First of all, if the *right* certificate has already installed on Exchange, you don't have to generate one. You just need to install the CA cert on CUPS.
"Right" means the cert was issued by a CA (Certificate Authority).
So the simple question would be "where did you get that Exchange certificate from"? Was it from Verisign, GoDaddy, or a local CA server? If the answer is "I don't know" or "it's already there after I installed Exchange", it's probably not a "right" certificate.
If it's not a "right" certificate, then you have couple options:
1. Buy a certificate from Verisign, GeoTrust, GoDaddy or any well-know CA.
2. Install your own CA server
3. Use makecert.exe to create a cert
=== until to this point, we are still talking about "get the right certificate installed on Exchange" ====
Once you got the right certificate installed on the Exchange, the next step is to get the CA cert intalled on CUPS.
CA cert means the certificates with the name of CA (instead of the one with the name of Exchange).
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