Hi, This should help: http://support.microsoft.com/default.aspx?scid=kb;en-us;278918 Leif "rdan" <rdan@discussions.microsoft.com> wrote in message news:670C7811-3F91-4AD2-8401-2616A5D2144A@microsoft.com... I just upgraded from 2 2000 domain controlers to 2003 domain controlers, 2 years ago someone tried to install exchange 2000 in my company but never used. Now we've bought ...