Thomson Financial and Vestmark Partner to Deliver Value-Adding Enhancements to PORTIA

NEW YORK - June 18, 2003 - Thomson Financial, an operating unit of The Thomson Corporation (NYSE: TOC - News; TSX: TOC - News) and a leading provider of information and technology solutions to the worldwide financial community, today unveiled a series of technology solutions for PORTIA clients developed in partnership with Vestmark, an enterprise software company serving the financial services industry. Leveraging Vestmark technology and capabilities in areas like system replication and workflow automation, these products provide a new level of scalability, flexibility, and operational efficiency to PORTIA installations worldwide. PORTIA is the investment industry's most powerful and comprehensive portfolio management system, automating the trading, analysis, and operations of money managers in 40 countries. Under the partnership, Thomson Financial is making four Vestmark technology solutions available to PORTIA clients, including:

• PORTIA Power Pack: A solution that utilizes Vestmark replication and process automation technologies to achieve unprecedented PORTIA throughput and system performance by distributing batch processes and reallocating workload across replicated PORTIA environments. The PORTIA Power Pack has been tested against a database of over 400,000 accounts and 60 million transactions and has been shown to accelerate mission-critical PORTIA tasks by up to seven times.
• PORTIA Process Manager: A browser-based tool giving PORTIA users the ability to manage distributed processes via a single operational dashboard. The PORTIA Process Manager supports real-time process monitoring and exception handling and offers remote alerting capabilities.
• PORTIA Hotsite Synchronizer: A disaster recovery solution which utilizes Vestmark's replication technology to create fail-safe business continuity for PORTIA clients.
• Java LiveSpace Adapter: A message-based integration solution thatprovides bi-directional, real-time integration with internal andexternal systems.

Responding to the dynamic needs of PORTIA clients, Thomson Financial worked collaboratively with Vestmark over a period of eighteen months to develop these solutions, which incorporate valuable input gathered from PORTIA clients in the development process. "These products are the result of extensive cooperation between our respective technology teams," said David Blundin, CEO of Vestmark. "We are very enthusiastic about making them available to the PORTIA community." Thomson Financial is releasing these products to PORTIA clients globally. The offerings will be jointly implemented using solutions professionals from both Thomson Financial and Vestmark who will customize each installation to the specific needs of the client. "Our partnership with Vestmark gives clients the ability to truly harness the power of PORTIA in ways previously unattainable," said Suresh Kavan, president of Thomson Financial's Investment Management Group. "These solutions extend PORTIA's capabilities to address the emerging needs of our clients."

PORTIA named the best portfolio management system by Celent Communications in 2002 -- gives users the benefit of real-time trade updates and powerful calculation logic for portfolio management reporting and pre-to- post trade compliance. It is interoperable with Oneva Trade EQ -- Thomson's trade workflow and execution system that completely automates trading, modeling, and order allocations for buy-side traders and portfolio managers worldwide.

PORTIA offers the following features:

• Flexible reporting -- PORTIA enables users to store, extract, calculate, and present information in any way they or their clients need.
• Support for all security types -- PORTIA handles all security types, from common stocks and simple bonds to complex options, floating rate, capitalized and inflation-adjusted securities, and mortgage-backed securities.
• Multi-currency capabilities -- PORTIA allows users to track base currencies at the system, portfolio, and securities level. Trades maybe settled and reported in any currency.
• Performance -- PORTIA offers a comprehensive range of performance measurement options to give users complete flexibility in the reporting and analysis of portfolio returns.
• Real-time processing -- Portfolio managers, traders, and operations staff all have simultaneous access to consistent portfolio information. From portfolio analysis to tracking available cash to invest, all information is up to the minute so users can make the most informed decisions.
• Open system architecture -- PORTIA links users to industry-leading data sources for security prices, corporate actions, and descriptive data, and offers open import, export and relational database capabilities to provide greater control in connecting with other in-house systems.

About Thomson Financial:
Thomson Financial is a US$1.5 billion 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 leading provider of value-added information, software applications and tools to more than 20 million users in the fields of law, tax, accounting, financial services, higher education, reference information, corporate training and assessment, scientific research and healthcare. The Corporation reported 2002 revenues of US$7.8 billion and its common shares are listed on the Toronto and New York stock exchanges (TSX: TOC - News; NYSE: TOC - News).

About Vestmark

Headquartered in Wakefield, Mass. and founded in 2001, Vestmark is a leading provider of portfolio management solutions and outsourced services for financial institutions and their advisors, enabling them to efficiently manage customized client portfolios through an innovative technology platform. Supporting over $1.5 trillion in assets and 5.5 million accounts, Vestmark is a partner to some of the largest and most respected wealth management firms. For more information about Vestmark’s solutions, call (781) 224-3640 or visit www.vestmark.com.

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