Zimbra doesn't use Exchange protocols at all for desktop clients, only ActiveSync with mobile devices that support that protocol. For more details you might try searching the forums as this topic is being raised lot these days.
In a nutshell, Apple Mail will still use IMAP to connect to Zimbra, and it works quite well that way, at least with version of Mail I have (3.6).
The reason Zimbra works with Outlook is that it uses a special connector add-on, rather than emulating MS's proprietary MAPI protocol. The Exchange protocol used by Snow Leopard (and the new version of Entourage, and the forthcoming Outlook 2010 for Mac) is (proprietary) Exchange Web Services, which basically has nothing to do with Zimbra.
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Elliot Wilen
Berkeley, CA
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