I have read a lot of issues on here with syncing and Outlook - I think I have tried most if not all suggestions to resolve the following issue.
I have a small business of 6 - 8 machines using ZCO. I am running zimbra 5.0.11_GA_2695 network edition together with the equivalent outlook connector. Operating system is RHEL 5.2.
Users seem to access shared calendars and sync fine for about 2 weeks, but syncing of emails and calendar appointments seems to stop at some point. The end user only becomes aware of the issue after they shutdown their computer of an evening and when they come into work the next day and open outlook, all of their missing mail comes flooding in. This also results in double-ups for calendar bookings because the appointment they make doesn't seem to get to the server (I assume).
If a send/receive is manually initiated in Outlook, it completes successfully, however the mail still does not appear in the user's inbox. The only way to get the mail delivered to the users outlook client is to shutdown the machine and restart. If I login to the web client, I can see all of the email in the user's inbox, so the mail is being received at the server level.
This only happens to a few of the users at any one time. Sometimes it is one user, on other occasions its another user.
I have tried rebuilding the outlook profile and zdb's etc but this doesnt seem to work long term.
One consistent error (or maybe not an error) I have seen in the logs on the client is attached in a screenshot. Is this the cause of the problem?
My users are coming up to the first renewal of their zimbra licence and I am not sure how to convince them to pay if I cant fix this problem permanently (or at least for the medium term).
Only thing I havent done is replaced the network switch that all of these users connect to as I thought that maybe there were a few dodgy ports on it that were interfering with syncing (their other network apps continue functioning so I doubt this is the problem but I am out of ideas) - is it worth trying this anyway?
What do I need to do/provide to get to the bottom of this?