THOMSON FINANCIAL TO OPTIMIZE THOMSON PORTIA FOR THE MICROSOFT PLATFORM

NEW YORK, NY, May 17, 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, announced a multiyear alliance to further optimize Thomson PORTIA for the Microsoft platform. This alliance will deliver middle to back office solutions for the worldwide financial community built using the latest Microsoft technology, including the Microsoft .NET Framework and Windows Server System. By optimizing PORTIA, Thomson Financial’s industry-leading portfolio management system, Thomson Financial and Microsoft will enable customers to increase the strategic value of their IT investments while reducing complexity and cost.

This alliance expands on an existing relationship and represents a commitment between the companies to more closely align future software development, along with joint marketing and sales activities globally.

"This is about reaching new customers and markets with new products and solutions," said Sharon Rowlands, president and chief operating officer, Thomson Financial. "By deepening the relationship between Thomson and Microsoft we will be able to lead with solutions that combine the strength of the latest Microsoft technologies and Thomson Financial’s unparalleled understanding of the needs of the financial manager."

"Microsoft is excited to be working with Thomson to deliver added value to the worldwide financial community," said Sanjay Parthasarathy, corporate vice president of the Developer & Platform Evangelism Group at Microsoft.. "More important, we share a common vision for how applications need to evolve to meet our mutual customers’ needs — a vision centered around delivering the most interoperable and reliable solutions possible for their mission-critical applications."

The alliance will also involve collaboration between Microsoft and Thomson Financial software architects in designing, building, and testing new versions of and functionality for Thomson PORTIA. "Thomson PORTIA versions 7.0, 8.0 and 9.0 will be developed with the Microsoft .NET Framework and Windows Server System software," said Suresh Kavan, president, Corporate, Investment Management, and Investment Banking, Thomson Financial. "As new PORTIA functionality is built out, other Thomson Financial solutions will benefit from the increased opportunities for application, business logic and code-re-use across Thomson ONE," said Kavan.

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