A deferred update is a feature or piece of functionality that is part of a system update which is not activated when the system update is performed. The administrator decides when or if to apply deferred updates. Updates not applied during a system update, are still available during successive system updates. You cannot select individual updates to apply, when you choose to apply deferred updates, you can apply all or none of the updates. After you apply an update, you cannot rollback to an earlier system software version.