AutoHyphenation Property
True if automatic hyphenation is turned on for the specified document. Read/write Boolean.
Example
This example turns on automatic hyphenation, with a hyphenation zone of 0.25 inch. Words in all capital letters aren't hyphenated.
With ActiveDocument
.HyphenationZone = InchesToPoints(0.25)
.HyphenateCaps = False
.AutoHyphenation = True
End With