ADVISORY/Portal CFO to Present at CIBC Communications & Technology Food Chain Conference.

Business Editors/High-Tech Writers

ADVISORY...for Monday (June 6)

CIBC Communications & Technology Food Chain Conference

--(BUSINESS WIRE)

Portal Software, Inc. (Nasdaq:PRSF)

WHAT: Howard Bain, chief financial officer of Portal Software, Inc. (Nasdaq:PRSF) will present at the CIBC Communications & Technology Food Chain Conference in New York City, on Monday, June 7, 2004 at 8:00 a.m. EDT. Mr. Bain will highlight Portal's flexible billing solutions and how they help companies manage revenue and optimize profitability.

CIBC will webcast the presentation. The webcast can be accessed at: http://www.veracast.com/webcasts/cibcwm/communications04/43101433.cfm

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.

WHEN: Monday, June 7, 2004

8:00 a.m. EDT

WHERE: The Plaza Hotel

New York City