Press Release

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Amy Swanson
OutCast Communications
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aswanson@outcastpr.com

Zimbra Named By Business 2.0 as a Next Net 25 Company for Zimbra Collaboration Suite

An Honoree in Next Net 25's 'Webtop' Category, Zimbra Collaboration Suite Is Recognized as One of the Leading Providers in Next Generation Web-Based Collaboration

SAN MATEO, CA - MARCH 29, 2006 - Zimbra, a leader in open source next-generation collaboration and messaging, announces that Zimbra has been named as a Next Net 25 company by Business 2.0. Recognized in the "Webtop" category, the Zimbra Collaboration Suite was lauded as the leading provider in next generation Web-based collaboration and messaging. The Zimbra Collaboration Suite is an open-source enterprise-grade email and collaboration system. Zimbra joins new web 2.0 companies like Writely, JotSpot, and Bloglines as well as established players such as Yahoo!, Google, Skype and Microsoft in being honored by Business 2.0.

Business 2.0, a premier publication which explores the new ways smart companies -- and the people who lead them -- are using strategy, technology, and innovation to succeed, wrote in its March 2006 issue, "The Next Net 25 identifies companies whose approaches help illuminate where the Web is headed and where the opportunities lie. The Next Net creates endless possibilities for entrepreneurs and established players alike to take advantage of the Web's new power." The complete article and listing can be found at www.business2.com.

"We believe the Zimbra Collaboration Suite is the next generation enterprise solution, and we are pleased that a visionary publication like Business 2.0 recognizes the contribution we are making to the future of Web-based business applications. By leveraging the open source community, the Zimbra Collaboration Suite has brought the long-stagnant e-mail market back to life, by delivering an effective e-mail server, a collaborative calendar system and an innovative AJAX-based user interface." Said Dharmaraj, co-founder and CEO of Zimbra. "We are honored to be recognized by Business 2.0 and hope to continue to revolutionize business collaboration."

Zimbra, launched in fall 2005, has already garnered many accolades within the technology industry. The Zimbra Collaboration Suite is a finalist SIIA's 2006 Codie Awards for Best Communication or Collaboration Solution and Best Open Source Solution, Zimbra was selected as both the 2005 Innovation award and 2005 Audience Choice winner, at the Under the Radar Conference, and Zimbra was also one of ten companies chosen to present at Software 2006 Software Showcase.

About Zimbra

Zimbra's mission is to dramatically improve the messaging and collaboration experience for both administrators and users. Zimbra's goal is to achieve 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 provides rich, secure, anytime access for anyone within the enterprise. More information and software downloads are available at www.zimbra.com.