Match local server name to certificate name in Exchange 2013

Hi I have a secure certificate for exchange.mydomain.com from GoDaddy for my Exchange 2013 server.  It's installed and  works fine for OWA and other Outlook connections, but when internal Outlook clients connect they get a certificate challenge saying that the server name does not match.  When they connect, the server name is resolved by Outlook to server.localdomain.local.  There is a record on the local DNS server resolving exchange.mydomain.com to the local IP of the Exchange server.
How can I make the internal Outlook clients resolve to exchange.mydomain.com so the certificate works for internal clients?
Thanks
PlexioUKAsked:
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PlexioUKAuthor Commented:
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Jason CrawfordTransport NinjaCommented:
Follow this guide to set the internal URL of all vDirs and set the autodiscover internal URI for your CAS servers:

http://www.mustbegeek.com/configure-external-and-internal-url-in-exchange-2013/
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PlexioUKAuthor Commented:
Thanks Jason

I looked at this article earlier - specifically which part of the process alters the name the internal Outlook clients resolve to?
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Pune TechCommented:
You need to check autodiscover part , only autodiscover internal Uri.
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Jason CrawfordTransport NinjaCommented:
Just run this:

Get-ClientAccessServer | Set-ClientAccessServer -AutoDiscoverServiceInternalUri mail.domain.com

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Because .local SSL support was deprecated a few years back, you will also want to set the internal URL for all vDirs.
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PlexioUKAuthor Commented:
This was the only article that solved the problem in it's entirety
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