Something interesting came up at work recently related to people changing there name due to some form of life event. I never had really researched what would happen if someone changed there name. I really did not know if there was a GUID in AD, so I spoke with one of our network guys. He said that there is a GUID tied to every AD account, so when the name is changed in AD the information does not need to be changed only the name and account name. I wondered if this worked similarly in SharePoint. It looks like all you need to do is run a profile synchronization and the old username syncs to the new username based on the AD GUID (ADGuid property). I am not so sure how well this works with WSS 3.0. If anyone knows add a comment. I hope this helps someone understand profile imports and syncing with AD in SharePoint.