Exchange2010 and SSL

No knowledge of the PKI system and have a question hope experts will shed the light on this.
Have CAS server configured and isnatlled third party trusted SAN certificate on the CAs server because os OWA.
The OWA is ssl setting configured to ignore the client site certificate.
We have internal CA is running and issuing users certificate to all AD users via auto enrollment policy. The internal CA has its self signed certificate so it is issuing the certificate as the root CA for the org.
Will the users able to connect OWA  if i enabled the OWA setting to client certificate to require?
or Do the users require certificate from third party where i got it for CAS server?
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sara2000Asked:
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Simon Butler (Sembee)ConsultantCommented:
You are mixing up the certificate types.
The internal CA you are using is for authentication.
The SSL certificate on the OWA virtual directory is for the connection.

If you choose to require client certificates then you will cause OWA to almost certainly stop working correctly, particularly for users connection from the outside world.

Leave it as it is, with the trusted SSL certificate on the web services directory and have users authenticate with a username and password.

Simon
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Will SzymkowskiSenior Solution ArchitectCommented:
For Simplicity I would recommend keeping your internal and external URL for Exchange the same. This way you only need to worry about one fqdn and no longer need to remember server names for internal URL's etc.

You will need to setup a split-brain DNS creating a internal zone for your External FQDN on your DNS servers. From there you create your A records for Mail.externaldomain.com and then users internally will use the same FQDN as external.

Will.
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