You can define a task as a result of which specific thin client will be deleted from the UMS database. Which thin clients are deleted is defined through the criteria of a view. Example: All thin clients that have not been booted for more than a year.
The mail will be sent to the mail address defined under Mail Settings > Mail Recipients. Further information can be found under Mail Settings.
This setting is only relevant to HA (High Availability) environments.
Further information on the public holiday lists can be found under Misc.