Please help me i have got issue "Timeout when connecting to "POP xxxxx". Please check host/port and network" when access my office email using IMAP to access the POP server

if im using outlook 2007, there is no problem. i already telnet to the pop server and there is no problem.

i also already try to using different internet connection. the problem only happen when using Zimbra Desktop, but using outlook 2007 there is no problem

Please help, i little bit frustrated using ZD, everytime i post problem there is no solution to fix the problem..

really need help