I have an Exchange 5.5 server running service pack 4. NAV for Exchange was installed and after reboot it did not allow clients to connect through POP3. The first time this happened I removed NAV and reran the NT Service Pack 6a which cleared the problem. This time when it happened POP3 will not initialize and creates an event log. Micorsoft site says it is something holding the port. I run netstat -an and I see the loopback address listening on 110. Symantec has not been much help. Has anyone had a similar problem and how can be sure it is NAV for Exchange that is actually the program listening on port 110 on the loopback address.
