I have a business rule that needs to needs to remember the current setting of an attribute (msDS-PrimaryComputer) after the attribute is changed. This attribute stores the computer that is assigned to the user and which VLAN group the computer is assigned to. The purpose behind remembering the old system name is to clear the description of the system, clear it's group memberships and set it to retired/redeploy/etc. The business rule is set to take action after a change to the user settings which of course means that the attribute has already changed.