Installing Certificate on Exchange 2013 DAG

[danalex]

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Hey,

I have got a exchange 2013 DAG. 2 CAS server with 2 MBX server. I have inherited the setup from another admin.

I need to renew the certificate on those exchange server. We got our own Windows CA on premise and i see that the old admin use 4 different certificates for all the exchange server cause i see they have different thumbprint.

Questions:

logically all the CAS should have the same certificate, right?
Should MBX server should have different certificate than the CAS or the same?
By renewing the certificate do i need to change IIS now if the old certificate as not expire yet
I am use on dealing with one exchange server not 4 in a DAG environment

thanks for your help in advance

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