Lotus Notes is a crime against humanity. In exhibit 001-I we see how Notes wastes your time by managing your time.
Try this in your Notes calendar: click an entry. That entry will be highlighted as expected. Now click it again. Fun game: what do you think will happen? Good software will do nothing – a single click is “highlight” and as the item is already highlighted there’s nothing more to do. Poor software might (wrongly, but at least somewhat sensically) actually take action on the item – open it, present a context menu, etc. Notes says “Nuts to that!” When you click on an item already highlighted Notes assumes that you want to edit the item. But it doesn’t let you. Instead you get the following confirmation message: