Portal Software Implemented for Convergent Prepaid and Postpaid Billing

CUPERTINO, CA (December 9, 2003) ? Portal Software, Inc. (Nasdaq: PRSF) today announced that Orange UK (www.orange.com), has implemented Portal?s convergent content billing solution to drive increased revenue from content, data, and messaging services. Orange, the United Kingdom?s most popular mobile service with over 13 million customers, now uses Portal?s billing solution. Orange UK is using Portal?s solution to generate additional revenue by rapidly supporting value-based pricing for a wide variety of prepaid and postpaid services as well as quickly increasing the number of third-party partner relationships.

Lucien Ducorney, Vice-President of Customer Systems at Orange Group, has welcomed the implementation as a step in the fulfillment of Orange?s stated ambition to establish a range of leading-edge systems consistently across its territories. Didier Lebrat, Vice-President Technical at Orange UK, said, ?Portal?s proven content solution enables us to rapidly expand our content community by giving third-party partners the competitive, differentiated, and auditable service they need to sell their content over our network. Portal solutions also give Orange UK a low-risk way to support the flexible and intuitive charging models we need to encourage the rapid trial and adoption of new services.?

Portal?s services group worked closely with Orange UK to provide the rich rating functionality needed to drive the company?s content services business in a way that effectively reduced custom development overhead. By integrating with the existing billing infrastructure, Portal billing solutions enabled Orange UK to rapidly deploy in a phased implementation that will be leveraged in other parts of the Orange business. By employing this coexistent approach technical risks and impacts were reduced, while meeting fixed time and pricing requirements.

?Orange UK needed a billing solution that would enable them to quickly support event-based charging for a variety of convergent prepaid and postpaid content services,? said Alan Laing, vice president general manager of EMEA at Portal Software. ?Portal solutions provided the real-time features to allow Orange UK to effectively manage revenue from content, data, and messaging services, including advice of charge, real-time control of spending limits, and automated revenue sharing.?

Today?s announcement reinforces the Orange commitment to using the most innovative and flexible solutions for content billing, while also highlighting the tremendous impact that value-based pricing models can have in helping providers in that market to meet revenue goals. Orange UK joins Orange Netherlands and Orange Romania as Portal customers within the Orange Group.

About Orange UK.

Orange, wirefree and any other Orange product or service referred to in this release are trademarks of Orange.

Orange UK provides high quality coverage to 99% of the UK population, and offers roaming to pay monthly customers on 288 networks in 128 countries and to pay-as-you-go customers on 28 networks in 22 countries.

At the end of September 2003, Orange UK had over 13.3 million active customers, more than any other UK network, making it the UK?s number one.

In October 2003, Orange UK won the Mobile Choice Consumer Awards - voted for by readers of Mobile Choice magazine ? for Best Network Operator for the third year running, and for Best High Street Retailer.

The sixth annual J.D. Power and Associates UK Mobile Customer Satisfaction Study published in June 2003 showed that Orange ranks as the number one telephone service for customer satisfaction in the contract sector in the UK. J.D. Power and Associates 2002-2003 United Kingdom Mobile Customer Satisfaction Study based on a total 2,111 consumer responses. Orange was ranked number one in 1998, 1999, 2000 and 2001, when the contract and prepay sectors were combined, and was ranked first in the contract sector in 2002 and 2003.

Information about Orange can be found on the Orange website at www.orange.co.uk and media information can be found at http://www.orange.com.

For further information, call the Orange media centre on 020 7984 2000 or 07973 201911.

About Portal Software, Inc.

Portal Software provides flexible billing and subscriber management solutions to enable organizations to monetize their voice and digital transactions. Portal?s convergent billing platform enables service providers to charge, bill, and manage a wide range of services via multiple networks, payment models, pricing plans, and value chains. Portal?s flexible and scalable product-based solutions enable customers to introduce new value added services quickly, providing maximum business value and lower total cost of ownership. Portal?s customers include thirty-five of the top fifty wireless carriers as well as organizations such as Vodafone, AOL Time Warner, Deutsche Telekom, TELUS, NTT, China Telecom, Reuters, Telstra, China Mobile, Telenor Mobil, and France Telecom. For more information, please visit http://www.portal.com.