WHAT IS ZIMBRA UNIVERSAL UI
Zimbra universal UI is a theme by Zimbra, that is much more modern, professional looking theme, looks much near to Outlook theme. According to Zimbra, this is still in Beta since 2017, and not available anywhere unfortunately to install/download it from Zimbra until you are using one of the Zimbra Cloud by Zimbra Inc.
HOW DID WE MANAGE TO GET ZIMBRA UNIVERSAL UI?
Zeta Alliance had released an unofficial Zimbra 8.8.5 with the Zimbra Universal UI theme in it, that is downloadable here:
zcs-8.8.5_GA_2000.RHEL7_64.20171222124635.tgz
We installed it and tweaked the ZUU theme to be able to use in any Zimbra 8.8.* version available.
HOW TO INSTALL ZIMBRA UNIVERSAL UI
First keep a copy of zimbra folder:
rsync -vrplogDtH /opt/zimbra/jetty/webapps/zimbra /root/zimbra_backup
Then, download a copy of the zimbra UI from here:
wget https://mellowhost.com/downloads/zimbra-ui.tgz
Untar and migrate to zimbra folder:
tar -xvzf zimbra-ui.tgz rsync -vrplogDtH zimbra/ /opt/zimbra/jetty/webapps/zimbra/
(Optional) This will install a new theme called ‘clarity’ which is our Zimbra Universal UI theme. You may either use this, and advise your users to choose this as a theme, or replace the default Harmony with this one. To do this, you may do the following:
cd /opt/zimbra/jetty/webapps/zimbra/skins mv harmony harmony_old ln -sf clarity harmony
This is done only by creating a softlink for old harmony to clarity theme
Now fix the permissions and restart zimbra to make everything work:
# Fix permission /opt/zimbra/libexec/zmfixperms -v service zimbra restart
You may now access Zimbra from your browser to see the new theme loading. If you are having trouble with the http access for your webmail, you may use the following to redirect your http webmail to https webmails