In the event that a task is to be completed within a certain time because your customer has set a deadline , you have the option of setting a deadline for this task in the onOffice enterprise edition.
To set a deadline, you must activate the checkbox next to Deadline. A further line Due on is then displayed in which you can specify the date and time of the deadline.
If you have entered a deadline, the task will be highlighted in red in the list view of tasks 3 days before the deadline expires. The red color is intended to emphasize the urgency.