- Local GPO Each server running Windows Server 2003 has exactly one GPO stored locally.
- GPOs linked to sites Any GPOs that have been linked to the site are applied next. GPO application is synchronous; the administrator specifies the order of GPOs linked to a site.
- GPOs linked to domains Multiple domain-linked GPOs are applied synchronously; the administrator specifies the order of GPOs linked to a domain.
- GPOs linked to OUs GPOs linked to the OU highest in the Active Directory hierarchy are applied first, followed by GPOs linked to its child OU, and so on. Finally, the GPOs linked to the OU that contains the user or computer are applied. At the level of each OU in the Active Directory hierarchy, one, many, or no GPOs can be linked. If several group policies are linked to an OU, then they are applied synchronously in an order specified by the administrator.