Windows

You will want to install your new computer with NT4 as a BDC. Once installed promote it to the PDC and then upgrade to Windows2000. This will upgrade your NT4 SAM into Active Directory. Your BDC's will receive normal account replication, just as before and continue to function as BDC.
You can then migrate your data files to the Win2k box. There is a resource kit util (scopy, i think) that copies with premissions. Once all data is removed from the old NT PDC you can sunset the box.
You can also use the Active Directory Connector to synchrozine your Exchange Directory with Active Directory. This can be found on the Win2K server CD.

What I would do is this: (assuming you're installing the OS yourself from scratch)

*Install NT Server on the new box, configure as a BDC on your domain. Make sure it syncronizes.

*Take your PDC offline and promote the new PC to PDC

*Run Win2k Setup from in NT. Choose an upgrade install and continue on from there. Your SAM will be the same.

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