Question : Certificate Authority issue in Exchange 2010 POP

Hello experts,

I have many outlook 2007 clients for exchange 2010 mailboxes. They connect through POP.

When some one tries to connect from the internal network, he gets a caution message regarding the certificate, then he clicks yes, after that he receives emails.

But when trying to connect externally, he is getting an error:

"There is a problem with the proxy server's security certificate. The security certificate is not from a trusted certifiyng authority. Outlook is unable to connect to the proxy server mail.ourdomain.com (Error Code 18) "

Any help?

Answer : Certificate Authority issue in Exchange 2010 POP

There is a guide here on how to do it: http://blogs.technet.com/b/sbs/archive/2007/04/10/installing-a-self-signed-certificate-as-a-trusted-root-ca-in-windows-vista.aspx

when browsing to the OWA site you would use /owa in Exchange 2010 instead of /exchange