How to change the color of unread email in Outlook 2013?

You may change the color of unread email by adding a rule in “Conditional Formatting”.

1. On the “View” tab, click “View Settings”, then click “Conditional Formatting”.
   
2. Select “Unread messages”, then click “Font…” button.
   
3. Under “Color”, select your desired color.
   
4. Click “OK”.