London, UK, 20th June 2003 — OneSource Information Services Limited, a leading provider of business information solutions, today launched a new edition of its market-leading Business BrowserSM product line specifically designed for the UK technology sector. The new product, Business Browser UK / Technology Edition, will include detailed information on IT executives, as well as IT and telecoms infrastructure, for more than 25,000 UK public and private sector organisations. This information will help technology companies win more and higher value business, and cut costs through improved prospecting, pitching and cross-selling.

Business Browser UK / Technology Edition provides detailed IT and telecoms profiles, including spending levels, volumes of hardware and software and associated suppliers. This includes details on desktops, laptops, WANs and LANs, communications equipment, operating systems, CRM systems and broadband capability. These profiles enable IT sales and marketing professionals to target companies that would most benefit from their products and services.

According to Joe Tarragano, Product Marketing Director at OneSource, “In this selling environment, sales representatives are pushing for any possible competitive edge in maximising revenue from existing customers and acquiring new accounts.”

“We are giving sales professionals new insight into the technology infrastructure of their accounts, and a map of their customers’ key IT decision-makers, allowing them to improve the effectiveness of prospecting, winning and maintaining new business,” he concluded.

IT and telecoms companies can further improve sales and marketing productivity by integrating OneSource® content directly into their internal processes and business applications. Using the OneSource Content Optimisation ServicesSM , they can improve the quality, consistency and organisation of data from various marketing and sales applications by linking disparate internal data sources and connecting them to the OneSource Enhanced Information WarehouseTM repository. They can then seamlessly deliver external business information—company profiles, executives, research reports, news—from the OneSource Enhanced Information Warehouse through key customer support applications, such as customer relationship management (CRM) systems or portals.

The Business Browser UK / Technology Edition aggregates content from VNU and CorpData, two leading and well-regarded suppliers of critical IT data. This must-have information is blended with existing content from the OneSource enhanced information warehouse as part of OneSource’s strategy of delivering industry-focused solutions and complements the company's recently introduced Business Browser UK / Professional and Financial Services Edition.

OneSource today also announced a major enhancement to its U.S.-focused Business Browser products for those organizations that target and service IT departments in North America. This enhancement adds more than 18,000 IT profiles and 30,000 IT executive contacts

Pricing and Availability
OneSource Business Browser UK / Technology Edition is available immediately at a fixed annual subscription per registered user. For further information visit www.onesource.com or call 0207 367 5757.

About VNU
VNU Business Information Europe is a leading UK publisher of technology news,
product reviews, periodicals, and company profiles in print as well as on the web.
CSSOnline is produced by VNU Database & Directories, a part of vnunet.com.
For the past 30 years they have been collecting and publishing high-quality information about the UK IT industry.

The Computer Software and Services database currently contains over 8,000 company
profiles, with 14,600 software products and 13,000 named contacts. The Datasite database provides IT profiles and contact details for over 13,000 end-users of IT hardware and software in the UK. These databases are used to produce the "industry bibles" The Computer Users Year Book and The Software Users Year Book.

About Corpdata
Corpdata provides high quality telephone researched marketing data. Founded in 1992, Corpdata provides around 90,000 UK companies covering 250,000 decision making contacts. Data research operates on a 6 monthly update cycle, yielding an average data age of 3 months.

Contacts are provided at both head office and branch level. Corpdata offers an expanding range of services in addition to executive contact information, including marketing databases, practical database support services, bespoke research and services for publishers

About OneSource Information Services
OneSource, a recognised leader in business information solutions, delivers unparalleled company, executive, and industry intelligence that make business professionals more effective and productive in completing their critical daily tasks. OneSource products and services support a company's vital business processes including serving their customers, finding and leveraging new opportunities, and managing suppliers and partners.

OneSource combines and organises content from over 2,500 information sources supplied by more than 30 world-class content providers creating an unequalled information resource encompassing corporate families, industries, executives, financials, news, analyst reports, and trade and business press articles. Using its Global Business Taxonomy system, OneSource links this in-depth information on over 1.7 million companies worldwide resulting in the most extensive company-linked repository of business information in the world.

Users of OneSource products work faster, smarter, and more productively, whether leveraging OneSource business information through the Web-based OneSource Business Browser product line or through enterprise applications or portals integrated seamlessly via the OneSource AppLink SDK.
OneSource is headquartered in Concord, MA, with offices located in North America, Europe, and the Pacific Rim. Product information is available at www.onesource.com . Customers include American Express, Avaya Communications, Bank One, Chubb, Citibank, Cisco, Hewlett Packard, Deloitte & Touche, i2 Technologies, Orange, Royal & Sun Alliance, SAS Institute, Securicor, Sun Microsystems, and Williams Communications.

OneSource, Business Browser, Content Optimization Services,Global Business Taxonomy, Enhanced Information Warehouse, AppLink, and/or other OneSource product and service names referenced herein are either trademarks or service marks or registered trademarks or service marks of OneSource Information Services, Inc. or its subsidiaries in the United States and/or other countries. All other product and service names mentioned herein are trademarks or service marks of their respective owners.

This news release contains certain forward-looking statements that are based on the current beliefs and expectations of OneSource’s management, as well as assumptions made by, and information currently available to, OneSource’s management. Such statements include, but are not limited to, those regarding the functionality and effectiveness of OneSource products and services and OneSource’s competitive position. Because such statements involve risks and uncertainties, actual actions and strategies and the timing and expected results thereof may differ materially from those expressed or implied by such forward-looking statements, and OneSource’s future results, performance, and achievements may differ materially from those expressed in, or implied by, any such forward-looking statements. Such risks include, but are not limited to, OneSource’s reliance on generating revenues from its Web-based product line; political, economic, and business fluctuations in domestic and international markets; and competition in the business information products and services industry. In addition to the factors noted above, other risks, uncertainties, assumptions, and factors that may affect OneSource’s financial results are described in the company’s recent filings with the United States Securities and Exchange Commission, including OneSource’s Annual Report on Form 10-K for the fiscal year ended December 31, 2002.