Hi Paco,

You can either upgrade the PDC to W2k3 and leave in mixed mode
or you could create a W2k3 domain and a trust with existing domain.

"Paco Gaspar" <noesbueno@microsoft.com> wrote in message news:
> Hi,
>
> I'm the systems administrator of my company. The domain consists of one
> PDC
> controller and 6 BDC's, of course, under Windows NT.
>
> Because of a new software that we need to use, we need to install the
> Active Directory for this domain. But the financial department, doesn't
> want to expend so much money in migrating all the controllers to Windows
> 2003.
>
> The thing is that I know that I can upgrade the whole domain by upgrading
> to Windows 2003 all the domain controllers under NT, but I don't know the
> consecuences of installing a unique Domain Controller under Windows 2003
> with Active Directory, co-existing with the rest of domain controllers
> under NT.