"The purpose of the SharePoint User Utilities (WSSUserUtil and SPSUserUtil) is to assist SharePoint administrators with performing user maintenance activities for SharePoint Products and Technologies (which includes Windows SharePoint Services 2.0 and SharePoint Portal Server 2003)
New and Improved Features
New! - 100% Full Fidelity User Migrations using the new MigrateUser() APIs
New! - Update feature to synchronize existing SharePoint user Display Name and Email Address with current values in Active Directory, or values in mapping file
New! - Rich XML export of User Security settings for complete site collections in WSS and Portal Server areas
New! - Interface matches familiar STSADM syntax
New! - “Add” feature to add users en-masse to webs, entire web hierarchies, complete site collections.
Improved - Security Analysis
Improved - “Clone” account settings. (MySite relocation to new owner, alerts remapping [Both WSS and Portal])
Improved - Delete feature can delete users on targeted webs, or automate deletion from complete site collections based on map file."