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Zimbra Collaboration
Developer(s) Zimbra, Inc.
Initial release July 26, 2005; 11 years ago (2005-07-26)
Stable release
8.7.0[1] / July 13, 2016; 3 months ago (2016-07-13)
Repository git.zimbra.com/repos/zimbra-foss/.git
Development status Active
Type Collaborative software
License Zimbra licensing
Website www.zimbra.com

Zimbra Collaboration Suite (ZCS) is a collaborative software suite, that includes an email server and web client.

Zimbra was initially developed by LiquidSys, which changed their name to Zimbra, Inc. on 26 July 2005.[2] The Zimbra Collaboration Suite was first released in 2005. The company was subsequently purchased by Yahoo on September 17, 2007,[3] and later sold to VMware on January 12, 2010.[4] In July 2013, it was sold by VMware to Telligent Systems[5] which changed its name to Zimbra, Inc. in September 2013.[6] It was then acquired by Synacor Inc on 18 August 2015.[7]

According to former Zimbra President and CTO Scott Dietzen, the name for Zimbra is derived from the song "I Zimbra" by Talking Heads.[8]


The software consists of both client and server components, and a desktop client. Two versions of Zimbra are available: an open-source version, and a commercially supported version ("Network Edition") with closed-source components such as a proprietary Messaging Application Programming Interface connector to Outlook for calendar and contact synchronisation.[9]

Zimbra Desktop is a full-featured free desktop email client.[10] Development was discontinued under VMware's stewardship in 2013 but was restarted in February 2014. In addition, the webclient features an HTML5 offline mode starting with version 8.5.[11]

The ZCS Web Client is a full-featured collaboration suite that supports email, group calendars, and document sharing using an Ajax web interface that enables tool tips, drag-and-drop items, and right-click menus in the UI. Also included are advanced searching capabilities and date relations, online document authoring, "Zimlet" mashups, and a full administration UI. It is written using the Zimbra Ajax Toolkit.[12]

The ZCS Server uses several open source projects (see the section, Included open source projects). It exposes a SOAP application programming interface to all its functionality and is also an IMAP and POP3 server. The server runs on many Linux distributions.[13] OS X Server support was dropped with version ZCS 7.0.

ZCS can synchronize mail, contacts, and calendar items with open-source mail clients such as Evolution and also with proprietary clients such as Microsoft Outlook and Apple Mail, either through proprietary connectors or using the ActiveSync protocol,[14] both available exclusively in the commercially supported version. Zimbra also provides native two-way sync to many mobile devices (Nokia Eseries, BlackBerry, Windows Mobile, iPhone, Android).[9]

Software license[edit]

Starting with version 8.5 the Zimbra Collaboration Suite (ZCS) source code is available under the terms of the GNU General Public License version 2 (backend) and the Common Public Attribution License version 1 (frontend).[15]

Previous versions were released under the Zimbra Public License (ZPL). The Free Software Foundation accepts the license as being a free software license and refers to it as being identical to the Yahoo! Public License with the exception that Zimbra, Inc. provides the license, rather than Yahoo!.[16]

Included open source projects[edit]

The ZCS Server uses open source projects such as:[17]

It previously used:

  • MySQL (last used in version 8.0)
  • Apache Tomcat (last used in version 4.5)
  • Perdition mail retrieval proxy (until 4.5)

See also[edit]


  1. ^ "Zimbra Releases - Zimbra :: Tech Center". zimbra.com. Retrieved 18 August 2016. 
  2. ^ "Patent US20090100073 - System and method for enabling an external-system view of email attachments". google.je. Retrieved 22 February 2016. 
  3. ^ Zimbra.com (2007-09-17). "Yahoo! Acquires Zimbra". Zimbra.com. Retrieved 2010-05-30. 
  4. ^ Vance, Ashlee (2010-01-13). "VMware Gently Nudges Microsoft with a Zimbra". New York Times Bits Blog. Retrieved 2010-05-30. 
  5. ^ Henry, Tiffany (2013-07-15). "Telligent Acquires Zimbra from VMware". Telligent. Retrieved 2013-07-15. 
  6. ^ Henry, Tiffany (2013-09-25). "Zimbra Unveils Integrated Team, Culture and Vision for People-Centered Collaboration at User Group Conference". Telligent. Retrieved 2013-12-15. 
  7. ^ "Synacor Agrees to Acquire Zimbra, a Leading Provider of Open Source Based Email and Messaging Software". Global News Wire. Retrieved 18 August 2015. 
  8. ^ Dietzen, Scott (2005-09-12). "So what's a Zimbra?". Zimbra Blog. Retrieved 2013-01-17. 
  9. ^ a b "Zimbra Compatibility with Other Desktop Clients". VMware Zimbra Official Web Site. VMware Zimbra. Retrieved 8 January 2013. 
  10. ^ "Zimbra Desktop". VMware Zimbra Official Web Site. VMware Zimbra. Retrieved 8 January 2013. 
  11. ^ "Zimbra Collaboration 8.5: Anytime, Anywhere, Any Device". Zimbra Blog. Zimbra. Retrieved 5 March 2015. 
  12. ^ "Zimbra Documentation for the Zimbra Web Client". VMware Zimbra Official Web Site. VMware Zimbra. Retrieved 8 January 2013. 
  13. ^ "Zimbra Open Source". Zimbra Official Web Site. Zimbra. Retrieved 8 January 2013. 
  14. ^ "Exchange ActiveSync(EAS) Outlook 2013". Zimbra Official Wiki. Zimbra. Retrieved 5 March 2015. 
  15. ^ "OSI Licenses for Zimbra Collaboration Open Source Edition". Jon Dybik. Retrieved 2014-06-05. 
  16. ^ "Various Licenses and Comments about Them". Free Software Foundation. Retrieved 2011-07-08. 
  17. ^ "Zimbra Components". Retrieved 16 July 2014. 

External links[edit]