Outlook 2013 is a better looking program than its predecessors in many ways, but it can be a little hard to distinguish between the messages in your inbox. Luckily, you can add different kinds of line separators right from the settings.
This tip comes courtesy of our friends at How-To Geek, who discovered that if you head to View > View Settings > Other Settings > Grid Line Style you can choose from different separators, like a dotted line, dashed line, or a solid line. It's a small change, but one that makes your inbox a little easier to scroll through. Hit the link to read more.
How to Create a Clearer Separation Between Each Email in Your Message List in Outlook 2013
| How-To Geek