From: Computerpilot on 12/04/2002
I am not completely sure about Outlook 2002. I run Exchange Server 2000 and Outlook 2000.
Might I suggest the most recent updates for Exchange server 5.5. I am not sure of its compatibility with Outlook XP.
I still think this behavior is by default. When you post a message to a newsgroup or public folder, your active directory/global user name should show up as the 'poster'. I would imagine that if you had the capability to change the 'FROM' field, you would be able to post a message from anyone at your organization. That may be bad. Therefore, it could be an issue of security settings in Exchange or a new feature supported with Outlook XP. I would check your security in Exchange server to see exactly what you can do in the public folder in question.
Just some ideas.