I Mis-configured new Exchange 2010 primary external namespace

I am preparing to migrate from Exchange 2003 to Exchange 2010. I have installed Exchange 2010, but I made a mistake when specifying the primary external namespace. Where do I go to fix it??
mstumpoAsked:
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imgirCommented:
The last section of this link "Installing Exchange 2010" may offer some assistance.
http://technet.microsoft.com/en-us/library/ee332348.aspx

Having never had that issue I can only point you at a Microsoft source to hep you resolve.
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mstumpoAuthor Commented:
I saw the part that says

If you didn't configure a primary external namespace during setup, you'll have to run the following commands to configure the virtual directories for the Offline Address Book, Exchange Web Services, Exchange ActiveSync, Outlook Web App, and Exchange Control Panel. You can do that with the following commands:
Offline Address Book: Set-OABVirtualDirectory <CAS2010>\OAB* -ExternalURL https://mail.contoso.com/OAB 
Web Services: Set-WebServicesVirtualDirectory <CAS2010>\EWS* -ExternalURL https://mail.contoso.com/ews/exchange.asmx
Exchange ActiveSync: Set-ActiveSyncVirtualDirectory -Identity <CAS2010>\Microsoft-Server-ActiveSync -ExternalURL https://mail.contoso.com
Outlook Web App:Set-OWAVirtualDirectory <CAS2010>\OWA* -ExternalURL https://mail.contoso.com/OWA
Exchange Control Panel: Set-ECPVirtualDirectory <CAS2010>\ECP* -ExternalURL https://mail.contoso.com/ECP

My problem is when I did the setup, I told it Mail3.domain.com. I wonder if I use those commands above with the correct "mail.domain.com" if they'd over-write what I put in before.
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