| PKSI deal.......Primus and Imparto Software Sign Definitive Merger Agreement
 
 Strategic Combination to Provide Innovative eService Software for Both dot.com and Enterprise
 Customers
 
 SEATTLE--(BUSINESS WIRE)--Dec. 13, 1999--Primus (Nasdaq:PKSI - news), a leading provider of eService software
 and services, today announced the signing of a definitive merger agreement with privately held Imparto Software, Inc. of Palo
 Alto, Calif., a leading provider of eMarketing solutions.
 
 The strategic combination will create a leader in innovative eService and eMarketing software for both dot.com and enterprise
 customers. Under the terms of the agreement, Primus will acquire all outstanding stock of Imparto in exchange for one million
 shares of Primus common stock. The merger is intended to be a pooling-of-interests and is subject to approval by the
 shareholders of Imparto and other customary conditions. Executives of Imparto have agreed to vote their shares in favor of the
 proposed transaction. As a result of the transaction, Imparto will become a wholly owned subsidiary of Primus.
 
 The acquisition will enable Primus to expand and enhance the company's existing eService software and service offerings, such
 as Primus® Interchange, with the addition of the Imparto(TM) Web Marketing Suite. This combination will create a powerful
 link between the marketing focus before the sale and the critical issues encountered by those same users after the sale, forming
 the eService cycle essential to successful eBusiness. All of the key contact points between customer and business can be
 integrated through the Primus eService software infrastructure.
 
 The combined companies will have approximately 225 employees worldwide and more than 85 customers that span the new
 economy from dot.com startup to Global 2000 enterprise, including such progressive companies as 3M, 3Com, Brio
 Technology, Cirrus Logic, Compaq, Fair Isaac, GTE Internetworking, New Century Mortgage and Novell.
 
 ''The market is quickly realizing that the success of eBusiness depends on world-class eService being delivered to online
 customers at every stage in their lifecycle, along with measurable ROI for the company. With this acquisition, Primus will be
 able to extend our eService software infrastructure from the marketing department through to the support center,'' said Michael
 Brochu, Primus president and CEO. ''The combination of Primus and Imparto will allow businesses to have an integrated
 software suite that manages all of the essential contact points with the online customer, in both business-to-business and
 business-to-consumer environments, and sets new standards for eService.''
 
 ''This acquisition will create exceptional value for the employees, shareholders and customers of both companies,'' said Dan
 Rudolph, president and CEO of Imparto. ''Primus and Imparto have both realized that the promise of eService needs
 something beyond simple email routing and stand-alone marketing campaigns to be truly successful. Our complementary
 product families both deliver on this promise and stand out in the market due to their powerful underlying technology and strong
 focus on value creation.''
 
 Primus Provides Complete eService Software Infrastructure
 
 Primus® Interchange is the first eService solution to allow both sides of the eBusiness transaction -- business and customer --
 to receive real value from every interaction. With Primus Interchange, a user submits an email inquiry, and the system
 automatically searches the knowledgebase and returns an email message that both contains suggested answers to the user's
 question and performs intelligent routing on the backend. The product couples these eService capabilities with the Primus®
 Associative Search Engine to deliver fast, accurate answers to users, and capture that information for use by the company in the
 future. Alternatively, users may opt to search the customer service knowledgebase directly through the company's web site. All
 self-service options are available 24 hours a day, seven days a week.
 
 The Imparto(TM) Web Marketing Suite provides an end-to-end integrated solution for creating content and managing
 personalized marketing campaigns to precisely targeted audiences along with building and maintaining a powerful web
 marketing database. The software suite includes the following components:
 
 --   Imparto(TM) Programs: to manage email and other online
 marketing campaigns
 
 --   Imparto(TM) Audience: to segment customers and learn more
 about them
 
 --   Imparto(TM) Website: to create and maintain content for a
 website
 
 --   Imparto(TM) Reporter: to create reports for tracking
 effectiveness and ROI
 
 --   Imparto(TM) Administrator: to customize the Imparto Suite to
 meet specific needs
 
 The Imparto Web Marketing Suite drives eMarketing that moves beyond the opportunity to just sell and focuses on the
 opportunity to enable a relationship between business and customer.
 
 About Imparto
 
 Imparto is a leading provider of B2B mid-market solutions for building relationship-enabled websites that drive customer
 acquisition and customer satisfaction. Based in Palo Alto, Calif., Imparto has provided applications and services for the web
 infrastructure since its founding in 1995. Privately held, principal investors in Imparto include: Aspen Ventures, Athena
 Technology Ventures, GCI Technology and Red Rock Ventures. For more information, please visit www.imparto.com.
 
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