https://www.zimbra.com/downloads/zimbra-collaboration-open-source/
Zimbra Collaboration – Open Source Edition
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LATEST GA RELEASES stable
8.8.9 GA Release
Release Notes | 3rd Party Open Source Licenses | Windows Open Source Licenses
Zimbra Collaboration 8.8.9 Patch-1 has been issued on 19 July 2018.
With 8.8.9 Patches, customers do not need to download any Zimbra Collaboration Patch builds. Patch packages can be installed by using Linux package management commands. Please refer to the release notes for Zimbra 8.8.9 Patch-1 installation on Redhat and Ubuntu platforms. Release Notes
| Platform | Download 64-bit |
|---|---|
 Red Hat Enterprise Linux 6 |
64bit x86 (MD5) (SHA 256) |
 CentOS 6 |
64bit x86 (MD5) (SHA 256) |
 Oracle Linux 6 |
64bit x86 (MD5) (SHA 256) |
| Red Hat Enterprise Linux 7 |
64bit x86 (MD5) (SHA 256) |
| CentOS 7 |
64bit x86 (MD5) (SHA 256) |
| Oracle Linux 7 |
64bit x86 (MD5) (SHA 256) |
 Ubuntu 14.04 LTS |
64bit x86 (MD5) (SHA 256) |
| Ubuntu 16.04 LTS |
64bit x86 (MD5) (SHA 256) |