OfficeTalk uses different colours to represent the status of appointments in the Group Chart View. The background colour of the rectangle is normally light blue. If an appointment was created by scheduling a task then the colour of the appointment may change depending on the status of the task. If the task is overdue then the background colour of the appointment will turn red. If the task is completed then the background colour of the appointment will turn green. This colour coding is very useful for anyone who wishes to see, at a glance, the status of all the ongoing scheduled tasks for a particular group of users.