To upgrade your Zimbra Network Editor OR Open Source Edition server: Download the Zimbra installation file to your server For Zimbra Network Edition, http://www.zimbra.com/downloads/ne-downloads.html For Zimbra Open Source, http://www.zimbra.com/downloads/os-downloads.html Unpack the tarball, tar -xzvf Change to the new Zimbra directory Run the installation program, ./install.sh Follow the prompts