A policy can include multiple versions:
Published version: The currently active version of the policy. This version is applied to any assigned users and 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 users and devices until it is published. A Sandbox version can be applied to devices that are designated as test devices. For more information, see Testing Security Policies.
The following sections explain how to republish an old version and publish a Sandbox version: