You really, really don't want to do this. What this implies is changing the
Normal style to Justified, which will affect every other style, including
the formatting of envelopes, labels, and every document you create (except
those based on specific document templates). If you really feel you must do
this, modify the Body Text style instead, and substitute a blank paragraph
in that style for the default blank paragraph in Normal style. See
http://word.mvps.org/FAQs/Customization/CustomizeNormalTemplate.htm