To connect to a Microsoft Exchange Server computer remotely over the Internet, a client must use the server's FQDN. This is because the server name must be in a format that can be resolved over the Internet. Instead of connecting to a server using its computer name (also called a NetBIOS name) as the client on a LAN does, you must specify a name such as server1.acme.com. If the server name is not registered in DNS, you can specify the IP address instead.
To specify the home server name