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First of all I'd suggest you update to the most recent CentOS 5.3 before installing Zimbra, which version of Zimbra did you download (what is the filename)? There should be no problem installing Zimbra on CentOS.
It looks like you are using the Fedora 11 Zimbra installer. I would recommend using the Red Hat Enterprise Linux 5 Zimbra installer since CentOS 5 is just recompiled RHEL 5.