ADVISORY/Portal to Hold eSeminar on Mobile Number Portability; Portal's Solution Enables Service Providers to Maximize Revenue and Foster Customer Loyalty.

Business Editors/High-Tech Writers

ADVISORY...for Wednesday (Feb. 18)

--(BUSINESS WIRE)

    WHAT: Portal Software, Inc. (Nasdaq:PRSF) will be holding an
          eSeminar on the topic of Mobile Number Portability (MNP) on
          Wednesday, February, 18, 2004 at 11:00 a.m. PST. Portal's
          free eSeminar is designed to educate service providers
          about:

          - Maximizing revenue by administering customer data

          - Building customer loyalty and satisfaction with MNP

          - Increasing process efficiency

          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 www.portal.com.

    WHEN: Wednesday, February, 18, 2004 at 11:00 a.m. PST

    TO REGISTER:

    http://www.portal.com/seminars/mnp/