TradeWeb Launches Specified Pools Trading; Expands Industry-leading Mortgage Marketplace

JERSEY CITY, NJ (May 1, 2007) - Thomson TradeWeb, the leading online marketplace for Fixed Income and Derivatives, and a unit of The Thomson Corporation (NYSE: TOC; TSX: TOC), today announced that it has launched a multi-dealer-to-customer online market for the trading of specified pools of mortgages. Working closely with the major mortgage dealers and a core group of leading buy-side institutions, TradeWeb has built a unique marketplace that provides mortgage professionals with the capability to research pool criteria, search multiple dealer inventory, execute and seamlessly process trades in real-time on a single platform. TradeWeb's new specified pools platform also allows clients to send targeted inquiry to individual dealers ('reverse axes").

Specified pools are baskets of individual mortgages, which have been securitized into unique mortgage-backed securities. The individual characteristics of these pools allow investors to better match their investments with their trading strategies.

"With record trading levels in 2007, TradeWeb clearly stands outs as the No. 1 online mortgage marketplace. With the support of our dealers and clients, we look forward to gaining as significant traction in specified pools as we have in TBAs," said Billy Hult, Managing Director and Head of U.S. Markets at Thomson TradeWeb.

TradeWeb launched its To-Be-Announced ("TBA") mortgage-backed securities market in February 2001. It now has average daily trading volume in excess of $70 billion.

"TradeWeb is injecting much-needed liquidity to the Specified Pools market, which we are fully supportive of," said Tim Cunneen, Principal at Smith Breeden Associates.

"Specified pools is a natural extension of TradeWeb's well-entrenched mortgage business. We're already seeing evidence that this will become an important distribution channel for UBS," said Mike Marsallo, Head MBS Trader at UBS.

TradeWeb launches its specified pools marketplace with the strong support of 15 mortgage dealers, which are committed to providing liquidity to their clients.

About Thomson TradeWeb

TradeWeb is the leading online fixed-income trading network with over 11 million trades executed and total volume surpassing $175 trillion since its inception in 1998. TradeWeb's multi-dealer auction model links the trading desks of 35 of the world's leading Fixed-Income dealers with more than 2,200 buy-side institutions in North America, Europe, and Asia. On average, over $200 billion in trading volume gets executed over TradeWeb each day.

The business is also the leading electronic "straight-through processing" network for the fixed-income markets, providing dealers and buy-side institutions with paperless trade allocations and confirmations on its fully-integrated TradeXpress network. TradeWeb's STP network also includes AccountNet, the first derivatives counterparty management tool and the leading data warehouse for standing settlement instructions and OTC derivatives legal documentation.

Thomson TradeWeb operates within the Thomson Financial group of businesses. TradeWeb LLC is a member of the NASD. TradeWeb Europe Limited is regulated by the U.K. Financial Services Authority.

About Thomson Financial

Thomson Financial, with 2006 revenues of US$2 billion, is a provider of information and technology solutions to the worldwide financial community. Through the widest range of products and services in the industry, Thomson Financial helps clients in more than 70 countries make better decisions, be more productive and achieve superior results. Thomson Financial is part of The Thomson Corporation (www.thomson.com), a global leader in providing essential electronic workflow solutions to business and professional customers. With operational headquarters in Stamford, Conn., Thomson provides value-added information, software tools and applications to professionals in the fields of law, tax, accounting, financial services, scientific research and healthcare. The Corporation's common shares are listed on the New York and Toronto stock exchanges (NYSE: TOC; TSX: TOC).