Question : the certificate is invalid for exchange server usage

I am trying to issue a smtp, iis and pop certificate from my ad certificate services.

Answer : the certificate is invalid for exchange server usage

You really should be using a commercial certificate rather than a self signed certificate for anything public facing. Self Signed certificates of any description are useless unless you have control over 100% of all clients, which you will not with SMTP and OWA traffic.

A suitable certificate is $60/year from GoDaddy. http://CertificatesForExchange.com/

Simon.
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