outlook cert error sbs 2010

SBS 2010 with exchange server name is x.mydomain.local
external y.mydomain.com

created wildcard cert on godaddy with *.mydomain.com which works fine.
I also created a self cert for *.mydomain.local but I have not been able to figure out how to assign both

When users at there desktop try to access email via outlook they are getting cert errors.
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HalCHubAsked:
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Gareth GudgerConnect With a Mentor Commented:
Agree with the other experts here. Looks like you need to modify internal URLs and configure split-brain DNS.

Check out this link as well. Lots of screenshots and step by step instructions.
http://supertekboy.com/2014/05/27/designing-a-simple-name-space-for-exchange-2010/
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becraigCommented:
Here is a previously answered questions that point you through what you need to do.

http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/Q_28410114.html
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Nick RhodeIT DirectorCommented:
By default with a .local domain most likely your client access server, web services, and OAB directories are the .local.  You would simply update these to the external DNS name so they match your certificate.  

  You would create an internal DNS zone that matches your external.  Then on exchange you would update those services to reflect the change.

  You can check out this little informative article that has some powershell commands to change the services and what you need to restart in IIS to get them to work with a .local domain.

Redirecting Internal Names to Registered Domain
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