You can set a deadline for any project task. This represents a date by which time the project task must be complete. If the task has not been completed by the deadline date, then OfficeTalk will alert you by colouring the project task red in the Project window.
To specify a deadline, bring up the Project Task property sheet by double clicking on the relevant project task. Check the Has Deadline check box and enter a deadline date (and time if required). Press OK to save your changes.