You can attempt to recreate deleted ADAM/AD LDS objects after they have been purged from the Active Directory Deleted Objects container by restoring the object from a prior ADAM/AD LDS backup.
To recreate purged ADAM/AD LDS objects
On the navigation bar, click the down arrow next to Restore.
In the View by Resource pane, double-click Active Directory Application Mode.
On the Properties pane, under Settings, click Microsoft Active Directory.
Check Recreate deleted objects that cannot be restored from the Active Directory Deleted Objects container.
Click Run Now to start the restore job or select other restore options from the Properties pane.
Any Active Directory or ADAM/AD LDS object or property that is selected for restore will overwrite existing objects and properties, even if you selected Skip if file exists or Skip if existing file is more recent on the General Restore Job Properties dialog box.
Use the ADSI Edit application to reset the object's user password and re-enable the object's user account.
Recreating purged Active Directory objects