Spent three hours wrestling with ZCS 8.0 (latest version) on the following OSes:

Centos 6.3 6.2
Ununtu 12.04

The installation completed but could not start Zimbra and the general issue with all of them:

/etc/init.d/zimbra start
Host localhost
Unable to determine enabled services from ldap.
Unable to determine enabled services. Cache is out of date or doesn't exist.