Yup, checked both of those, thanks.
Further testing on my part suggests that the problem only occurs under Mac OS X 10.5.7. When I tried under 10.5.6, things were fine. Also, the problem only happens with meetings created on a CalDAV (Zimbra) calendar, not with ones created on a local calendar. So that pretty much rules out my Address Book setting.
I've also found that on some machines, initial notifications (invitations) are (sometimes?) sent. But updates, e.g. if the meeting is moved, are not sent.
Whenever a notification/update fails to be sent, a message like the following appears in the Mac console
Quote:
6/11/09 9:48:38 PM iCal[2053]
[CalDAVScheduleEventQueueableOperation performHeaderComplete] etag conflict for BED21E7A-3927-4FF4-AA31-4C675E44467F (client etag="2500-2497"; server etag=(null)). skip schedule operation
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I found these two items in bugzilla, not sure if they're related somehow to my problem:
Bug 30786 - CalDAV GET requests return no ETag (marked FIXED)
Bug 31168 - No calendar-query REPORT support on CalDAV schedule-inbox and schedule-outbox (still open)
EDIT: I doubt it's relevant, but the account is in a domain within Zimbra, with a virtual host. Server name is zimbra.mprinc.com; domain is mprinc.com with virtual host zimbra.mprinc.com. The only thing that's "off" about the config, to my knowledge, is that I haven't yet set zimbra.mprinc.com as the mx for mprinc.com.