Zimbra Desktop is very reliable free desktop e-mail client for windows,mac and unix systems that gains popularity as you read this post.
Visit Zimbra homepage and download the Linux client.
Unpack in the default directory.
Step 1. Locate the installation script and execute it.
Follow the instruction given by install.pl script. Paths can be retyped as default.
(Remember not to install the profile for root)
Navigate to /opt/zimbra/zdesktop/linux to install the profile for the current user.
In case you can’t run the client you may want to chmod zdesktop to 770.