how can I update an exchange 2013 certificate

I have a certificate on our  exchange 2013 server and we need to add another subject alternate name to it. So I added the new name to the cert via godaddy and now got the new cert from them. How can I add this to the 2013 server since the cert is already there but needs this other cert with the 1 added subject name?
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Simon Butler (Sembee)ConsultantCommented:
Unfortunately you cannot use the file you got from GoDaddy, as you don't have a matching request on the server. Generate a new CSR on the server, then do a rekey within the GoDaddy system. You will then get a new response which you can install on to the server and then remove the original.


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vmichAuthor Commented:
rekey cert
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