This tip applies to form designers who want to change the default print margin on a form using InfoPath 2003 since the Service Pack 1 release allows designers to change these properties in design mode from the View Properties dialog.
So, if you do not have the Service Pack 1 installed you can still accomplish this by following these steps:
marginUnitsType="in" leftMargin="0.25" topMargin="0.5" rightMargin="0.25" bottomMargin="0.5">
Notes: marginUnitsType can contain either in or cm. The rest of the margins are interpreted based on those unit types.