No "Local Failure Notice" messages since January, when she had a much earlier version of the connector. Sync failures are going to Inbox. (By the way, how exactly do you find them if they're not?)
I can't reproduce the problem. I changed the Message-Id and ical UID: of the original invite RFC822 sources and sent them to the problem account. They all stayed; no auto-deletes.
I've left ZCO logging enabled and will grab them if the problem recurs. It has been several days, and it hasn't happened.
I'm attempting to broaden the field by contacting others:
Code:
egrep 'ZimbraConnectorForOutlook/.*moving Appointment .* to Folder Trash ' /opt/zimbra/log/mailbox.log
I think I found someone else experiencing the problem intermittently, but haven't been able to convince them that their appointments are actually missing. Usually I have the opposite problem.