THOMSON FINANCIAL RELEASES THOMSON PORTIA v9.0

London - 3 December 2007

Thomson Financial, an operating unit of The Thomson Corporation (NYSE: TOC, TSX: TOC) and leading provider of information and technology solutions to the worldwide financial community, announces the launch of Thomson PORTIA v9.0, the most innovative upgrade to PORTIA’s leading investment accounting system in its 20 year history.

This new release broadens the scope of Thomson PORTIA by adding significant new functional and technical capabilities and provides clients with a global-enterprise wide accounting solution to support the unique requirements of any organization including investment managers, alternative investment managers, insurance companies and hedge funds. Major enhancements include the introduction of an integrated investment ledger and enhanced workflow support for complex assets.

Christen Bremner, Managing Director, Thomson PORTIA commented: “We created this enhanced version of PORTIA following close consultation with our global client base. It represents many years of continuous investment in PORTIA and the enhanced functionality will ensure PORTIA maintains its preeminent position in the market. These enhancements ensure that PORTIA delivers a flexible and scalable an investment accounting solution that can adapt to the full range of multi-asset investment approaches prevalent in today’s market.”

The new version expands the scope of how Thomson PORTIA can help an enterprise, allowing new business to be brought onto the system while also supporting more of the requirements of the middle to back office. Core functional improvements have been made in areas such as advanced accounting allowing managers to comply with the latest accounting standards. Support for a number of new global and regional security types and asset classes have also been added. Powerful new integration capabilities include: publish and subscribe facility for better and timelier automation and a web services interface directly to PORTIA business logic.

Thomson PORTIA v9.0 has made significant advancements in driving an optimized workflow including:

• Complex Assets – the new swap manager automates the trading and management of multi-legged asset types eliminating manual and operational risk. Asset types covered include: Credit default Swaps, Interest Rate Swaps, Currency Swaps, Equity Swaps, Total return Swaps, Swaptions, Syndicated loans, Repos and Reverse Repos.

Hedging features available include the ability to monitor cost, market value and profit and loss in real time, define strategies, and measure effectiveness by portfolio, strategy, security type and on the fly grouping. These new features give clients greater flexibility in managing their hedge portfolios.

• Investment Ledger - allows clients to create multiple charts of accounts and define specific postings rules for both transactions and holdings. Reporting on ledger activity is available through pre-configured balance sheets, profit & loss statements and cash flow statements.

Thomson PORTIA revolutionizes how clients approach their day-to-day operations by providing an open, flexible and high performing system that is instrumental to ensuring an ideal workflow and streamlined operation. Providing an enterprise-wide solution, Thomson PORTIA allows investment managers, asset managers, hedge funds and insurance companies the powerful tools they need to reliably manage daily transaction activity, seamlessly integrate with other systems, settle trades with ease and generate a wide-range of reports for clients, management and regulators. Thomson PORTIA is the book of records and hub for all portfolio activity used by 300 firms in over 40 countries to manage more than 15 Trillion dollars worth of assets. Thomson PORTIA is the investment professional’s go-to choice to manage assets.

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