OK, maybe I'm nitpicking here, but I just did an upgrade from FOSS version 5.0.2 to 5.0.4 and found that I had to add an undocumented "platform-override" switch to the install script because I'm running CentOS instead of the "official" RHEL. I just don't understand the need to have this switch. There is and always was a spot in the install where it informed you that you were trying to install a version of the software that did not match the OS you were running; and it makes you acknowledge this before continuing. I don't think we need to start up the whole RHEL vs. CentOS compatibility, etc., etc., but surely the Zimbra folks realize that many users do use CentOS, and will continue to do so. At the very least this change should have been documented in the Release Notes. Also, the point where the install stops you and tells you that you need to add this switch is several steps in. If the install can detect that I'm not running the "correct" OS for the version I am trying to install, do it right up front so I don't have to waste time.