As indicated, it probably shouldn't make any difference, but given that you
can pick and choose who to do first, and it doesn't matter to you the order,
for grins and giggles, I'd probably do the pdc/s in each domain first, then
other fsmo holders, then the rest. You probably don't have a single label
dns domain name, but just be aware if you do, that with sp4 dns
registrations will start failing;
300684 Information About Configuring Windows 2000 for Domains With
Single-Label
http://support.microsoft.com/?id=300684

--
David Brandt
Microsoft Corporation

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"David Swales" wrote in message
news:55ba01c3e4eb$9e082fd0$a601280a@phx.gbl...
> Only consideration I can think of is ensuring the Exchange
> 2000 server gets matching SPs numbers, otherwise future
> SPs for Exchange won't "take".
> -----
> David
>
> >-----Original Message-----
> >We are about to upgrade all the DCs in our forest from
> SP3 to SP4. We have one parent domain and one child
> domain. Is there any preferred order to do this, such
> as "Do all root DCs first, then child DCs?"?? We also
> plan to string these upgrades over a 2-week period, so for
> some time we will have some DCs with SP3 and some with
> SP4 - any issue with this?
> >
> >I haven't seen anything like this in Microsoft's docs,
> but wanted to ask....thanks!
> >.
> >