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In a Windows NT domain, I have two BDCs. If I upgrade one of the BDCs to a Windows 2000 server, will it still be functioning as a BDC for Windows NT or not?
You must first upgrade the PDC to Windows 2000 prior to upgrading the BDCs. Once you have done that, you can upgrade the BDCs to Windows 2000 DCs. They will be able to authenticate users using the NTLM (NT LanManager) communication method until you switch the domain to Native Mode on the upgraded PDC. Since there is no NT 4.0 PDC anymore, there is no NT replication-it is all Active Directory.