European Operator Bouygues Telecom Adopts Fair Isaac's RoamEx Fraud Solution

Through the agreement, Bouygues Telecom joins a roster of 75 telecommunications networks worldwide that currently leverage the RoamEx network, the leading roamer visibility network, to exchange roaming data and grow their business. The RoamEx network will help Bouygues Telecom increase roaming revenues income gained while mobile phone users are roaming on the Bouygues Telecom network from foreign networks. It also will help the provider decrease fraud losses by providing roaming call detail records in near real-time.

"We selected Fair Isaac's RoamEx because of its reputation as the industry standard in providing timely roaming data throughout the wireless industry," said Jean Philippe Aumercier, Director, International Roaming at Bouygues Telecom. "RoamEx will help us become a more attractive serving network for roaming partners seeking the benefits a protected network provides. When roaming subscribers visit our network, RoamEx will deliver roaming call information immediately to the home network and address any fraud exposure."

Roaming fraud occurs when a subscriber who does not intend to pay moves from the home operator network to another operator network and takes advantage of the home operator's lack of visibility of subscriber activity. By automatically sending completed call detail records covering voice, message and data calls from the serving operator to the home operator within seconds, RoamEx provides wider visibility of a roaming subscriber and allows the home operator to identify and respond almost immediately to a potential fraud threat.

Fair Isaac's RoamEx Roamer Data Exchanger is the industry's only proven real-time roamer visibility network and serves as one foundation for Fair Isaac's suite of telecommunications applications to address fraud, credit risk management and account management decision making. RoamEx network handles 95 percent of all roaming call records for the North America wireless industry and currently processes over two billion call detail records every month around the globe for more than 75 wireless networks.

"The agreement with Bouygues Telecom represents another step in our mission to offer worldwide roaming visibility and fraud protection," said Mike Gandolfo, Vice President of Fair Isaac's Global Telecom solutions. "As we work to enhance the RoamEx product and expand network coverage into the European market, we look forward to delivering the most complete and comprehensive roaming data available to meet the needs of our clients' fraud defenses."

The RoamEx solution is designed to meet any wireless carrier's needs for near real-time exchange of roaming data to enhance revenue and guard against fraud and credit risk. Fair Isaac provides day-to-day management, monitoring, product maintenance and technical support for the RoamEx network, making the wireless carriers' resource commitment minimal.

About Bouygues Telecom
With 7.400 employees and 7,7 million customers, Bouygues Telecom has established itself as the company that democratized the mobile telephony market in France. Bouygues Telecom introduced mobile phone bundles to France in 1996, and continues to design useful, simple, high-quality and affordable products for both individual and business customers. As part of these efforts, the company launched i-mode mobile internet services in November 2002. Over 1,2 million Bouygues Telecom customers in France had signed up to i-mode, and were able to access more than 330 official sites, and 5.000 independent sites, offering practical information and exchange e-mails with messaging systems throughout the world. Bouygues Telecom is also one of the world's leading mobile phone operators, with more than 390 roaming agreements with operators. Since France is the first destination for tourism with more than 75 millions of visitors, roaming and fraud are major issues for Bouygues Telecom.

About Fair Isaac
Fair Isaac Corporation (NYSE:FIC) is the preeminent provider of creative analytics that unlock value for people, businesses and industries. The company's predictive modeling, decision analysis, intelligence management, decision management systems and consulting services power billions of mission-critical customer decisions a year. Founded in 1956, Fair Isaac helps thousands of companies in over 60 countries acquire customers more efficiently, increase customer value, reduce fraud and credit losses, lower operating expenses and enter new markets more profitably. Most leading banks and credit card issuers rely on Fair Isaac solutions, as do insurers, retailers, telecommunications providers, healthcare organizations and government agencies. Through the www.myfico.com Web site, consumers use the company's FICO^® scores, the standard measure of credit risk, to manage their financial health.

Statements Regarding Forward-Looking Information
Except for historical information contained herein, the statements contained in this press release that relate to Fair Isaac, including statements regarding its RoamEx product offering and the benefits to be derived from this offering, are forward-looking statements within the meaning of the "safe harbor" provisions of the Private Securities Litigation Reform Act of 1995. These forward-looking statements are subject to risks and uncertainties that may cause actual results to differ materially, including any unforeseen technical difficulties related to the implementation, use and functionality of the offering, the risks that customers will not perceive material benefits from the offering, failure of the products to deliver the expected result, the possibility of errors or defects in the offering, regulatory changes applicable to the use of consumer credit and other data, and other risks described from time to time in Fair Isaac's SEC reports, including its Annual Report on Form 10-K for the year ended September 30, 2004, and Quarterly Report on Form 10-Q for the period ended June 30, 2005. Forward-looking statements should be considered with caution. If any of these risks or uncertainties materializes or any of these assumptions proves incorrect, Fair Isaac's results could differ materially from Fair Isaac's expectations in these statements. Fair Isaac disclaims any intent or obligation to update these forward-looking statements.