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Zimbra Collaboration Suite (ZCS) is a groupware product developed by Zimbra Inc. The company was acquired by Yahoo! in September 2007.

Zimbra consists of both client and server components. Zimbra is available in three releases: an Open Source edition, Network Standard edition, and Network Professional edition. The free version is missing several features including Outlook synchronization, mobile synchronization, backup features, clustering features, and more.

The ZCS Web Client is a full-featured collaboration suite that supports email and group calendars using an Ajax web interface that enables tool tips, draggable items, and right-click menus in the User Interface.

ZCS is compatible with proprietary clients such as Microsoft Outlook and Apple Mail as well as the open-source Novell Evolution, so that mail, contacts, and calendar items can be synchronised from these to the ZCS server.

 ZCS 8

Free to download; for commercial version licenses are sold in blocks of 25 and priced on a sliding scale. For example, 75 Professional Edition mailboxes for a business are priced at /user/year


ZCS Server - Mozilla Public License
ZCS Web Client - Zimbra Public License

Zimbra Inc.


System Requirements
Evaluation and Testing
Intel/AMD 32-bit or 64-bit CPU 1.5 GHz
5 GB free disk space for software and logs
Temp file space for installs and upgrades*
Additional disk space for mail storage
Production environments
Intel/AMD CPU 32-bit 2.0 GHZ+.
For large deployments (more than 2000
users), 64-bit OS is recommended.
Minimum - 2 GB RAM
Recommend - 4 GB
Temp file space for installs and upgrades*
10 GB free disk space for software and
logs (SATA or SCSI for performance, and
RAID/Mirroring for redundancy)
Additional disk space for mail storage

For Red Hat Enterprise, Fedora Core and
SuSE operating systems, the server must also
have the following installed:
NPTL. Native POSIX Thread Library
Sudo. Superuser, required to delegate admins.
libidn. For internationalizing domain names in applications (IDNA)
cURL. A command line tool for transferring files with URL syntax
fetchmail. A remote-mail retrieval and forwarding utility used for on-demand TCIP/IP links.
GMP. GNU Multiple-Precision Library.
compat-libstdc ++-33. Compatibility Standard C++ libraries.
NOTE: The 32-bit version of the compatlibstdc rpm package is required for both 32-bit or 64-bit servers.
For Red Hat Enterprise only: compatlibstdc++-296

Zimbra Wiki

Selected Reviews:, LinuxPlanet, blogspot,

Features include:

  • This PDF describes the different features of the three different editions

Return to Groupware Home Page | Return to Email Home Page

Zimbra also features in our 'Linux Equivalents to Windows Software' section. The category selector below allows you to filter the different types of software included in that separate article.


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Last Updated Sunday, April 26 2015 @ 05:34 AM EDT

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