DirSync makes a copy of the local directory and then propagates itself to a Windows Azure cloud tenant Active Directory instance. After that, DirSync runs every three hours to push changes from the on-premises directory to the cloud instance. DirSync only goes from on-premises to cloud. If an administrator were to create a new user on the Windows Azure Active Directory tenant, that user would live only in the cloud and would never be propagated down to the on-premises directory.
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