, unique and extraordinary value to the Company and its affiliates. 

        (b)    Noncompetition.    The Employee agrees that during the period commencing on the Employee's Termination Date (as
defined in the Plan) and ending on the date which is two years following the Employee's Termination Date (the "Noncompetition Period"), the Employee shall not in any manner, directly or indirectly,
through any person, firm, corporation or enterprise, alone or as a member of a partnership or as an officer, director, stockholder, investor or employee of or consultant to any other firm, corporation
or enterprise or otherwise, engage or be engaged, or assist any other person, firm, corporation or enterprise in engaging or being engaged, in any business, in which the Employee was involved or had 

13

 

knowledge,
being conducted by, or contemplated by, the Company or any of its subsidiaries, including Aon Group, as of the termination of the Employee's employment in any geographic area in which the
Company or any of its subsidiaries, including Aon Group, is then conducting such business. 

        (c)    Nonsolicitation.    The Employee further agrees that during the Noncompetition Period the Employee shall not
(i) in any manner, directly or indirectly, induce or attempt to induce any employee of the Company or any of its subsidiaries, including Aon Group, to terminate or abandon his or her employment
for any purpose whatsoever or (ii) in connection with any business to which Section 2(b) of this Noncompetition Agreement applies, call on, service, solicit or otherwise do business with
any customer of the Company or any of its subsidiaries, including Aon Group. 

        (d)    Exceptions.    Nothing in this Section 2 shall prohibit the Employee from being (i) a stockholder
in a mutual fund or a diversified investment company or (ii) an owner of not more than two percent (2%) of the outstanding stock of any class of a corporation, any securities of which are
publicly traded, so long as the Employee has no active participation in the business of such corporation. 

        (e)    Reformation.    If, at any time of enforcement of this Section 2 a court holds that the restrictions
stated herein are unreasonable under circumstances then existing, the Employee agrees that the maximum period, scope or geographical area reasonable under such circumstances shall be substituted for
the stated period, scope or area and that the court shall be allowed to revise the restrictions contained herein to cover the maximum period, scope and area permitted by law. This Noncompetition
Agreement shall not authorize a court to increase or broaden any of the restrictions in this Section 2. 

        3.    Confidentiality.    The Employee agrees that the Employee shall not, at any time after the termination of the
Employee's employment, make use of or disclose, directly or indirectly, any (i) trade secret or other confidential or secret information of the Company or any of its subsidiaries, including Aon
Group, or
(ii) other technical, business, proprietary or financial information of the Company or any of its subsidiaries, including Aon Group, not available to the public generally or to the competitors
of the Company or to the competitors of any of its subsidiaries, including Aon Group ("Confidential Information"), except to the extent that such Confidential Information (a) becomes a matter
of public record or is published in a newspaper, magazine or other periodical or on electronic or other media available to the general public, other than as a result of any act or omission of the
Employee or (b) is required to be disclosed by any law, regulation or order of any court or regulatory commission, department or agency, provided that the Employee gives prompt notice of such
requirement to the Company to enable the Company to seek an appropriate protective order. Promptly following the termination of the Employee's employment, the Employee shall surrender to the Company
all records, memoranda, notes, plans, reports, computer disks and software and other documents and data which constitute Confidential Information which the Employee may then possess or have under the
Employee's control (together with all copies thereof). 

14

 

        4.    Enforcement.    The Employee acknowledges that the Company and its subsidiaries, including Aon Group, would be
damaged irreparably in the event that any provision of Section 2 or 3 of this Noncompetition Agreement were not performed in accordance with its terms or were otherwise breached and that money
damages would be an inadequate remedy for any such nonperformance or breach. Accordingly, the Employee agrees that the Company and its successors and permitted assigns shall be entitled, in addition
to other rights and remedies existing in their favor, to an injunction or injunctions to prevent any breach or threatened breach of any of such provisions and to enforce such provisions specifically
(without posting a bond or other security). The Employee agrees that the Employee will submit to the personal jurisdiction of the courts of the State of Illinois in any action by the Company to obtain
injunctive or other relief contemplated by this Section 4. 

15

 

        5.    Entire Agreement.    The Plan, this Noncompetition Agreement and, if applicable, the Release of Severance
Payments and Benefits and the Release of Exercisability and Vesting (as such terms are defined in the Plan, together, the "Releases") constitute the entire understanding between the parties. The
Employee has not relied on any oral statements that are not included in the Plan, this Noncompetition Agreement or the Releases. 

        6.    Severability.    If any provision of this Noncompetition Agreement shall be held invalid or unenforceable, such
invalidity or unenforceability shall not affect any other provision hereof, and this Noncompetition Agreement shall be construed and enforced as if such provision had not been included. 

        7.    Governing Law.    This Noncompetition Agreement shall be construed, interpreted and applied in accordance with
the internal laws of the State of Illinois without regard to the principles of conflicts of laws. 

        IN
WITNESS WHEREOF, the Company has caused this Noncompetition Agreement to be executed by a duly authorized officer of the Company and the Employee has executed this Noncompetition
Agreement as of the day and year first above written. 

	 	 	AON CORPORATION
	

 	
 	

By:	

 
	 	 	 	

	

 	
 	

EMPLOYEE
	

 	
 	

 [Employee's Name]

16

  

 
 

EXHIBIT B
  TO PLAN    
    

RELEASE OF SEVERANCE

PAYMENTS AND BENEFITS  

        This Release of Severance Payments and Benefits (this "Release") is executed
by                        (the "Employee") pursuant to Section 2 of the Aon
Corporation Executive Special Severance Plan adopted on January 21, 2005 (the "Plan") by Aon Corporation, a Delaware corporation (the "Company"). 

        WHEREAS,
the Employee is a participant in the Plan and the Employee's employment with the Company and its subsidiaries is terminating; 

        WHEREAS,
the Employee acknowledges that the benefits to be provided to the Employee under the Plan are in consideration of, and are sufficient to support, this Release; and 

        WHEREAS,
the Employee understands that the Company regards this Release as material and that the Company is relying on this Release in providing the severance payments and benefits to
the Employee pursuant to the Plan. 

        THE
EMPLOYEE THEREFORE AGREES AS FOLLOWS: 

        1.    Severance Benefits.    The Employee's employment with the Company and its subsidiaries shall terminate on
                        , and the Employee has and will receive the severance payments and benefits set forth in Section 2 of
the Plan in accordance with the terms and subject to the conditions thereof. 

        2.    Release.    The Employee, on behalf of the Employee and anyone claiming through the Employee, hereby agrees to
release and discharge, fully, finally and forever, the Company and all of its divisions, subsidiaries, affiliates and other related entities (whether or not such entities are wholly owned) and all of
the past, present and future directors, officers, administrators, trustees, fiduciaries, employees, agents and attorneys of the Company and of such other entities, and the predecessors, successors and
assigns of all of them (hereinafter referred to as the "Released Parties"), from any and all claims, causes of action, lawsuits, liabilities, debts, accounts, covenants, contracts, controversies,
agreements, promises, sums of money, damages, judgments and demands of any nature whatsoever, in law or in equity, both known and unknown, asserted or not asserted, foreseen or unforeseen, which the
Employee ever had or may presently have against any of the Released Parties arising from the beginning of time up to and including the effective date of this Release, arising out of or in connection
with the Employee's right to severance payments and benefits, which payments and benefits may, without limitation, include enhanced supplemental pension benefits conferred or equity awards granted as
a result of termination of employment from the Company or any of its 

17

 

subsidiaries
which are not payable pursuant to the Plan, but are payable pursuant to an employment agreement or other compensation arrangement entered into between the Employee and the Company or any
of its subsidiaries ("Alternative Severance Payments and Benefits"), and hereby agrees not to sue any of the Released Parties based on any matter released herein. The consideration offered in the Plan
is accepted by the Employee as being in full accord, satisfaction, compromise and settlement of the Alternative Severance Payments and Benefits, and that in the event of any proceedings whatsoever
based upon any matter released herein, neither the Company nor any of the other Released Parties shall have any further monetary or other obligation of any kind to the Employee arising out of or in
connection with the Alternative Severance Payments and Benefits, including any obligation for any costs, expenses or attorneys' fees incurred by or on behalf of the Employee. 

        3.    Governing Law.    This Release shall be construed, interpreted and applied in accordance with the internal laws
of the State of Illinois without regard to the principles of conflicts of laws. 

        IN
WITNESS WHEREOF, the Employee has executed this Release on                        . 

	 	 	EMPLOYEE
	

 	
 	

 [Employee's Name]

18

  

 
 

EXHIBIT C
  TO PLAN    
    

RELEASE OF EXERCISABILITY

AND VESTING  

        This Release of Exercisability and Vesting (this "Release") is executed
by                        (the "Employee") pursuant to Section 3 of the Aon Corporation
Executive Special Severance Plan adopted on January 21, 2005 (the "Plan") by Aon Corporation, a Delaware corporation (the "Company"). 

        WHEREAS,
the Employee is a participant in the Plan and the Employee's employment with the Company and its subsidiaries is terminating; 

        WHEREAS,
the Employee acknowledges that the benefits to be provided to the Employee under the Plan are in consideration of, and are sufficient to support, this Release; and 

        WHEREAS,
the Employee understands that the Company regards this Release as material and that the Company is relying on this Release in providing the severance payments and benefits to
the Employee pursuant to the Plan. 

        THE
EMPLOYEE THEREFORE AGREES AS FOLLOWS: 

        1.    Equity Vesting.    The Employee's employment with the Company and its subsidiaries shall terminate on
                        , and the Employee will be entitled to the acceleration of exercisability of stock options and the vesting
of other equity awards set forth in Section 3 of the Plan in accordance
with the terms and subject to the conditions thereof. 

        2.    Release.    The Employee, on behalf of the Employee and anyone claiming through the Employee, hereby agrees to
release and discharge, fully, finally and forever, the Company and all of its divisions, subsidiaries, affiliates and other related entities (whether or not such entities are wholly owned) and all of
the past, present and future directors, officers, administrators, trustees, fiduciaries, employees, agents and attorneys of the Company and of such other entities, and the predecessors, successors and
assigns of all of them (hereinafter referred to as the "Released Parties"), from any and all claims, causes of action, lawsuits, liabilities, debts, accounts, covenants, contracts, controversies,
agreements, promises, sums of money, damages, judgments and demands of any nature whatsoever, in law or in equity, both known and unknown, asserted or not asserted, foreseen or unforeseen, which the
Employee ever had or may presently have against any of the Released Parties arising from the beginning of time up to and including the effective date of this Release, arising out of or in connection
with the Employee's right to the acceleration of exercisability of stock options or the vesting of other equity awards granted by the Company to the Employee (or stock options or other equity awards
granted in substitution therefor by an acquiror of, or successor to, the Company), which acceleration or vesting is not pursuant to the Plan, but is pursuant to an employment agreement or other
compensation 

19

 

arrangement
entered into between the Employee and the Company or any of its subsidiaries ("Alternative Equity Vesting"), and hereby agrees not to sue any of the Released Parties based on any matter
released herein. The consideration offered in the Plan is accepted by the Employee as being in full accord, satisfaction, compromise and settlement of the Alternative Equity Vesting, and that in the
event of any proceedings whatsoever based upon any matter released herein, neither the Company nor any of the other Released Parties shall have any further monetary or other obligation of any kind to
the Employee arising out of or in connection with the Alternative Equity Vesting, including any obligation for any costs, expenses or attorneys' fees incurred by or on behalf of the Employee. 

        3.    Governing Law.    This Release shall be construed, interpreted and applied in accordance with the internal laws
of the State of Illinois without regard to the principles of conflicts of laws. 

        IN
WITNESS WHEREOF, the Employee has executed this Release
on                                         
       .
 

	 	 	EMPLOYEE
	

 	
 	

 [Employee's Name]

20

QuickLinks

Exhibit 10(aa)

EXHIBIT A TO PLAN

EXHIBIT B TO PLAN

EXHIBIT C TO PLAN

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00080-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00080-of-00352.parquet"}]]