With User Name Mapping, you can create advanced user maps, which associate all dissimilarly named Windows and UNIX users. ...

With User Name Mapping, you can create advanced user maps, which associate all dissimilarly named Windows and UNIX users. Advanced user maps always take precedence over the same user name in a simple map.  You configure advanced user maps from the Create Maps dialog box. To start this process, do the following:    1.  Open the Microsoft Services for Network File System console.   2.  In the console tree, double-click User Name Mapping.   3.  Under User Name Mapping in the console tree, right-click User Maps, and then click Create Maps.