I need to know where I can obtain information that is sufficently detaied that will allow me to modify our current bricks level backup. My backup of users contains mailboxes of individuals who have left and I want to delete them. In the past when I have deleted the mail boxes, I get errors (E8604) in the activity log regarding those deletions. I assume that I must delete them from the bricks level, but do not have the knowledge of how too. Is there a good bricks level for dummies book? We currently run an NT 4.O systems with arcserve 6.61 and Exchange 5.5