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AD forest and Exchange Org split

We are trying something that is explained below - Expect help to explore and implement the same. All your assistances are appreciated.

Current:  Single AD forest (A.com) - child domain (b.a.com) where exchange is installed. All these servers are geographically split into 6 locations. All DCs & Exchange servers are on Windows 2003 SP2. All Exchange servers are Exchange 2003 SP2. We have clusters for mailbox servers and NLB for fornt-end servers.

New setup: Current AD forest and exchange org remains same. But new AD forest will be created and new exchange org will be created under this new AD forest. There won't be any trust between these two AD forests. Our requirement is to move few department user's mailbox into this new AD forest and Exchange org. New setup will have Exchange 2007 on Windows 2003 64-bit.

Queries:
1. Is this possible?
2. If we create temporary trust between these AD forests and break it later, what would be the effect?
3. Can we use ExMerge to export and import the mailboxes from one Org to another?
4. If we migrate our current environment to Exchange 2007, will it help to accomplish this task?

Your suggestions are highlt apprecitaed.

Thanks,
>>>>Veera.
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Veerappan Sundaram
Asked:
Veerappan Sundaram
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4 Solutions
 
Rajith EnchiparambilOffice 365 & Exchange ArchitectCommented:
Veera,

Are you creating this new forest just to have Exchange 2007 installed? If so, you don't need that. Though that will work, it involves a hell lot of work!

Install a Windows 2003/2008 X64 in your existing domain and then install Exchange 2007 sp1 on that. Then follow the migration guides that is available on the internet.

Rajith.
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Veerappan SundaramSenior Technical ConsultantAuthor Commented:
No it is not for this migration. There is logical seggregation within the company and we want it to have 2 different entities - as if it is 2 different companies. In simple terms, we can say it as split.
>>>>Veera.
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abhaighCommented:
1. yes, it is possible

2. no long-lasting lingering effects

3. yes

4. it's not going to make things simpler and easier, no - I'd stick to the environment you are comfortable with before upgrading.

it's better to limit the number of changes made at any one tim to as few as possible - it cuts down on the potential mistakes, plus it makes obvious errors easier to locate

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Veerappan SundaramSenior Technical ConsultantAuthor Commented:
Thanks Abhaigh!
If we use Exmerge, we can extract all the mailboxes at one shot (yes, we have enough space on our storage). The Q? is, while importing is it possible to do so - on the different forest?  If yes, steps please.
>>>>Veera.
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abhaighCommented:
yes - you can export all the mailboxes in one shot - though you might want to invoke several instances of exmerge to make the process run faster

importing you can do the same thing - only thing that matters is if the account you are using to import under has the appropriate permissions
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Veerappan SundaramSenior Technical ConsultantAuthor Commented:
We are exporting from a.com domain with xyz exchange org and importing into z.com with abc exchange org. There is no trust. Then how Exmerge will match these PSTs against new AD accounts?
>>>>Veera.
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abhaighCommented:
if the directory name is the same in both domains exmerge will find the mailboxes automatically
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Veerappan SundaramSenior Technical ConsultantAuthor Commented:
Thanks Abhaigh!
I'm going to try this in our test environment and update you in couple of days.
>>>>Veera.
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Veerappan SundaramSenior Technical ConsultantAuthor Commented:
Thanks Abhaigh!
It worked. But the display name should remain same on both domains.
All the FROM and TO addresses are not showing any useful information, because the old GAL is not available here in this domain. Is there any way to have this information populated in the new domain?
>>>>Veera.
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abhaighCommented:
If you extract the LegacyExchangeDN for each of the accounts in the old domain and add them to the accounts on the new domain as an extra X500 address - this should resolve the problem
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Veerappan SundaramSenior Technical ConsultantAuthor Commented:
Once again thanks! I will try that.
>>>>Veera.
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Veerappan SundaramSenior Technical ConsultantAuthor Commented:
Thanks a lot! Really Good information.
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