HENDERSON GLOBAL INVESTORS SELECTS THOMSON ONE INVESTMENT MANAGEMENT

LONDON, 17 October 2005-- 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, today announced that it has signed a contract with Henderson Global Investors, the leading investment manager with over £66.5bn of assets under managements, to deploy positions of Thomson ONE in London, Singapore and Tokyo. Specific terms of the deal were not disclosed.

Henderson Global Investors will deploy the Thomson ONE application framework to the key functions of funds management, research analysis and performance measurement. Henderson users in London will be amongst the first European clients to adopt the recently launched Thomson ONE Investment Management. Users in Asia will initially use Thomson ONE Analytics and will be upgraded later this year. All Henderson users will take advantage of Thomson Financial’s internal research publishing functionality which has a tangible impact in helping improve productivity and efficiency.

Lesley Cairney, Director of Equity Operations, Henderson commented: "This agreement is a natural evolution to our longstanding relationship with Thomson Financial, which spans over 10 years. As one of the first adopters of Thomson ONE Investment Management, we have worked closely with Thomson to ensure the solution can be configured to meet our users’ needs. This agreement enables us to consolidate and integrate our content requirements at a lower total cost of ownership."

Thomson ONE Investment Management combines Thomson Datastream’s encyclopedic databases with Thomson’ interactive portfolio analytics service, in addition to Thomson’s global real-time market data and news, and extensive estimates, research and fundamental content.

David Bilbé, European Commercial Director, Thomson Financial commented: "We are pleased that Henderson, a world class asset management firm, selected Thomson ONE. Henderson has relied on individual Thomson products like Datastream, I/B/E/S and Worldcsope for many years. Henderson already utilises the internal research publishing functionality contained within Thomson ONE Analytics and the upgrade to Thomson ONE Investment Management will have a tangible impact in helping their users improve productivity and efficiency."

Thomson ONE Investment Management has been built around investment management workflows. The open application framework reflects and facilitates many different functions, from uncovering opportunities and evaluating market trends to understanding and communicating sources of portfolio performance. Interactive functionality gives quick and easy access to in-depth content across the available data universe, making it easy to move between key data sets and analytic or charting tools, while maintaining context on a particular company. Users can easily navigate from monitoring a ticker in real-time to viewing the company’s broker estimates or charting its historical time series versus the sector or market.

The package contains the full breadth and depth of Thomson Datastream’s financial and economics databases, as well as its full set of charting and Microsoft Office interface tools. It also allows users to access industry-leading portfolio analytics, which provides performance attribution and portfolio profiling. The intuitive, graphical format enables drill-down access to a portfolio and identifies exceptions that require further research.

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