I like to start my old topic again:
http://www.zimbra.com/forums/zimbra-...-0-caldav.html

I've been upgrading my iPhone to 3.1 and Zimbra to 6.0 (Release 6.0.0_GA_1802.RHEL5_20090830140212 CentOS5 FOSS edition.)

This is getting from bad to worse. With the WUI and iCal on my desktop there are no problems. However, on the iPhone, my own calendar and those shared by others are empty. Before, only the shared ones by others where empty. As work around I can create a new calendar and move all items to it, but this is far from what it should be. Another work around is to use the WUI on my iPhone.

Logfiles from my iPhone are showing the same errors as before, but now for both the shared ones and my own calendar.