I have gone through and done this as I like to categorize all of my appointments so I can see at a glance what is coming up. However, once I did the auto-coloring as described here, and stopped manually categorizing, I no longer see any colors in my "ToDo Bar" or right column. This appears to be because the colors are not actually categories and the ToDo Bar does not display colors, only categories. Any way around this? If not, I will have to go back to the manual assigning of categories.