How can an organization segment user management by region if there are many administrators?

Segmenting user management by region is effectively achieved by delegating administrators to specific Organizational Units (OUs) using the "User Management Admin" system role. This approach allows for a structured delegation of administrative responsibilities, where each regional administrator can be given control over a specific OU. Consequently, they would be able to manage users, groups, and settings pertinent to their designated region without interfering with other regions' administration.

Using different domain names for each region may make it complex to manage users under a unified system and could lead to confusion regarding account ownership and access rights. Limiting administrative access by IP address can enhance security but does not provide the necessary framework for managing users or delegating tasks effectively across multiple regions. Creating regional shared mailboxes can facilitate communication within regions but does not address user management segmentation directly.

Thus, delegating administrators to specific OUs is the most effective and coherent strategy to manage user administration in a geographically diverse organization.