Moving the Mail Store

Hi, I have a new G5 XServe running 10.3.4 server. I want to mave the mailstore from the default location to another volume on the server before my clients start connecting. I tried following directions on page 37 of Mail Service Administration documentation but no new mail store folders appear in the location I specify. Form my searches it appears either the maunual is wrong or this functionality is broken. Has anybody donw this successfully? Can anyone advise how I can change the mail store location please? Thanks, buckster.