How do I have 2 separate address lists in Exchange 2007

I have two different Exchange domains. and  I noticed that when I log in as I can see all the addresses from domain1 and domain2.  How can I keep that separate?

I looked under the Exchange Management Console -> Organization Configuration -> Mailbox.  I created a new Address List (domain2).  But, I can't seem to figure out how to make that stick when I go into OWA.  I still see Default Global Address List.

I know I'm missing something.  But, I searched the KB and nothing popped out.
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Following link should answer your query
White Paper: Configuring Virtual Organizations and Address List Segregation in Exchange 2007
baldy74Author Commented:
I must be missing something.  I still see both of the company's contact info when clicking the "To" button in OWA
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