THOMSON FINANCIAL INTRODUCES ENHANCED VERSION OF THOMSON PORTIA

New Features Broaden Scope of Offering and Enable Clients to Improve Operational Efficiency

NEW YORK, NY, April 11, 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 introduced Thomson PORTIA v7.0, an enhanced version of Thomson PORTIA, the industry’s leading portfolio management system.

This new release broadens the scope of PORTIA by adding significant new functional and technical capabilities. Major features include Stored Holdings and Cash Management, as well as a number of improvements to core PORTIA, such as additional User Defined fields, Report Writer enhancements and Batch processing capabilities. PORTIA leverages the latest technologies through the use of the Microsoft .NET platform, offering a modern User Interface and optimal user experience for many of the new features and functionality.

This release represents a strong commitment by Thomson Financial to PORTIA clients and is the first in a series that will continue for the next few years. "The PORTIA business has seen strong growth over the past 12-18 months, we have signed on 15 new PORTIA customers and have worked with 50 of our existing clients to expand their use of PORTIA by adding additional users, new business lines or functional modules," said William Haney, senior vice president, Thomson Financial. "In addition, many PORTIA clients have upgraded to the most recent PORTIA release, with over 90 clients upgrading in 2004, nearly all of them levering PORTIA Professional Services to get the job done."

"This new, enhanced version of PORTIA focuses on advancing PORTIA’s core capabilities while adding brand new functionality and customization options that enables our clients to improve the efficiency of their operations and increase the value they derive from PORTIA," said Christen Bremner, senior vice president, Thomson Financial. "With the new cash management features, clients are now able to obtain a better understanding of current, future and projected cash balances, reducing the opportunity for errors and increasing the ability to manage cash balances effectively."

"Stored Holdings enables our clients to determine how frequently to store a wide range of portfolio holdings information. This greatly increases the efficiency and speed with which PORTIA reports are generated and optimizes accessing data out of the PORTIA database," Bremner continued.

Stored Holdings provides the ability to periodically store portfolio holdings information, both positional information such as quantity and price, as well as analytical information such as book value and duration, to support improved reporting, accounting and data access. The new feature also includes enhancements to the PORTIA Report Writer, such as the ability to store and report on time series changes to security master file elements, date range reporting and report output to XML.

Cash Management supports improved accounting and record keeping of cash activity by supporting the ability to define cash balance rules, and Cash View component that supports looking at actual, contractual, current, future or projected cash balances, and more comprehensive support for short term investment vehicles

In addition to the new features, improvements have been made to core PORTIA to better support the growing requirements of its client base. These include:

1 Ability to further customize PORTIA by creating more User Defined Fields to meet unique data requirements
2 Enhanced batch processing to support greater flexibility in configuring PORTIA to handle the nightly cycle
3 Support for a much larger set of data that can be extracted out of PORTIA at one time

Thomson PORTIA is the investment industry’s most powerful and comprehensive portfolio management system, supporting transaction and positional record keeping, internal and external reporting, performance measurement, trade processing and settlement and security master file management for money managers in 40 countries. Thomson PORTIA is the book of records and hub for all portfolio activity used by 300 firms to manage 10 Trillion dollars worth of assets. It is fully integrated with Thomson PORTIA Trade EQ (formally known as Oneva Trade EQ), Thomson’s trade workflow and execution system, and Thomson PORTIA Perform, Thomson’s new performance measurement solution.

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