Outlook 2003 dropping IMAP connection after 5.0 GA upgrade
I'm having an issue ever since upgrading our ZCS 4.5.9 server (on Mac OS X Server 10.4.10) to the 5.0 GA release. It seems that Outlook 2003 clients (accessing via IMAP, previously working flawlessly) are having their IMAP connections dropped prematurely by the Zimbra server whenever viewing messages with attachments over about 3MB. However, this does not seem to affect Thunderbird or Apple Mail clients.
When attempting to view these messages, the Outlook client nearly immediately displays a message saying that the item could not be viewed because the server has dropped the connection. "This may be cause by the connection having been left idle for too long," or something to that effect. The server appears to be running flawlessly otherwise...