Exchange 2007->2013 cert question

I'm about to renew my cert for exchange and after that, I will migrate to 2013.

Here is what I have now:

- my external domain: domain.com
- my internal domain: local.domain.com

My cert is for:

mail.domain.com
autodiscover.domain.com

Because my internal and external domain is different, I'm using the DNS zone trick so my email server is accessible using the same name internally and externally.

- - - - - - - - - - -

My current setup is only one server but my 2013 setup will incorporate 2 servers: I will be using DAG for database availability and DNS round robin for CAS.

MY QUESTION IS:

what do I need on my new certificate ?

First of all, I know it will be 'legacy' name for 2007 server but should it be legacy.local.domain.com or legacy.domain.com ?

Also, since I will have 2 new servers using DNS round robin, they will be both using mail.domain.com name in CERT, am I right ?

Thanks
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tp-it-teamAsked:
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Jason CrawfordTransport NinjaCommented:
As long as you are configuring the internal URL for all virtual directories to match the external URL you don't need to worry about covering your internal domain in your cert.

I recently deployed Round Robin for 2013 CAS redundancy between two data centers and it works flawlessly so I think you'll be pleased with the results.  All you have to do is add the WAN IP assigned to each server to the public A record for mail.domain.com and you're done.  You can test by opening Outlook and running netstat -ano | findstr "Insert Outlook process ID".  Take note of the WAN IP and diable the NIC on the server the IP is NAT'd to.  Sit back and watch Outlook reconnect to the next IP in the A record within 5 minutes completely free of charge.  It's a beautiful thing.

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Iradat SiddiquiCommented:
Please use the SAN (Subject Alternate Name) certificate for exchange , with all the required dns names (internal/external).
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