Outsourcing Town Hall Q2 2012 Outsourcing Town

Key Metrics*– Aon Delivered Significant Progress in Q4 & 2012 Organic Revenue
Solid growth across both Risk and HR Solutions in Q4, including strong growth in Consulting Services of +8%
Rate of organic revenue for 2012 has improved to +4% from +2% in 2011, 0% in ‘2010 and -1% in 2009 Operating Margin
In Q4, a +50bps increase in HR Solutions was primarily offset by higher unallocated expenses
For 2012, Risk Solutions increased+10bps as organic growth and restructuring savings more than offset significant investments in the business EPS
In Q4, organic revenue, restructuring savings, lower effective tax rate and effective capital management drove 9% growth
Repurchased approximately $500 million of ordinary shares in Q4 and $1.1 billion in 2012 * The key metrics above are non-GAAP measures that are reconciled in the appendix of this presentation
Organic revenue excludes the impact of foreign exchange, acquisitions, divestitures, transfers, reimbursable expenses and unusual items. Change in organic revenue, a non-GAAP measure, is reconciled to the corresponding U.S. GAAP percent change in revenue in Appendix A of this presentation
Certain noteworthy items impacted Operating Income and Earnings per Share in the fourth quarter and full year of 2012 and 2011. A Reconciliation of Non-GAAP Measures for Operating income and Diluted Earnings per Share is in Appendix B of this presentation
Free cash flow is defined as cash flow from operations less capital expenditures. This non-GAAP measure does not imply or represent a precise calculation of residual cash flow available for discretionary expenditures. A reconciliation can be found in Appendix A of this presentation Free Cash Flow
Improved working capital performance (predominantly accounts receivable) more than offset an increase in pension contributions
Record cash flow from operations of $1.4 billion in 2012 Proprietary & Confidential 3<br>

Organic Revenue¹ – Solid Growth Across Each Segment Q4
Americas: Solid growth across all regions: Latin America, U.S. retail and Canada

International: Strong growth across Asia and emerging markets and modest growth in continental Europe, partly offset by a modest decline in Australia

Reinsurance: Strong growth in treaty globally driven by a favorable impact from pricing in the near-term and new business, partially offset by a significant decline in capital markets transactions and advisory business Q4
Consulting: Strong growth in investment consulting, pension administration services and talent and rewards consulting 

Outsourcing: Strong growth from HC exchanges, new client wins and demand for discretionary services in HR business process outsourcing, partly offset by a modest decline in benefits administration Organic revenue excludes the impact of foreign exchange, acquisitions, divestitures, transfers, reimbursable expenses and unusual items. Change in organic revenue, a non-GAAP measure, is reconciled to the corresponding U.S. GAAP percent change in revenue in Appendix A of this presentation Proprietary & Confidential 4<br>

Q4 2012 Aon Financials 5<br>

INSERT BUSINESS FINANCIALS HERE Note to presenters: We can not show specific financial results for Benefits, HR BPO, Exchanges, or Emerging Solutions due to external reporting guidelines. However, leaders in each organization will receive a separate slide for reporting their results. Insert the appropriate slide here based on your audience. 6 Proprietary & Confidential<br>

Aon Risk Solutions Full-Year 2012 Snapshot Top-line growth of 3%, 3% Americas, 3% International

Strong double-digit growth in Asia, New Zealand, Latin America and EMEA AGRC and GRIP Solutions

Solid organic growth in US Affinity, France and emerging markets (Africa, Central and Eastern Europe)

Overall 7% revenue growth in Health & Benefits (4% Americas, 4% International 10% including EMEA 7%, Asia 23%, Pacific 9%)

Strong retention 92% and improved rollover 91% with slightly more favorable market environment

Double digit percentage PTI expansion in US Retail, Canada, Latin America, France, Africa, and Asia driven by growth and positive spread

Progress on key initiatives: Aon Broking, Aon Client Promise, Aon GRIP, Working Capital/Cash and on our Talent agenda Challenging revenue and PTI in a number of businesses (i.e., Germany, Spain, UK Affinity, Latin America Affinity and Australia)

Overall weak new business in many geographies; overall improved in second half but was flat for the full year

Negative / minimal spread in key geographies constrained PTI and margin expansion

Salary increases (merits and off cycle increases) contributed to a 90 bp deterioration in the SIB-to-revenue ratio (our key metric determining margin) and put significant pressure on margins Proprietary & Confidential 7<br>

Aon Benfield Full-Year 2012 Snapshot Annualized 5% organic revenue growth to USD1.5bn
Healthy 2% Q4 organic revenue growth to USD349m
5th consecutive quarter-on-quarter revenue growth across Treaty, Fac, Inpoint and capital markets business
7th consecutive quarter of positive new business won in Treaty
The Aon Benfield platform is unique: scale + analytics = client value
Measurable success from our Articulating Value programme Record levels of reinsurance capital putting pressure on rates in certain lines of business
Pricing under pressure in some sectors
Potential for adverse development related to Hurricane/Superstorm Sandy
Lower reinsurance demand due to sluggish insurer demand growth in difficult economic environment
Very competitive insurance landscape is also putting pressure on reinsurance demand Proprietary & Confidential 8<br>

Aon Hewitt Full-Year 2012 Snapshot Good PTI performance to plan
Delivered solid growth of 4%
Outsourcing: HR BPO, Emerging Solutions and Exchanges
Consulting: U.S. Retirement, PRT, APAC, NA Communications
Growth rate accelerating in new areas: Investment Consulting, Pension De-Risking, Exchanges, Advisory
Regaining market innovator reputation
Near flawless enrollment season in Exchanges
Improvement in client retention and compression rates
Client satisfaction trending up
Turning the corner on PeopleSoft Year over Year PTI and margin decline driven by:
Outsourcing compression/losses
PeopleSoft impacts
Slow first half growth in Consulting
Investments
Macroeconomic concerns impacted demand in EMEA and APAC
Colleague engagement lagging other progress Proprietary & Confidential 9<br>

We Exceeded Our Plan Commitments on 2012 Pre-Tax Income Much to be proud of this year, but still below our pre-tax income (PTI) results for 2011 $605MM 2011 Actual 2012 Plan 2012 Stretch Target $668MM $636MM 2012 Actual $651MM 10<br>

Aon Hewitt’s Newest Line of Business: Health Care Exchanges New medical plan enrollments compared to our target

Missed appointments

Appointments completed on time

Customer satisfaction in interactions with benefits advisors Total plan enrollments for medical, dental, and vision

Total AE calls taken across 3 Corporate Exchange clients

AE calls answered in 30 seconds or less

Portion of enrollments completed online 11 Aon Hewitt Navigators 104.9% 0 99.7% 92% Corporate Exchange 95% 100,000 36,000 94% Aggressively grow through both business-to-business and direct-to- consumer strategies
Deploy a new platform and website to enhance retiree experience and team productivity
Ramp up for increased enrollment volume for 2013 AE (3x 2012 levels) 2013 Focus AE Results Convert strong client interest into confirmed wins
Scale our operations to support the high demand for this solution
Differentiate our solution in the market—we offer a real exchange with true competition between carriers<br>

Technology<br>

Improving the Colleague Experience Through Technology Aon Technology continuously works to improve colleague productivity—offering enhanced collaboration, conferencing, and communication tools.
Between now and Q2 2014, there are a number of impactful changes planned, including:
Standardizing the Aon colleague desktop with Office 2010, Windows 7, and Aon AppStore.
Increasing access to corporate email, calendar, instant messaging, and contacts through various mobile technologies.
Making it easier to share files across the organization.
Expanding voice and video capabilities.
Standardizing North America printer, fax, copier, and scan equipment.
Ensuring the Global Service Desk offers the highest quality standards.

Visit the Colleague Technology Experience site to learn more and share your experiences. 13<br>

BPO HR BPO<br>

HR BPO 2012 Snapshot 15 Client relationships very strong Colleagues are the core of our business Need to grow revenue and focus on margin Proprietary & Confidential<br>

Our New Themes for 2013 16 Proprietary & Confidential<br>

Our Business Plan Balances the Interests of Our Three Primary Stakeholders Achieve the short and long term business plan Realize the return on our strategic and growth investments Fulfill our full promise to clients Deliver industry leading service excellence and operational effectiveness Drive results through increased focus, business acumen and accountability Colleagues Shareholders Clients 2 1 6 3 5 Foster a culture where colleagues can do their best work and new ideas are nurtured 4 17 17<br>

2013 HR BPO Goals 2 1 3 4 6 5 Colleagues Clients Shareholders 18<br>