ADP to Implement Marimba's Castanet in Automotive Retail.

MOUNTAIN VIEW, Calif.--(BUSINESS WIRE)--Aug. 24, 1999--

Castanet's Bandwidth Efficiency, Remote Management, Application

Self-Healing, and Personalization Critical in

Building e-Business Infrastructure

Marimba(R), Inc. (Nasdaq:MRBA), a leading provider of Internet-based software management solutions, today announced that the ADP Dealer Services Group of Automatic Data Processing, Inc. (ADP (R)), a leading provider of integrated computing solutions, has chosen Marimba's Castanet as an integral component of its e-business strategy.

"Castanet's bandwidth efficiency, remote asset management, data distribution and self-healing capabilities are essential to the success of our e-Business strategy in automotive retail," said John Gray, senior vice president, Marketing and e-Business at ADP. "With Castanet, we will be able to deliver a wide range of services to motor vehicle dealers via the Internet."

Castanet's bandwidth efficiency allows companies to leverage the Internet more effectively for the delivery of applications and services. With Castanet, systems administrators can set cache parameters, file compression and the percentage of bandwidth allocated for application distribution. When updates occur, Castanet sends only the changes, rather than the entire application, conserving network bandwidth and minimizing download time.

Remote asset management includes Castanet's Inventory Suite, which provides the ability to discover, track and manage the current state of desktop, server and portable computing resources, even if the systems are only connected intermittently to a network. Using the Inventory Suite, systems administrators can more accurately plan system upgrades, application roll-outs and support programs.

In addition, Castanet provides remote diagnostics to help in trouble-shooting and testing Castanet deployments from a central location.

Castanet's application self-healing functionality provides the ability to automatically restore applications, which may have been damaged or inadvertently modified, to their proper working condition. Application self-healing can be configured to occur automatically, or be accessed remotely by help desk personnel. This functionality is critical in reducing the overall support burden.

Castanet's integrated management infrastructure will enable ADP to lower the cost and complexity of distributing, managing, and updating applications and services across different computer platforms and networks.

About ADP

ADP Dealer Services Group is a leading provider of integrated computing solutions to motor vehicle manufacturers and more than 19,000 auto and truck dealers throughout the United States, Canada, Europe and Latin America. The Dealer Services Group is the third largest business unit of Automatic Data Processing, Inc. (NYSE:AUD). With more than $5 billion in annual revenue and more than 450,000 clients, ADP is one of the largest independent computing services firms in the world.

About Marimba

Marimba is a leading provider of Internet-based software management solutions that enable companies to expand their market reach, streamline business processes and strengthen relationships with customers, business partners and employees. Marimba's Castanet product family provides an efficient and reliable infrastructure by which enterprises can distribute, update and manage applications and related data over corporate intranets, extranets and the Internet.

Depended upon by such organizations as The Home Depot, Intuit, and Seagate Technology, Castanet enables companies to leverage the Internet more efficiently by reducing software management costs, delivering greater functionality and improving customer loyalty. Marimba is headquartered in Mountain View and can be reached at 650/930-5282, [e-mail], or at its Web site at http://www.marimba.com.

This press release contains forward-looking information within the meaning of Section 21E of the Securities Exchange Act of 1934, and is subject to the safe harbors created by this section. These forward-looking statements concern, among other things, our announced customer's planned deployment of Castanet; the technical benefits our customer expects to achieve with Castanet; and the cost savings the customer expects to receive from using Castanet. Those results are subject to a number of risks and uncertainties, including: the remaining effort required to complete the customer's deployment and other technical, business and expense factors particular to the customer that could impact whether the customer is able to achieve expected technical benefits or cost savings with Castanet. Actual results may differ materially due to these and other factors. The matters discussed in this press release also involve risks and uncertainties described from time to time in Marimba's filings with the Securities and Exchange Commission. In particular, see the Risk Factors described in Marimba's final Prospectus dated April 29, 1999 for its initial public offering as well as its most recent Quarterly Report on Form 10-Q. Marimba assumes no obligation to update the forward-looking information contained in this press release.

Note to Editors: Marimba and Castanet are registered trademarks of Marimba, Inc. in the U.S. and/or other countries. ADP is a registered trademark of ADP of North America, Inc. All other product, trademark, company, or service names mentioned herein are the property of their respective owners.