I have an SBS 2008 server contososerver.contosodomain.local which is externally accessible with the domain remote.contoso.com and an SSL certificate for the external domain which we installed using the SBS 2008 wizard. This works great for OWA because IIS serves the remote.contoso.com certificate. I also want to turn on external POP3/IMAP4/SMTP however when I try, I get served the internal certificate that SBS generated automatically (using its internal CA) which has the alternate names remote.contoso.com, contososerver.contosodomain.local and contososerver. I tried removing this certificate from Exchange but it won't let me because it needs it for its internal receive connector. So how do I tell Exchange 2007 to use the real certificate for external POP3/IMAP4/SMTP?
The procedure seems to be easier in SBS 2010 because Exchange 2010 has certificate management in its GUI. The steps are as follows: