Is CentOS actually supported now. I thought it was one of the OS's that had Non-Official support. RHEL 4/5, SLES 10, Mac OSX, and Ubuntu 6.06 LTS are still the only one's listsed in the docs. At least that is what is listed for the supported Network Edition and what I gather he wants from "Complete version".
If you want the Free Open Source, there is a community build that gets updated frequently for 8.04 that dijichi2 normally assembles.
Mail | Dell 2950III | 2x Quad Core 5420 | 8gb RAM | 6x 146gb SAS RAID 0+1 | Red Hat 5.3 | Zimbra 6.0.10 Network Edition
Test | VMware ESXi Whitebox | Phenom II Black 3.2ghz | 12gb RAM | 6x 1tb SATA RAID 0+1 | CentOS 5.4 | FOSS, Not in use now