The need to preserve digital information is becoming a key business requirement, simply because of the volume of critical business information that transits through digital sources within a business today. The requirement to preserve digital information has surfaced in the event of legal proceedings. A business may be served with a discovery notice as part of legal proceedings that compels them to provide all information pertaining to a specific matter under investigation.
One of the ways that Exchange mail servers can preserve information in a users mailbox is via the Litigation Hold facility. Placing a mailbox on Litigation Hold means that it automatically preserves the information in that mailbox, irrespective of what the end user may do inside that mailbox.
For example this would mean that even if a user deleted information from their mailboxes, such as an email, it would be retained in an administration area and therefore recoverable using an eDiscovery search by a user with appropriate rights. However, Litigation Hold should not be seen as a way to backup items in user’s mailboxes, it is designed primarily as a compliance mechanism.