Here's a snippet from the Zimbra corp site:
"Getting Zimbra Mobile Edition
Test drive it now using our Hosted Demo where you can download the application and run it with sample data, or if you already have a Zimbra Server simply download it there and try it with your own system.
You can also get the ZCS Network Edition free trial if you do not have a Zimbra Server and want to have an extend 60 day test (the J2ME clients are included in the Admin Console)."
I tried the comparable url to the one used on the demo2 site on our server, but got a 404 on my phone. Is it available on the 5.0.2 NE server?