The first time I upgraded an NT 4.0 server PDC to windows 2000, the forwarders tab on the w2k DC was greyed out and it was suggested that I delete the "." This worked. But I've also read that DNS can be set on a workgroup PC before I upgrade the PDC (they said stand-alone. I'm assuming that a worgroup PC qualifies as a stand-alone) and in this case its not suggested to delete the ".", but instead to change the properties. Why was it necessary to delete the "." in the first case? (because the DNS server was on the DC and not a stand-alone PC?) And what's the preferred method of DNS setup if the PDC upgrade is just going to be temporary and we will eventually have 2 DCs which are clean installs?