Press Release

Media Contact:
Amy Swanson
OutCast Communications
(415) 392-8282
aswanson@outcastpr.com

Zimbra Named a Red Herring 100 Winner

Red Herring Recognizes Zimbra as one of the 100 Private Technology Firms in North America Driving the Future of Technology

SAN MATEO, CA - May 22, 2006 - Zimbra (http://www.zimbra.com), a leader in open source, next-generation collaboration and messaging, today announced that it has been selected as a winner of the annual "Red Herring 100 North America" award by Red Herring magazine. This list of 100 privately held companies in North America recognizes those that play a leading role in innovating in the technology business. To view the full list, please visit www.redherring.com.

As one of the winners, Ross Dargahi, Co-Founder and VP of Engineering at Zimbra, will present the company at the exclusive Red Herring Spring 2006 CEO summit, May 23-25 in Monterey, California, where a select group of 300 technology entrepreneurs, investors, and corporate developers will gather to be the first to meet this next wave of disruptive technology companies.

Disruptive Technologies and Business Plans

"With venture capital flowing again, we're seeing a lot of innovative new companies taking on the established players with disruptive technologies and innovative business plans," said Joel Dreyfuss, Editor-in-Chief of Red Herring. "The Red Herring 100 North America companies, among them Zimbra, are pushing and breaking the boundaries of the technology business and we are excited to report on their success stories."

"Since its inception Zimbra has worked to solve the most frustrating collaboration problems for IT Administrators and users," said Ross Dargahi, Zimbra Co-Founder and VP of Engineering. "It is an honor that Red Herring has recognized Zimbra as one of the Top 100 Private companies driving technology; this award continues to validate the investment that our customers have made in deploying hundreds of thousands of mailboxes on Zimbra."

Zimbra's flagship product, the Zimbra Collaboration Suite (ZCS) is an open source, enterprise collaboration system that reduces the cost and complexity of collaboration, and changes the way users and administrators interact with their e-mail and calendaring applications. On the back end, the ZCS includes integrated search, single-copy mail store, discovery, anti-spam and anti-virus/security capabilities; on the front end, a rich, full-featured, AJAX-based Web client brings e-mail and calendar items to life through Web mash-ups.

More Than Just Buzz

Red Herring's lists of top private companies are an important part of the renowned magazine's tradition of identifying new and innovative technology firms and entrepreneurs. Companies like Google and eBay were spotted in their early days by Red Herring editors as some that would change the way we live and work.

After receiving more than 1,000 submissions and nominations, Red Herring's editorial staff rigorously evaluated Zimbra and the other contenders through a careful analysis of financial data and subjective criteria, including quality of management, execution of strategy, and dedication to research and development. The Red Herring 100 North America companies are at the forefront of the technologies that are changing our lives in profound ways.

Honoring the Best

To honor the Red Herring 100 companies, Red Herring has invited their CEOs and founders to present at its Red Herring Spring 2006 conference, a forum for technology's most exciting companies, and to share their insights on the future of innovation and the entrepreneurial journey. Scheduled to take place at the Hyatt Regency Hotel in Monterey, this intimate, invitation-only conference will explore "The Pursuit of Disruption" and how it spawns unexpected opportunities, novel alliances, and great success stories.

About Zimbra

Zimbra dramatically improves the messaging and collaboration experience for administrators and users. Zimbra achieves this by investing in innovation, open source, and compatibility with existing applications and systems. The Zimbra Collaboration Suite supports Windows, Apple, and Linux platforms and works with Microsoft Outlook as well as other PC and mobile clients. Additionally, Zimbra provides an AJAX browser based client that delivers rich, secure, anytime access for anyone within the enterprise. More information and software downloads are available at www.zimbra.com.

About Red Herring Spring 2006

Red Herring Spring 2006 will assemble 300 of the continent's most innovative and successful CEOs, investors, and corporate developers and feature a dynamic group of over 100 speakers that are pushing and breaking the boundaries of the business of technology. Themed "The Pursuit of Disruption," it will be held May 23-25 in Monterey, California. Please contact Michael Felber at 650.428.2900 or email mfelber@redherring.com to request an invitation to attend the event. More information is available online at www.herringevents.com/rhspring06.

About Red Herring Magazine

Red Herring magazine is a sophisticated insider's guide to the business of technology, featuring unparalleled insights on the emerging technologies driving the economy, from the Internet to wireless communications and digital entertainment. Red Herring's journalists report on how innovation and entrepreneurship are transforming business and how the business of technology is transforming the world, providing readers with a deep understanding of venture capital and capital markets. Recognized as an essential resource in today's fast-changing business world, Red Herring gets the right answers before anyone else even thinks to ask the questions. More information on Red Herring is available on the Internet at www.redherring.com.

Red Herring Spring contact: Michael Felber, mfelber@redherring.com
Media Relations contact: Xenia von Wedel, xenia@terpin.com