We're trying to test Zimbra for our organization (the Network Edition) and one of the claimed features is a sync with iCal. However, I can't find any instructions for how to do this in the documentation. A search of the web yields only some references to a "Zimbra iSync" program, but a post in the installation forum and an email to support have yielded no responses.

Does anybody know how to do 2-way sync with Mac's iCal?