ADPREP on Windows 2000 Server when Promoting Windows 2003 R2 Server to Domain Controller
I installed a Windows 2003 Server R2 onto a new box and then ran ADPREP using CD1 of the 2003 media on the old Windows 2000 Server running adprep /forestprep and adprep /domainprep and both completed without errors. I then tried to promote the new 2003 server to a domain controller and it failed saying that ADPREP needed to be run on the source (2000) server, which I already did. Here I found that you need to run ADPREP from CD2 from the components folder, not CD1. After I re-ran ADPREP with CD2 the 2003 server completed dcpromo without any issues.
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