How to Install Zextras Theme for Zimbra | Zimbra

Alert! This article is written for Zimbra OSE users. As of December 2023, Synacor will no longer be providing support for Zimbra OSE. You might want to consider trying out Carbonio Community Edition – Zextras’s free and open-source email and collaboration platform.

For additional guidance, check out our community articles detailing the process of migrating from your current platform to Carbonio CE.

Zextras theme is a modern-looking theme for Zimbra compatible with Zimbra 8.6 and above including Zimbra 9. It does not change any classic UI element or functionality, so you don’t need to spend any time getting accustomed to it. When it comes to visually more pleasant themes, the Zextras theme is truly unique that no other available themes get even close to it. It doesn’t simply provide you with a graphically better-looking workplace, it also constructs a more enjoyable and easier work experience by offering more proportional buttons, better visibility, and readability for your users.



How to install Zextras theme on your Zimbra

If you are a Zextras Suite user you will automatically get this theme from Zextras Suite 3.1.5 and above, otherwise the system administrator should install it manually on the Zimbra server as follows.

Note: Zextras Theme can not be installed individually by the users, it should always be installed by the system administrators on the Zimbra server in order to make it available to the users.

If you are a system administrator who wants to install the Zextras theme manually on your Zimbra server so that the users will be able to use the theme, you need to download the package, install it on your server then restart the Zimbra Web Application. Here is how you do it in detail

1. On your Zimbra server download the package by:

on Ubuntu


on CentOS


2. Extract the downloaded package by

on Ubuntu

tar xvf zextras-theme-ubuntu.tgz

on CentOS

tar xvf zextras-theme-centos.tgz

3. Go to the extracted directory

cd zextras-theme-installer

4. Execute the installation script

sudo ./

5. Apply the new theme with zmskindeploy to be sure

su - zimbra -c 'zmskindeploy /opt/zimbra/jetty/webapps/zimbra/skins/zextras/'

6. Restart the Zimbra Web Application (mailboxd) by

su - zimbra -c 'zmmailboxdctl restart'

Now your users will find the Zextras theme in the Preferences, under Appearance to select and save.

Zextras Theme New Versions

Zextras theme will be updated regularly in the future. If you are a system administrator who has already installed the Zextras theme separately but wants only to upgrade, you can learn how to upgrade to the new version in the following post on our community blog:

Download Zextras Suite for Zimbra OSE



Hi Arman, I am using your theme. I like it. It would be preferable to have a mobile theme also. On my Samsung Android 10 I see this as a problem. I am a private user for Zimbra Foss9 and Zextras. Zimbra v8.8 has a mobile client (free) Can you indicate on this feature request?

Arman Khosravi

Hi dear Martin,

I agree with you about the mobile theme but unfortunately, it can't be done since the Zimbra Touch Client, Zimbra Mobile Client, and Zimbra HTML (Standard) Client are no longer a part of Zimbra open source starting from version 9.0.0. as can be seen in Zimbra Releases/9.0.0 - Zimbra :: Tech Center.

Thank you very much for your feedback.

We'll be available for further questions,



Thanks! I understand/agree.


I also encountered a problem. After modifying the default login theme, the login input window is too long. sed -i 's/harmony/zextras/g' /opt/zimbra/jetty/etc/ zimbra.web.xml .in The UI is very ugly How to solve it? THANKS

Arman Khosravi

Posted by: @tinging

I also encountered a problem. After modifying the default login theme, the login input window is too long.

sed -i 's/harmony/zextras/g' /opt/zimbra/jetty/etc/ zimbra.web.xml .in

The UI is very ugly

How to solve it?

Hi @tinging,

Probably the Zextras Theme installation procedure was not correct. I suggest following the official documentation at and, if the issue persists, opening a ticket.


The interface is like this:


works on centos 8?

Hi Kirill,
Yes, it does support CentOS 8 and will continue to work on future updates as well.


Would be good to have a setting for colour picking the theme, I suspect it is possible to have a prod in the CSS for settings but something that gave you a core colour pick and generated the accents for you would be good. Would avoid having lots of colour themes hacked about! If not then a range of basic red/blue/green/grey/yellow/orange etc would also help.

Arman Khosravi

@donty Hi,

It seems a good idea.

Thanks, I will try to pass it on.


HI, i installed the theme but i saw that during the loading screen the word "undefined" is written on the footer in the middle. what can it be? Thank you

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