You can shared notes with other WebMail users by placing them in groups.
Notes are placed in groups on the notes editing page. To place a note in a group, click on the name of the note in the main notes page to view the note Then click the “Edit Note” link. The note editing page will be displayed. Select a group from the "Group" drop-down menu and click the "Update" button. The note will appear when you view the contents of the selected group.
When a note is created, it can also be assigned to a group using the above procedure.