Changing The Suffix on a local/public PDC

I have a client with a Windows Small Business Server 2011 running Exchange (publicly accessible).  It was originally setup with a mydomain.local domain suffix, and has functioned properly to this day.  After getting help with installing a SSL certificate for Exchange recently, the Tech Agent (from informed us that the .local suffix "isn't allowed anymore" and that the domain name should be changed with a .com suffix.  We do own the domain name it is suggested to be changed to.  Is this a straightforward reconfiguration?  Could anyone lead me to a tech bulletin that might outline the proper steps to do this without breaking our network functionality?
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David AtkinTechnical DirectorCommented:

I'm presuming that the certificate is for Exchange and Remote Web Access.

Details for requesting and installing an SSL Certificate in SBS 2011 can be located here:

You're  Internet Address Management Wizard should have already been setup with your domain name so it should be something like: or

When requesting the new certificate this internet address is the only address you need to request.  You don't need to request a certificate for the local domain name.

Hope this make sense.
Toni UranjekConsultant/TrainerCommented:
Run Set up your Internet address wizard form SBS console.

Set up your Internet address
rsmcomputerAuthor Commented:
David: We already have the SSL cert installed and functioning properly.  As stated in the subject, I need direction for changing the domain name suffix on the PDC.
Toni: Does this wizard/tech document apply to a change in domain name on a PDC?
Toni UranjekConsultant/TrainerCommented:
Wizard will let you specify external domain and internal domain and set up DNS accordingly.

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David AtkinTechnical DirectorCommented:
You can't change the domain name of the local network.  The only thing you can change is the Internet Address name which applies to Exchange and IIS.
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