
In the pane on the right side of the screen, select Apply to X more instances of this file, and then select Undo.Review and manage remediation actions in Office 365 On the History tab, select a file that has a Quarantine file Action type. To remove a file from quarantine across multiple devices Make sure to select items that have the same Action type. On the History tab, select the actions that you want to undo. In the pane on the right side of the screen, select Undo. On the History tab, select an action that you want to undo.

In the Action center, on the History tab, you can undo any of the following actions: Action source If you've determined that a device or a file is not a threat, you can undo remediation actions that were taken, whether those actions were taken automatically or manually. For more information, see Approve or reject remediation actions. In addition to using the Action center, you can also approve or reject a remediation action while reviewing an incident. You now have more options to review and approve/reject a remediation action.


You must have appropriate permissions to approve or reject remediation actions.
