This is the process to change the default reply color from blue to black when replying or forwarding an email in
Microsoft Outlook 2013.
First, go to File and then click Options:
Next, click Mail in the left side navigation, then scroll down and click the button for Stationery and Fonts:
In the "Replying or forwarding messages" section, click Font:
Under font color click the color menu drop-down and pick black:
After picking black, or any other color you prefer as your default reply color, click OK three times to save and close the settings windows.