How to Create a Clearer Separation Between Each Email in Your Message List in Outlook 2013

If you have a long list of emails and you’re having difficulty distinguishing among the individual emails in your list, you can select a grid line style to display between each of the emails. This can improve the visibility of each email in your list. via Pocket http://www.howtogeek.com/173201/how-to-create-a-clearer-separation-between-each-email-in-your-message-list-in-outlook-2013/