Always show comment highlights in Word 2013
Solution 1:
In the Review tab, go to the Tracking section.
There, you'll see a drop-down menu. It probably says Simple Markup. Change it to All Markup, and you'll see the commented sections highlighted.
Here is the official Microsoft explanation. http://blogs.office.com/2012/08/28/comments-and-revisions-in-word-2013/
Screen (in German):
Detail (in English):
