Understanding How System Policies Affect Individual Settings

System policies use an apply-time implementation to affect configuration changes. You can create a policy, define settings for that policy, associate that policy with one or more servers or public folder stores, and then apply the policy. After you apply the policy, the corresponding settings that are specific to that individual object become unavailable and appear dimmed. This is because the policy, not the individual object, now controls those settings. For example, if you create a policy that enables message tracking and apply the policy to an Exchange server, the message tracking options for the server are unavailable. This configuration enables administrators to prevent more changes from being made to settings on individual objects that a policy controls.

Message tracking options disabled on a server