To enable the Overdue Task Alert, you'll need to complete two steps. First, you'll need to set the alert on the individual task, and then you'll need to set the notification for the users who want to receive the alert.
Step 1: Hover over the properties tab, click Property Maintenance, select your property, and expand the Tasks menu.
You can select the task for which you want to enable the alert and then set the alert using the Alert if Left Open field. The task system will send an email alert for tasks left open for more than the time selected.
Once you have set the alert, you can click Save Task.
Step 2: Hover over the users tab, click edit notifications, then select the user whom you would like to receive the alerts
At the bottom of the screen is a check box labeled Overdue Tasks. Make sure the box is checked, and click Save Notifications.
Remember: Users with this box checked under their notification settings will receive overdue task alerts only for tasks selected to send alerts, as set by the system administrator. This feature is best used for supervisor/managerial roles.