Hi,

My forest contain 2 domain (domA.com and domB.com) an 2 subdomain
(sub1.domA.com and sub2.domA.com).

I'm install a Exchange 2007 organization in this forest (in domA.com),
I see is a best practice install a DC&GC in the same site that all
Exchange Servers.

My question is: Is necesary install only one DC&GC in the Exchange
site or is necesary install one DC&GC for each domain in Exchange
site?

Thanks and best regards.

If you do not install a DC for a domain in the same site as Exchange, when 
Exchange needs a DC for that domain it will look outside the site for a 
domain controller, and it will look anywhere.  If that's not a problem for 
you, then you don't have to install a DC in the same site.  If it is a 
problem, for example if a DC exists and it's on the other side of the world 
and Exchange performance would suffer by its choosing that DC, then it's 
probably necessary for you to install a DC in the same site.
-- 
Ed Crowley MVP
"There are seldom good technological solutions to behavioral problems."
..

"chopo chipi" <chopo.chipi@gmail.com> wrote in message 
news:44a7ccee-896c-4431-af6c-a5f1b040bba6@m38g2000yqd.googlegroups.com...
> Hi,
>
> My forest contain 2 domain (domA.com and domB.com) an 2 subdomain
> (sub1.domA.com and sub2.domA.com).
>
> I'm install a Exchange 2007 organization in this forest (in domA.com),
> I see is a best practice install a DC&GC in the same site that all
> Exchange Servers.
>
> My question is: Is necesary install only one DC&GC in the Exchange
> site or is necesary install one DC&GC for each domain in Exchange
> site?
>
> Thanks and best regards.