We have recently renewed our SSL for our Exchange 2010 Server, which is working fine.
However, I want to install the SSL certificate on the backup CAS server, but when I do an EXPORT (from the live server) and try to IMPORT to the backup server, I get the error:
"Cannot import certificate. A certificate with the thumbprint .................... already exists"
I thought this was the method (export-import) I used last time, but can't recall how to solve this error.