I don't see how this answers my question. I am looking for a hosted calendar server that supports CalDAV in the way the new Leopard iCal is meant to work (group scheduling, free/busy, etc.) Seems like there is nothing out there.
If you find and answer, please post. We stupidly upgraded our office to Leopard for the CalDAV functionality. Now we see that it's not supported and we're dealing with all the Leopard problems without the iCal "fix" we needed.