Stylin' a Word Comment Balloon
If you work with Word's Comment feature, you may find that the comment-balloon text is too small to work with, or you may just want some variety. To modify the style, choose Format > Style. From the List pop-up menu, choose All Styles. Select Balloon Text from the Style list. Modify the style as you like, and then click Apply. I like Arial Narrow, 12 point.