The default virtual server is created with an IP address of
(All Unassigned). For instant operation, the IMAP4 server is
identified on the network with the IP address of the Exchange
computer. This allows the IMAP4 service to receive incoming
connections on TCP port 143, and a Secure
Sockets Layer (SSL) port of 993 is used. For instant
operation, you can use the default IP address, TCP port, and SSL
port, or you can assign a different IP address from any available
network card. However, if you plan to create multiple IMAP4 virtual
servers, you must create a unique combination of IP addresses, TCP
ports, and SSL ports for each server.
Even if you leave the default SSL port set to 993, to fully enable
SSL on the IMAP4 virtual server you need to request and install a certificate.