Normal
Standard default on Word for margins is 2.54. I think you can narrow down to 2.0 with no issue. Any narrower than that and the page starts to look quite cramped unless you are using paragraph and line spacing elsewhere in the document, and have a decent text size (e.g. 11). If you are using very narrow margins, font size 10 and little paragraph/line spacing the document is going to look far too crowded.
