[dJeyL]

There's nothing wrong in your setup, I've experienced the very same problem with 5.0.16 (OSS), but got the same configuration working with 5.0.15 (NE).

When it fails, my iPhone's log shows several warnings, among which I think this one should be investigated:

CalDAV PROPFIND response parse error at line 13 column 32

I've sniffed the communication between my iPhone and Zimbra, and it looks (smells...) like the second PROPFIND on the shared calendar fails (I think the parsing error happens at that moment). Normal calendars don't make the iPhone issue two PROPFIND commands, only one.

I know basically nothing about CalDAV, but it seems that for a shared calendar, the first PROPFIND response says "it's not a local one"; the following line doesn't appear for a regular calendar:

<Y:mountpoint xmlns:Y="http://yahoo.com/ns/"/>

But then a second PROPFIND is sent, and its reply is unparsable.

So what's on line 13?

<Y:mountpoint xmlns:Y="http://yahoo.com/ns/"/>

I guess I should file a bug, but I'm afraid I'd be totally unable to explain it properly (see above!).


EDIT: Oh, and BTW, everything worked like a charm in Sunbird with the same setup. Could be an iPhone issue, then, but why does it work with 5.0.15 (NE)?!