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Dialog Increases Content Available Through InSite^SM Service

No Price Increase Results From Larger Content Pool

CARY, N.C., USA (May 21, 2003) — Dialog, a Thomson (TSX: TOC; NYSE: TOC) business and a leading worldwide provider of online-based information services and integrated information solutions, said today that it has added content from about 850 publications to InSite^SM , its online service that offers business users access to collections of specialized content.

The 850 new publications now available for full-text searching and article retrieval represent a 36 percent increase in content available through InSite, the company said.

The new content includes publications focused on topics such as health, the pharmaceutical industry, technology, law, advertising, defense, economics and general business issues. The publications represent a cross section of business research and reporting published worldwide, with sources drawn from Africa, Asia, Europe and North America.

InSite now has a total of more than 5,000 sources available. The database includes a five-year archive for most of the sources.

Dialog added that there is no increase in the price of InSite subscriptions resulting from the larger content pool now available through the service.

"This is a win-win for InSite users," said Viji Krishnan, Dialog vice president of content development. "The broad coverage of companies, industries and general information included in the new content will benefit users in all industries we serve. They're getting more — a lot more — without having to pay more."

InSite is one of the products offered by the formerly independent Intelligence Data, now part of Dialog. Other Intelligence Data products now offered through Dialog are Intelliscope^SM (featuring investment research) and Intrascope^SM, which supplies content to enterprise intranets.

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About Dialog and The Thomson Corporation
Dialog, a pioneer in developing the technology behind electronic information retrieval, is the world leader in providing online-based information services to organizations seeking competitive advantages in such fields as business, science, engineering, finance and law.

Today, Dialog's online services — offered through the Dialog®, Dialog Profound®, Dialog DataStar™, NewsEdge and Intelligence Data brands — give users the ability to precisely retrieve data from more than 1.4 billion unique records, accessible via the Internet or through delivery to enterprise intranets. Searchable content includes articles and reports from thousands of real-time news feeds, newspapers, broadcast transcripts and trade publications, plus research reports and analyst notes providing support for financial decision-making, as well as in-depth repositories of scientific and technical data, patents, trademarks and other intellectual property data. Information professionals and end-users at business, professional and government organizations in more than 100 countries prize Dialog services for their depth and breadth of content, precision searching and speed.

Based in Cary, N.C., USA, Dialog has operations in 28 other countries worldwide. Dialog (www.dialog.com) is a business of The Thomson Corporation (TSX: TOC; NYSE: TOC). With 2002 revenues of US$7.8 billion, Thomson (www.thomson.com) is a global leader in providing integrated information solutions to business and professional customers.

All designated trademarks used herein are the property of The Dialog Corporation or its subsidiaries. Registered marks are registered by The Dialog Corporation or its subsidiaries with the U.S. Patent and Trademark Office. All other marks are trademarks or registered trademarks of their respective owners.

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