Windows Server 2008 Interview Question:

What types of Active Directory objects can be contained in an Organizational Unit?

Submitted by: Administrator

Organizational Units can hold users, groups, computers, contacts, and other OUs. The Organizational Unit provides you with a container directly below the domain level that enables you to refine the logical hierarchy of how your users and other resources are arranged in the Active Directory.
Submitted by: Administrator

Active directory objects such as users, groups, computers, OU's, and special objects that are explicitly defined in the schema can be obtained in an OU.
Submitted by: Dana Adams