Exchange server 2007 external URL

I have exchange server 2007 with domain.local and OWA(outlook web access) funtions.
if i look at OWA properties ,there is only one place (internal URL:).

how can i also External URL place?

internal  URL: https:\\domain.local\owa
external URL: https:\\\owa
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Elmar KoschkaSenior System EngineerCommented:
In Exchange Management Console go to Server Configuration -> Client Access and select the tab Outlook Web Access.

Right click and select Properties and type in the Internal and External URL for OWA.

apollo-13Author Commented:
But i have only Internal URL place not External
Elmar KoschkaSenior System EngineerCommented:
You can do it via powershell also:
set-OWAVirtualDirectory -identity "owa (Default Web Site)" -ExternalURL ""

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