- A group of users that needs to have more stringent Account Password policies
- A group of users/departments that needs to be separated for legal reasons – for example a branch of the company that is being spun-off as an independent business.
- There is a separation of the IT staff. I am partial to centralized staffing and operations, but some companies have departments or groups that must run independent of one another based on the specific technology needs. In some cases, the IT staff is separated by geographical regions, and more specifically, time zones.
- Security issues. HR is a typical example. However, the level of security of a set of servers can be achieved without an additional domain.
This was first published in January 2005