In the latest release of Lightning (0.9), Free/Busy does work with Zimbra. Create new calendar in Lightning, choose CalDAV as type, and for location enter http://<username>@<server>/dav/<username>/Calendar
Yes, you enter the same username twice.
(The only real issue I've found with Lightning is that you can't modify your calendar when working offline.)
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Elliot Wilen
Berkeley, CA
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