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In our environment, we have one PDC server and one BDC server on NT. Which one do I need to upgrade first to Windows 2000? Can I upgrade the BDC first and do the PDC after? The network will still be working with one PDC on NT and one on Win2k.
The PDC will need to be upgraded first. The BDCs can be Windows NT 4.0 for a while without a problem. During this time the domain will be running in Mixed Mode. Once all of the BDCs are Windows 2000, then you can switch your domain to native mode.