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Configuring Certificate Authoritiy server on 2008 for Exchange 2020

I have configured exchange 2010 Enterprise on 2008r2 enterprise.I was able to purchase a certificate from go-daddy and installed it. This solved the certificate errors when connecting using the public url from outside https://mail.publicdomain-name.com  . But since our internal domain name is owned by someone else, I was not able to by a certificate authority. Unfortunately our internal domain name .com ( i wish it was .local) .
I was told the only way to solve this is configure certificate authority locally on our network. Besides the exchange server, we have another domain controller running 2008r2 enterprise .
On which of the two servers should I install the certificate authority  and more over how wold i configure an create certificates.
I hope i can get rid of the certificate errors from internal Outlook users.  
 
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endital1097
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you could use an internal CA
you could assign an additional ip address to the server
then for the default web site add an additional binding for 443 on the new IP and apply the internal CA cert to the new binding
this makes your deployment more complex and more difficult to troubleshoot future issues
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Thank you all,