5.0.3+ update ate the messages line in my syslog.conf. I guess the update script doesn't like the fact that I'd noticed and patched the duplicate-syslogging bug on my own? I had added local0.none;auth.none so as to put that stuff in /var/log/zimbra.log exclusively a few days ago.
To be clear, the reason this is a problem is that now daemon.info and friends goes nowhere.
--- /etc/syslog.conf.bak 2008-03-23 20:41:05.000000000 -0500
+++ /etc/syslog.conf 2008-03-23 20:41:05.000000000 -0500
@@ -4,7 +4,6 @@
# Log anything (except mail) of level info or higher.
# Don't log private authentication messages!
# The authpriv file has restricted access.