![]() You have an integrated on-premises smart card or multi-factor authentication solution.Basic delegation and send-on-behalf-of email functionality.Safe senders and blocked senders on-premises are replicated to Microsoft 365.The ability to move some user mailboxes to Microsoft 365 while keeping other user mailboxes on-premises. ![]() An on-premises Exchange hybrid deployment.Write-back is also referred to as Exchange hybrid mode. When you configure two-way synchronization, you enable write-back functionality so that a limited number of object attributes are copied from the cloud, and then written them back to your local AD DS. By default, directory synchronization tools write directory information only to the cloud. Two-way synchronization must be configured during directory synchronization setup.The ability to add users to and remove users from Microsoft 365 service offerings.Synchronizing GAL information from different mail systems.Fully shared global address list (GAL) between your on-premises Exchange environment and Microsoft 365.Features that are dependent on directory synchronizationĭirectory synchronization is required for the following features and functionality: See Topologies for Azure AD Connect for more information. If you can't consolidate your multi-forest AD DS deployment or are using other directory services to manage identities, you may be able to synchronize these with the help of Microsoft or a partner. Consider deploying Microsoft 365 only in your primary logon forest for your initial rollout of Microsoft 365. Use only in your primary logon forest.Unless your organization has security constraints that dictate the need for separate forests, consider simplifying your on-premises environment. In general, there's more overhead required to maintain multiple forests. If your organization has multiple forests for authentication (logon forests), we highly recommend the following: These are the same attributes that Azure AD Connect synchronizes.įor multiple forests and SSO options, use a Custom Installation of Azure AD Connect.
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