After following this article I have found that each company user can no longer see any of the address lists whilst in Outlook. The following command found in the "Create a Security Group for all Hosted Groups" section seems to hide these:
Add-ADPermission –Identity “CN=Address Lists Container,CN=Contoso,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=Contoso,DC=com” –User “All Hosted Groups SG” –AccessRights ReadProperty -Properties "Open Address List" –Deny
I have double checked all the commands entered with no luck. One thing I have noticed in the article section "Modify Permissions on the Address List" the first line reads:
"Use the following procedure to modify the default permissions on the All Address Lists container."
Although there are no commands following this that actually modify the permissions on the "All Address Lists container". Is this just merely a typo or is there a command missing.
If anyone could assist with this, thanks in advance.