[0] Aether Systems and Euronet Worldwide Announce Availability of Mobile Finance By Aether.

OWINGS MILLS, Md. & LEAWOOD, Kan.--(BUSINESS WIRE)--May 17, 2001

Wireless Account Access and Event Messaging Service Offered for

Obtaining Secure Personal Information from Financial Institutions

Aether Systems, Inc. (Nasdaq:AETH), a leading provider of wireless data products and services, and Euronet Worldwide (Nasdaq:EEFT), a leading provider of secure electronic financial transaction solutions, today announced the availability of Mobile Finance by Aether(TM), a wireless solution that enables financial institutions to allow consumers to manage their finances any time, any place.

The wireless financial service features event messaging and account access, ensuring secure, real-time transactions and account activity alerts using mobile phones, interactive pagers and personal digital assistants (PDAs).

With Mobile Finance by Aether, banks, brokerages, credit unions and other financial institutions can extend customer access to account information across a variety of wireless devices. The service delivers personalized Event Messaging in the form of alerts prompted from customer-selected preferences.

Based on the customer's choices, it sends timely alerts to multiple types of wireless devices in addition to email addresses and fax machines. Event Messaging provides instant delivery of consumer-requested information such as an account reaching a minimum balance, deposit confirmation, transfer and withdrawal notifications; credit card limits reached or changing loan rates.

Account Access provides users with real-time transactions, such as viewing current balances and mini-statements, reporting lost or stolen credit cards, changing passwords, ordering checks, or requesting additional statements. The menu-driven application offers a secure link to multiple accounts with industry-standard security technologies and protocols.

"Real-time alerts and event messaging provides a compelling value to leading financial institutions. Offering these innovative services is key to staying competitive," said John Shepley, vice president, Financial Services Aether Systems. "By teaming with Euronet, Aether is offering a comprehensive, quick-to-market wireless service that can elevate the level of customer satisfaction for financial institutions, helping them to not only retain customers, but attract new customers as well."

Mobile Finance by Aether is designed to provide financial institutions with a comprehensive, hosted solution that can be operational within 90 days. By integrating a company's information systems with corresponding wireless devices, Euronet and Aether manage every aspect of deploying the service.

The service also includes secure, reliable high-performance connection to all major carriers through Aether's redundant data centers, 24-hour access to customer care teams, and detailed service level agreements.

"With consumers on the go more than ever before, managing financial accounts remotely via mobile phones is in high demand," said Michael Brown, Chairman and CEO, Euronet Worldwide. "Financial institutions need a solution like Mobile Finance by Aether that provides a flexible and strategic investment for the future. This product offers convenience, personalization and the expertise of two industry leaders: Aether and Euronet."

About Aether Systems Inc.

Aether Systems helps enterprise customers improve efficiency and profitability by providing the services, software and support necessary to extend existing and future business applications from the desktop to any wireless device.

Through Aether Fusion(TM), Aether's wireless enabling technology foundation, Aether develops, deploys and manages wireless solutions built on industry standard technology and backed by Aether's expertise in wireless hosting, software and services. Aether provides the business world with a single-source for reliable, scalable and cost effective wireless solutions.

For more information please visit www.aethersystems.com

About Euronet Worldwide

Euronet Worldwide is a global provider of secure electronic financial transaction solutions. The company provides financial payment middleware, financial network gateways, outsourcing, and consulting services providing banks, financial institutions, and mobile operators the ability to provide their clientele access to their personal financial information and perform secure financial transactions - any time, any place.

Arrowz(TM), the company's proprietary transaction management system, powers financial transaction solutions for over 250 clients in 60 countries as well as the company's processing centers located in the United States, Europe, and Indonesia.

The company owns and operates the largest independent ATM network in Europe with corporate headquarters in Leawood, Kansas, USA, and European headquarters in Budapest, Hungary. Additional information is available at the company's web site, www.euronetworldwide.com

This press release includes forward-looking statements based on current expectations and projections about future events. These forward-looking statements are subject to a number of risks, uncertainties and assumptions about Aether that could cause actual results to differ materially from those in such forward-looking statements.

Potential risks and uncertainties include, but are not limited to, the ability of Aether and Euronet to successfully integrate their technologies and business, the ability to offer services on a cost-effective basis and market acceptance of products developed by Aether and Euronet.

These risks and other risk factors are described in Aether's report on Form 10-K with respect to the fiscal year ending December 31, 2000 and other documents filed with the Securities and Exchange Commission. Aether undertakes no obligation to update the forward-looking statements contained in this press release.