[Prepare a nonroutable domain for directory synchronization - Microsoft 365 Enterprise | Microsoft Learn](https://learn.microsoft.com/en-us/microsoft-365/enterprise/prepare-a-non-routable-domain-for-directory-synchronization?view=o365-worldwide) [Step 1. Determine your cloud identity model - Microsoft 365 Enterprise | Microsoft Learn](https://learn.microsoft.com/en-us/microsoft-365/enterprise/deploy-identity-solution-identity-model?view=o365-worldwide) [Step 2. Protect your Microsoft 365 privileged accounts - Microsoft 365 Enterprise | Microsoft Learn](https://learn.microsoft.com/en-us/microsoft-365/enterprise/protect-your-global-administrator-accounts?view=o365-worldwide) [Step 3: Protect your Microsoft 365 user accounts - Microsoft 365 Enterprise | Microsoft Learn](https://learn.microsoft.com/en-us/microsoft-365/enterprise/microsoft-365-secure-sign-in?view=o365-worldwide) [Prepare for directory synchronization to Microsoft 365 - Microsoft 365 Enterprise | Microsoft Learn](https://learn.microsoft.com/en-us/microsoft-365/enterprise/prepare-for-directory-synchronization?view=o365-worldwide)