http://blogs.msdn.com/teams_wit_tools/archive/2007/04/27/handling-display-name-changes-kb-article-published.aspxA new KB article has been published describing the issues around how TFS handles users' display names being changed in AD and the availablity of a tool to fix these issue. The tool is only available through Microsoft customer support channels. See http://support.microsoft.com/kb/93271en-USCommunityServer 2.1 SP1 (Build: 61025.2)