Azure AD Connect: Version 1.4.X.0 key Takeaways for Admins.

This version of Azure AD Connect will only sync Windows 10 computers that are correctly configured to be Hybrid Azure AD Joined. Azure AD Connect should never be syncing down-level Windows devices. Any devices in Azure AD previously synced incorrectly will now be deleted from Azure AD. However, this change won't delete any Windows devices that were correctly registered with Azure AD for Hybrid Azure AD Join.

Using an Enterprise or Domain admin as the connector account is no longer supported in new AAD Connect Deployments. Current AAD Connect deployments using an Enterprise or Domain admin as the connector account will not be affected by this release.