Azure Active Directory Synchronization Services or AAD Sync is the new synchronization service that will allow customers to do the following:

• Synchronize multi-forest Active Directory environments without needing the full blown features of Forefront Identity Manager 2010 R2.
• Advanced provisioning, mapping and filtering rules for objects and attributes, including support for syncing a very minimal set of user attributes (only 7!)
• Configuring multiple on-premises Exchange organizations to map to a single AAD tenant

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Quelle: MSDN Microsoft