Hi, recently installed the open source version of Zimbra on CentOS and like the interface. Performance hasn't been a problem, but we haven't done perf testing as of yet to see where it strains.
On another note, I noticed a couple of things that seem odd.
-Postfix is configured to give out it's default smtp banner.
-Any mistyping in the url will show you an error page that tells you Apache Tomcat/5.5.15 is running instead of a page-not-found or page missing message.
-A head request on the url tells you that Apache-Coyote/1.1 is running.
-Requests to pop3/110 let's us know that the Zimbra POP3 server is ready.
Will be doing some digging to evaluate the security of the application/s before we decide to purchase. Just curious what measures have been taken to secure the install?