I've been resisting using outlook all-day free appointments for "anytime today next actions". Not quite sure why. Maybe because thinking about it causes my brain to want to explode... It just seems so wrong somehow to use a free calendar event to track a next action with a due date.
I've recently started doing it and I'm beginning to notice those tasks at the top of the calendar. They bug me until I get them done. That's good. I'm starting to trust this aspect of my system.
Now that I'm using it I find that any things that are at the top of the calendar get my attention. Trouble is, I'm starting to have a lot of them. So many that I forget which ones are complete and which ones are still pending. I suppose I could delete the ones that I do, but I like a visual reference of what I've accomplished during the day.
So I've used Outlooks coloring scheme to track completed anytime today next action appointments. This works best with the add-in but you could do something similar with a custom field and vanilla Outlook.
Right click anywhere on the calendar to open up a menu and select Automatic Formating. Click Add and name the new style something like "Completed Anytime Today Activities". Click Condition and select the advanced Tab. Set a condition of Complete equals No. Click Okay and set the label to a nice flat pale color (such as the brown for vacation). Then when you complete the next action. Click on the complete button in the calendar item and it will appear in a different color to indicate that it's been completed... Probably a blindingly obvious tip, but I thought I'd share...