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Exchange cross forest migration and install two organization in same domain.

Our current environment is as below

Site 1 ABC.com
2003DC1
2003DC2
Exchange server 2003

Site 2 XYZ.com
2003DC1
2003DC2
Exchange server 2003
Exchange server 2003

And we need to merge two domains and for that we have plan to do cross forest migration.
We will move all users and mailboxes from ABC.com to XYZ.com  using ADMT tool.
Once we will move all in XYZ.com domain then we will keep one DC of XYZ.com domain and Exchange of XYZ domain at Site 1.

Our query is that shall we install two different exchange organization in XYZ domain?
What about the ABC.com Email SMTP ? Now we have given ABC.com email address to all the clients and after the cross forest migration it will XYZ.com. i.e admin@xyz.com.

 If client will send email on admin@ABC.com then how can we able to access that in xyz.com domain?

Kindly suggest.
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rigelnet
Asked:
rigelnet
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3 Solutions
 
rigelnetAuthor Commented:
For mote detail,
Both site are connected with The MPLS line and domain trust is configured with both site. We are able to ping and access both sites.
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Simon Butler (Sembee)ConsultantCommented:
You cannot install two Exchange orgs in a forest. It is one forest, one org.
Cross forest on Exchange 2003 is pretty much impossible - it isn't something I would even consider, particularly for the age of the system.

Instead I would be looking to upgrade both sites to Exchange 2010 or 2013, then cross forest from those versions instead. It may seem more work, but cross forest on Exchange 2010 and higher is very easy.
That would also give you an opportunity to eliminate public folders.

When it comes to email addresses, Exchange doesn't really care. If you have two domains then you can have both domains in one Exchange org, then use email address policies to manipulate who gets what. However remember that when a domain is added to Exchange, Exchange presumes it is responsible for all email for that domain.

Simon.
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rigelnetAuthor Commented:
Ok. First I will upgrade my Site 2 with Exchange 2010 and move all mailboxes in a exchange server 2010 and will decommission of 2nd exchange server of site 2 after that my scenario would be as below

Site 1 abc.com
2003 DC - 1
2003 DC -2
Exch 2003 -1

Site 2 xyz.com
2003 DC - 1
Exch 2010 - 1

after that I will do cross forest migration from exchange 2003 to exchange 2010 and also move all users and computer to the xyz.com
then I will remove the 2003 DC1 ,2003 DC2 and exch 2003 from site 1, abc.com

Is that correct?? Let me know if any change.

Furthermore, I would like to receive emails for the xyz.com mailboxes using admin@abc.com smtp. Is that possible?

for ex. I have mailboxes at site 1 abc.com
admin@abc.com
ron@abc.com
both are moved to xyz.com using cross forest migration.
Now obviously its smtp will be changed to admin@xyz.com and will receive email if anyone send it on admin.xyz.com. But  if anyone sent emails on admin@abc.com then is it possible to get email in admin@xyz.com mailbox ?
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Simon Butler (Sembee)ConsultantCommented:
I was referring to both sides of the cross forest being upgraded to Exchange 2010.
As for the two domains - just add the second domain to the list of Accepted Domains and then add the addresses to the accounts as required.
However remember that by default, once a domain is added to the Accepted Domains list that Exchange presumes it is responsible for all email for that domain. You will need to work out a strategy for sharing the SMTP address space.

Simon.
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rigelnetAuthor Commented:
ok thanks. furthermore, I will add abc.com as an accepted domain in xyz.com server. then what will be the steps to add the abc.com smtp in xyz.com. I need to add for the bulk users.
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Simon Butler (Sembee)ConsultantCommented:
Either an email address policy, or you will have to do some kind of export of the old information and import to the new user accounts.

Simon.
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rigelnetAuthor Commented:
Gr8. Thank you so much
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