Thank for the help getting the installation done. I now have RH 5 with ZCS 5 installed on my network. I installed the desktop client on a network desktop. I have it set up to go to the ISP POP3 email we have been using and it gets/sends mail. When I try to configure it to connect to the Zimbra server I get "invoke The he host did not accept the connection within timeout of 15000 ms". I've looked in the DNS server listing and it has a lookup and reverse lookup for the mailserver. So why is the client not connecting to the server? Remember I'm a NOOB to Linux and ZCS. Thanks for reading and helping, with you're guys help I get this up and running I'm sure.