In this software video tutorial you will learn how to set a milestone in MS Project 2007. Milestone is an important task. Lot many times a milestone is like a goal or deadline to be completed by a particular date. It is defined as a task that doesn't have a duration. To make a milestone, enter a task and under duration, enter 0d. This will turn in to a milestone. To make task in to a milestone, double click on the task. On the next window that comes up, look for and click on the 'advanced' tab. This will bring up the Task Information window. Now check the box next to 'mark task as milestone' and then click OK. And your task is made in to a milestone.