ref : http://goo.gl/9Mpv2 1. Download Zimbra Collaboration Suite 8.0.1 from zimbra official website :[root@host1 ~]# wget files2.zimbra.com/downloads/8.0.1_GA/zcs-8.0.1_GA_5438.RHEL6_64.20121105164412.tgz2. Extract Zimbra Collaboration Suite 8.0.1 :[root@host1 ~]# tar xzvf zcs-8.0.1_GA_5438.RHEL6_64.20121105164412.tgz3. Start the Zimbra Collaboration Suite 8.0.1 installation :[root@host1 ~]# cd ..