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This is possible with careful provisioning. It may require an extreme makeover of you directory security, which could be detrimental to your production environment. Specifically, Active Directory can run in a List Object Mode for this type of solution, and you will likely have to remove the Authenticated Users group from various objects to hide users from one another.
This is in fact the model that application service providers use to host an Exchange 2003 server. If you were to qualify as an ASP and go with the ASP licensing model for Exchange, you would have access to Microsoft's provisioning software (MPS). If your plan is not to be an ASP, then you may have to come up with your own model for provisioning. You can read more about MPS here:
If you want to do it on your own, you can check out the following links:
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Related information from SearchExchange.com:
Learning Center: 20 tips on securing Outlook in 20 minutes
Topics Library: Exchange security
Topics Library: Exchange scripts and programming
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