Address Book segmentation

Experts,

I have created a hosted Exchange service where Sys admins can manage Exchange through a control panel, creating users, adding OU's etc.

I have a problem however, where new users can see the Global Address List through OWA.  How I intend to correct this is as follows:

1. Create a Universal security group for each Sub-OU and add all users in each sub-OU to this.
2. Add an address list and add the Distribution Security Group to this.

The above process will be done for each Sub-OU created.   I am unsure however how to hide the Global Address List for these sub-OUs... which are all held in the container 'Hosted'.  Any ideas?
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nickmarshallAsked:
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nickmarshallAuthor Commented:
A similar approach was taken to the article provided.
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