What if you used the last tip to dismiss reminders and discover you needed some of the reminders left on?
Unfortunately, Outlook doesn't have an easy way of showing you what reminders were dismissed. You can create a view that includes the modified field, then sort or filter by it to see when the items were dismissed. It's not 100% accurate as many things can modify the item, but if you do this soon after dismissing the reminders, it should be 100% accurate.
You can also use Instant Search in Outlook 2007 or Outlook 2010. Use modified:date format in the search field.
Published December 3, 2004. Last updated on June 26, 2013.