This really depends on how you rename them and how your users access their mail. The automated method using AdminP requires people to access the server (use online versions of mail, File –> Database –> Open, etc.,) to be prompted to accept a name change. Once they accept it, AdminP goes to work and renames all pertinent documents and records. If your users are offline (replicators), they have to go the old school method of sending a request via the Toolbar to the administrator, who then recertifies the ID that is sent in and gets it back to the person. That person chooses an action to merge that new ID into their existing ID. The administrator must then manually change all groups, ACLs, etc.
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This was first published in October 2004