Portal Software Announces 2005 Customer Satisfaction Survey Results; 85% of Customers Say They Intend to Repurchase

  Product Quality and Company Relationship Key to Customer Approval;
  Company Calls for Industry Transparency into Customer Satisfaction

   Portal Software, Inc. (Nasdaq:PRSFE), the premier global provider
of billing and Revenue Management solutions, today announced the
results of its semi-annual customer satisfaction survey. The survey,
conducted by TNS Prognostics, a global leader in customer
research-based consulting, found that more than 85 percent of Portal
customers using versions of Portal's platform version 6.2 and greater
intend to repurchase -- or upgrade to -- newer versions of the Portal
platform. (Note: version 6.2 was available to customers beginning in
December 2001.).
   Respondents cited product quality and Portal's relationship as the
main drivers of their intention to repurchase.
   "Portal's platform approach allows us the agility, stability and
scalability to capture new revenue and market opportunities as we
identify them," said Joost Eringfeld, head of Billing Domain at
Swisscom Mobile. "We see Portal not merely as a technology vendor but
rather as a mission-critical partner in maximizing our revenue
relationships."
   While customer surveys are more common in mature industries such
as hardware, operating and database systems, Portal believes it is
time to gather, monitor and communicate customer satisfaction levels
in the billing and Revenue Management market.
   "With this announcement, Portal is definitively taking aim at the
billing industry's Achilles heel -- customer satisfaction," said Paul
Hughes, director and senior telecom analyst at Yankee Group. "As
convergence becomes more and more of a business reality, billing and
revenue management solutions will be increasingly critical to
providers' competitive strength. As a result, customer satisfaction,
along with time-to-market and functionality, will emerge as the key
differentiators for revenue management solutions."
   In February, Portal announced the availability of Portal 7, a
single platform that enables service providers to manage revenue on
any type of network: real-time IP and circuit-switched, fixed and
mobile, voice and data. The Portal 7 platform integrates and optimizes
every stage of the Revenue Management lifecycle: revenue generation,
capture, collection, and analysis. With Portal 7, service and content
providers are able to deliver services that are optimally priced for
their businesses, customers, and partners. Portal 7 ensures all
transactions are captured, rated, discounted, and charged, and that
bills are generated accurately and revenues collected.
   "Customer satisfaction in this market has historically remained a
low priority -- sacrificed for the sake of customization. With the
advent of product-based solutions, customers should not be required to
sacrifice satisfaction for functionality," said Dave Labuda, CEO of
Portal Software. "We fundamentally believe that today's
hyper-competitive telecommunications market demands that carriers and
content providers evaluate their billing and revenue management
solutions through a lens similar to that of a CRM or ERP system, where
customer satisfaction is a key metric."

   Methodology

   TNS Prognostics, a global leader in customer research-based
consulting, surveyed 225 technology support, business owners and
executives representing 120 Portal customers. The survey was conducted
online from February 23-March 11, 2005. Portal has measured its
customers' satisfaction at 14 intervals over the past eight years in
an effort to enhance its products, services and support programs.

   About Portal Software, Inc.

   Portal is the leading worldwide provider of billing and Revenue
Management solutions for the global communications and media markets.
The company delivers the only platform for the end-to-end management
of customer revenue across offerings, channels, and geographies.
Portal's solutions enable companies to dramatically accelerate the
launch of innovative, profit-rich services while significantly
reducing the costs associated with legacy billing systems. Portal is
the Revenue Management partner of choice to the world's leading
service providers, including Vodafone, AOL Time Warner, Deutsche
Telekom, Telstra, NTT, China Telecom, Reuters, China Mobile, Telenor
Mobil, and France Telecom.

   Forward Looking Statement

   Statements in this release regarding a customer's intent to
repurchase are forward looking statements that involve uncertainties
and risks. These and other factors are described in detail in our
Annual Report on Form 10-K for the fiscal year ended January 31, 2004
and our quarterly reports on Form 10-Q. All statements made in this
press release are made only as of the date set forth at the beginning
of this release. Portal undertakes no obligation to update the
information in this release in the event facts or circumstances
subsequently change.

   (C) 1996-2005. PORTAL and the PORTAL LOGO are trademarks or
registered trademarks in the United States and in other countries, all
owned by Portal Software, Inc. or its subsidiaries. Marks or names
owned by other companies remain the property of their respective
owners.