We discovered that Exchange 2007 has five specific steps that
have to occur in a particular order for CFPOP to resume working
properly. We did this (despite several security issues) because
this function is strictly internal. Not recommended for an
application available to the general public.
Steps for making Exchange 2007 work for CFPOP:
1) Start the POP service on the Exchange 2007 server.
2) Allow the necessary email accounts to use POP3.
3) Lower the security requirements on those accounts to allow
CF to send clear text instead of encrypted (SSL) requests to POP3.
4) Set the Exchange server to allow relay.
5) Lower the security requirements for relay.
I hope I explained this correctly. This is how my network
supervisor explained it to me.