How do you make Private items in your Outlook 2003 calendar automatically appear in a different colour from other items? It's easy to have items in different categories automatically appear in different colours, but the Private setting isn't a category.
The answer is rather buried away, so here's a note to help me remember in future and in case anyone else finds it useful:
Go to View / Arrange By / Current View / Customize Current View
Go to Automatic Formatting
It's then the Sensitivity setting you need to select for your rule
Next question: why did Microsoft decide to bury this fairly obvious customisation so deep, and in particular call it "Sensitivity" rather than, oooh, "Private", which is after all what the Calendar item screen calls it?
Congratulations on not giving in. A lesser man would have let it rest... years ago.
I can answer your question on sensitivity - they're using the language from the email bit of Outlook. If you compose a message and go view > options, there is a sensitivity box there which matches the list you see in your example above!