By using filtering, you can control which objects appear in Azure Active Directory (Azure AD) from your on-premises directory. The default configuration takes all objects in all domains in the configured forests. In general, this is the recommended configuration. Users using Microsoft 365 workloads, such as Exchange Online and Skype for Business, benefit from a complete Global Address List so they can send email and call everyone. With the default configuration, they would have the same experience that they would have with an on-premises implementation of Exchange or Lync.
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