When configuring outllok 2007 client to use Zimbra via IMAP , error
Log onto incoming mail server (IMAP): Your server unexpectedly terminated the connection. Possible causes include server problems, network problems, or a long period of inactivity.

appears when testing incoming mail with Test account button. Outgoing mail sent OK

Zimbra version is 7.2.0_GA_2669

Outlook is configured to use port 993 with TLS encrypted connection for incoming, port 2225 with TLS encryption for outgoing. Same error appears if I use Port 9993 for incoming