In the event that a task is to be completed within a certain time because your customer has specified 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. Another 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.