A policy can include multiple versions:
Published version: The currently active version of the policy. This version is applied to any assigned devices.
Old versions: Previously published versions that are not currently active.
Sandbox version: A version that is currently being worked on and has not yet been published as the active version. The Sandbox version is not applied to assigned devices until it is published. A Sandbox version can be applied to devices that are designated as test devices. For more information, see Section 8.0, Testing a Disk Encryption Policy.
The following sections explain how to republish an old version and publish a Sandbox version: