With Exchange Server 2010 SP2 Microsoft is reintroducing support for providing different views of the Global Address List to different groups of users in the same Exchange Organization. This is being enabled by the new address book policy feature.
GAL segmentation is important both to large enterprises that want to optimize management of their address lists or create virtual internal organizations as well as service providers that host multiple companies on a single set of infrastructure.
GAL segmentation using address book policies does not on its own comprise a full solution for multi-tenant Exchange hosting. However when paired together with a service provisioning solution such as abrideanProvisorSP , the result is a notable improvement over what was possible with Exchange Server 2007.
This is good news for both service providers and large enterprises who were unable to deploy Exchange 2010 due to the limitations of Exchange 2010 “/hosting mode”.
For more information of GAL Segmentation, see presentation EXL326 from Microsoft TechEd 2011: What's New in Exchange Server 2010 SP2?
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