Deadline for tasks
In the event that a task is to be completed within a certain period of 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, select the checkbox next to Deadline. Another line Due on will then be displayed, in which you can specify the date and time of the deadline
If you have entered a deadline, the task will be marked red in the list view of the tasks 3 days before the deadline expires. The red color is intended to illustrate the urgency.