Hello Initially I had 1 PDC running Windows NT and 3 BDCs running Windows NT 4 , 1 member server running on Exchange 5.5 on a NT 4 platform. Also 1 SQL server on Windows 2000 platform. And 2 Citirix server running on Windows 2000 platform 1) I took a BDC offline and then demoted the PDC to BDC 2) Promoted a BDC to a PDC and did an inplace upgrade of Windows 2003 3) I then created 2 more Windows 2003 Boxes and transferred the FSMO roles to one of them 4) I dcpromed the upgraded box and move it off the network I have issues now 1) How do I remove the live BDC and the one I took offline also they are showing as Domain Controllers in Windows 2003 AD? 2) How to I upgrade my Exchange 5.5 to Exchange 2003 on a Windows 2003 box? For Exchange 2003 I wish to insert a Exchange 2003 as part of the same organisation and then remove the 5.5 box .. Do I need to use the ADC connector and if so how do I set it up?