I am moving from a NT4 Domain to a 2003 domain. I have ordered the new Servers, 64 bit for exchange 2007. 32 bit for the domain controller. from what I read you cant load 2003 as a bdc and promote it as NT4. anyone have experiance doing this exact thing. I have a NT4 domain controller, a 5.5 exchange server, 2 Win 2003 terminal servers, one win 2003 standard server. 8 bdc's at remote locations. 100 or so desktops using nt, win2000, xp.