See my blog about upgrading to Windows server 2008 R2: http://msmvps.com/blogs/mweber/archi...r-2008-r2.aspx
If you choose the way above there is no need to go over Windows server 2003.
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> We would like to upgrade our servers to Windows server 2008 R2.
> Currently we have two Windows 2000 (SP 4) domain controllers, we want
> to replace the Forest Root Domain box with new hardware & upgrade the
> other DC to server 2008 R2.
> I understand it's not possible to upgrade from 2000 straight to 2008
> but is server 2003 still available to ugrade to in between? I'm also
> not sure of what the implications of retiring the Forest Root Domain
> box would be?
> Would the best plan be to add the new 2008 server (domain function &
> forest function level: 2000); upgrade the second box to Server 2008 R2
> (via server 2003?); transfer the roles from the FRD box to the others;
> demote the FRD to a member server then finally raise the forest &
> functional levels of the 2 remaining DCs?
> Any advice would be greatly received?