Exchange 2013 Change Domain Name Questions

I currently have 1 Exchange 2013 server.  I have a total of 15 domains that I accept mail for.  The default domain was ABC.COM.

I have recently changed the default domain to XYZ.COM, but the Autodiscover DNS configurations have not been changed yet.

In addition, I have not changed the SSL certificate either.....

Here are my questions:

1.  How do I switch the SSL certificate in Exchange?  Do I need to generate a new CSR from Exchange and send to GoDaddy, or can I just rekey the existing one?
2. Once I receive the changed certificate how do I install it?

3.  Which URLs do I need to change in Exchange once I install the certificate for Internal and External Connections so the autodiscover, web access, etc works with the new domain name and cert.?

*** Also, any other things I am missing??
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Miguel Angel Perez MuñozCommented:
1- Depends of your provider. In fact changing names requires new certificate, some will get new certificate with names you want to change, some others will require you paid for new certificate. The way to go, can be using CSR or gives your requirements to Godaddy to create your certificate. Then, import on Exchange.

2- From ECP, import and assing to WWW:

3- This must me rethink before ask for a new certificate. Usually: autodiscover, webmail (or whatever you are using to using webmail) and mail (if you are using other name different to publish smtp server rather than webmail).

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Jason CrawfordTransport NinjaCommented:
If your only concern is Autodiscover just use SRV records.  Login to the DNS host for and configure this:

Type: SRV
Domain: @
Protocol: TCP
Service: autodiscover
Weight: 10
Port: 443
TTL: 1 hour

This assumes the URL for the old domain...substitute for whatever is actually used if necessary.  I've setup multi-tenant Exchange many times, and this method prevents you from having to include each tenant domain in your UCC cert.
Kash2nd Line EngineerCommented:
or have a cname record for to point to
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Jason CrawfordTransport NinjaCommented:
That will cause Outlook to pop up a cert warning for a name mismatch.  The only way to bypass this without adding domains to the UCC cert is to either A) use an SRV record or B) create another vDir in IIS.  Option A is by far the easier of the two.
Kash2nd Line EngineerCommented:
shit, totally forgot about that. you are right :)
Jason CrawfordTransport NinjaCommented:
Eh it happens.  I just happened to be working on a multi-tenant Exchange migration so it's fresh in  my head :)
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