Change domain name 2008.


I have 2008 Domain environment consists of the following :-

Exchange 2010 SP3 + DAG.
SQL Server 2012 + Cluster.
Oracle 11g integrated with A.D.

another 24 services ( home made ) integrated with A.D based on & PHP & Drupal and Java for authentication.

my current domain is   we must change it to  also that will reflect to Exchange for sending and receiving .

for Exchange a new accepted domain and email address policy enough ?

can i use UPN suffix to keep the existing domain and make all users  authenticate using UPN also the new users take the UPN ?

can i use upn suffix for domain join ?

please advice.
Who is Participating?
Will SzymkowskiSenior Solution ArchitectCommented:
Adding a UPN Suffix does not change the domain name and or NetBIOS name of the domain. If you want to completely change the domain name I would highly recommend creating a new forest and using the ADMT (AD migration tool) to migrate your objects over.

ADMT does not move Exchange Objects so you will need to use the Prepare-MoveRequest.ps1 script as well.

As you can see this is a very involved process.

If you change the Domain name for the Forest you risk breaking internal applications like Exchange, SQL or as you have stated other home-grown applications

As stated already changing just the UPN but i would highly recommend not changing the actual name of the Forest Root Domain. If you are still going to proceed that way i would do this as a test first to see if anything breaks.

Simon Butler (Sembee)ConsultantCommented:
You cannot change the actual name of the domain.
However from an Exchange point of view, adding the new domain to the list of Accepted Domains, Email address policy then adjusting the SSL certificate to include the new domain for both mail access and Autodiscover will be fine.

The UPN can also be adjusted and as long as the application supports UPN authentication, that will work fine as well.

Mohammed KhawajaManager - Infrastructure:  Information TechnologyCommented:
There is no need to rename the domain.  There are numerous AD domains out there where the email domain name is different (i.e. widgets.local is AD domain and is the email domain).  You can add another email domain and in AD users can sign-on using their NetBIOS name, UPN or email address.  This should not be an issue.  If you wish, you could change the UPN to the new name.
Simon Butler (Sembee)ConsultantCommented:
Changing the name of a domain with Exchange installed is not supported. It WILL break Exchange.

BahloulAuthor Commented:
Thanks Simon for your support .

Thanks Mohammed Khawaja for your support.

Thanks Will,

could you provide trusted full scenario for Cross forest migration, during users and Exchange objects migration any impact for Email Access ? thanks for your support.
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