Custom Global Address Lists (GAL)

Experts,

I am creating a Hosted Exchange service on Windows 2008/Exchange 2010.  I have read numerous articles explaining the process to create additional GALs and limiting access.  I'd like to limit the access to the Default Global Address List.

Using Exchange powershell I first create a new address list

New-GlobalAddressList -Name "new" -RecipientFilter { (MemberOfGroup -eq $group) }

The $group value references the a Distribution Security Group, thus allowing all users who are in this group to access the 'new' GAL.

Unfortunately this doesn't work - Ideally I would like to create a recipient filter for an Organizational Unit, where each organisation is held under a unique OU name.

Tricky one this, please note that I have read the majority of articles out there!
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nickmarshallAsked:
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dhruvarajpCommented:
here is how you configure multiple gals
http://technet.microsoft.com/en-us/library/bb936719(EXCHG.80).aspx 
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nickmarshallAuthor Commented:
Thanks for the link, this was one I haven't looked at.  

Testing the system with no custom Offline Address Book created per organisation still gives me the Global List.  Do you know if Outlook uses the OAB in displaying contacts?
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nickmarshallAuthor Commented:
Article showed alternative approach for 2010
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