Sorry, but you are incorrect. I have only one Calendar. When I click on the Properties for that Calendar I see two Check boxes labeled:
Show number of unread items.
Show total number of items.
When I click on Show total I get (660). When I click on Show unread I get (2).
So Shawn76 is correct. The (2) is the number of unread items. Which brings us back to my original question, "What is an unread calendar item?" And how do I find the two that are unread?
Cheers