Since it seems that using CalDAV to sync calendars between Zimbra and Entourage 2008 is a non-starter (due to Microsoft), has anyone examined to possibility of using the Exchange Server Impersonation features of Zimbra server to make Entourage think it's connecting to an Exchange server instead?

I'm assuming that Entourage uses ActiveSync to communicate with an Exchange server the way that Windows Mobile/IPhone devices do. If that is, in fact, the case, what would it take to get Entourage to use the same conduit? If not, has any thought been given to enhancing the Zimbra backend until such a connection is possible?