Baltimore, Md. – January 27, 2004 – Thomson Prometric, the global leader in technology-enabled testing and assessment services and part of The Thomson Corporation (NYSE: TOC; TSX: TOC), and Citrix Systems, Inc., (Nasdaq: CTXS), the global leader in access infrastructure solutions, today announced the renewal of their agreement under which Thomson Prometric exclusively provides Citrix comprehensive certification testing services.  These testing services include test taker scheduling and registration, test development, data management, Internet-based test delivery and proctored testing through Thomson Prometric's global testing center network.

Citrix has four certification programs: Citrix Certified Administrator^TM (CCA), Citrix Certified Enterprise Administrator^TM (CCEA), Citrix Certified Sales Professional^TM (CCSP) and the recently launched Citrix Certified Integration Architect^TM (CCIA).  To date, more than 50,000 Citrix certifications have been achieved worldwide.

"Thomson Prometric has been key in our ability to provide relevant, targeted and flexible certification programs to meet the evolving needs of our certified professionals," said Karl Liebman, director of corporate education and consulting for Citrix.  "For years, we've successfully partnered with Thomson Prometric as our one source for program delivery, and we look forward to the continued partnership."

As part of the agreement renewal, Thomson Prometric and Citrix will broaden their business relationship to include various cooperative marketing initiatives to grow the Citrix certification program.  These initiatives include adding a Citrix presence on www.prometric.com and collaboratively creating case studies for the industry.

"No other company can equal the experience of Thomson Prometric in successfully delivering programs for the certification industry," said Alison Indrisano, senior vice president of Client Services and Support.  "We are focused on offering comprehensive testing services to all 300 of our clients.  Citrix's decision to maintain an exclusive relationship with Thomson Prometric attests to our strength as the market leader in testing services." 

Citrix recently updated its technical and sales certification programs to support the Citrix® MetaFrame® Access Suite.  The updated programs are designed to facilitate training and certification on all products and technologies in the suite, which includes Citrix MetaFrame Presentation Server, Citrix MetaFrame Secure Access Manager, Citrix MetaFrame Password Manager and Citrix MetaFrame Conferencing Manager.   

Registration for Citrix certification exams is available on www.prometric.com.  For more information about Citrix certification requirements, please visit www.citrix.com/edu.

About The Thomson Corporation and Prometric
The Thomson Corporation (www.thomson.com), with 2002 revenues from continuing operations of $7.5 billion, is a global leader in providing integrated information solutions to business and professional customers. Thomson provides value-added information, software tools and applications 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. With operational headquarters in Stamford, Conn., Thomson has approximately 43,000 employees and provides services in approximately 130 countries. The Corporation's common shares are listed on the New York and Toronto stock exchanges (NYSE: TOC; TSX: TOC). Its learning businesses and brands serve the needs of individuals, learning institutions, corporations and government agencies with products and services for both traditional and distributed learning. 

Thomson Prometric (www.prometric.com) is the global leader in technology-enabled testing and assessment services for information technology certification, academic admissions and professional licensure and certifications. Thomson Prometric delivers standardized tests for 300 clients, in 26 languages, over the Web or through a global network of testing centers in 134 countries. Based in Baltimore, Md., Prometric employs 3,000 employees worldwide.

About Citrix Education

Citrix Education offers professional training courses through Citrix Authorized Learning Centers (CALCs) around the world, as well as through eLearning.  Using Citrix Professional Courseware, industry professionals can obtain the sales skills to sell and position, as well as the technical skills necessary to establish and support the Citrix MetaFrame Access Suite.  Citrix technical certifications, including Citrix Certified Administrator (CCA), Citrix Certified Enterprise Administrator (CCEA) and Citrix Certified Integration Architect (CCIA) offer technicians the tools they need to address the complete IT project lifecycle -- including design, analysis, build/test, rollout and support.  The Citrix sales certification, Citrix Certified Sales Professional (CCSP), offers salespeople the tools they need to sell and position the Citrix MetaFrame Access Suite. Citrix certifications have been ranked among the industry's leading certifications in surveys such as CRN's 2002 Salary Survey and 2003 Certification Study, Microsoft Certified Professional Magazine's 2002 Salary Survey and CertCities' "Hottest Certifications of 2003." 

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