My Outlook 2010 gives "target principal name is incorrect" when attempting to connect to POP3 SSL. The standard answer to this problem is that there is a mismatch between the URL Outlook is using to connect to the email server, and the Common Name in the certificate that the server returns to identify itself.
But, in my case, Outlook's Incoming mail server=C.pop3.aa.net.uk and the certificate the server returns has Subject=CN=*.aa.net.uk, so what gives?
Could it be that Outlook certificate verification cannot process *s properly?
(I found on the net two other alleged explanations for this error: (a) that Outlook 2007 does not look at the Subject but rather the first entry only in Subject Alternative Name - I tried changing Incoming Server to that but it didn't fix it. (b) That if you have more than one account configured in Outlook they must all be configured the same way - I have three accounts and tried making them all the same but that simply caused three of these errors rather than one (if I answer NO to "do you want to continue...").)