Exchange 2003 migration to new domain

Hi

Ok here is my scenario domain A is and old Win2k3 domain and needs to be moved to Domain B with users mailboxes from Exchange 2003.
I have set up the trusts and can transfer users from one domain to another using Active Directory Migration Tool. What would be the best method to get Exchange over? Is it  a case of have a temp server to move the exchange mailboxes to then formatted my current exchange server, rebuilding to Domain B and transfering it from the spate box on Domain A to the new exchange on Domain B. If so could someone that has done this give me some more detail info.

Very much appreciated
kev8326Asked:
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MATTHEW_LCommented:
If you have two boxes, just set up a new Exchange server in the new domain, create exchange boxes for the users that you are migrating over, they will be empty to start.   Then use Exmerge to get the mail over from the old Exchange server to the new.
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kev8326Author Commented:
For exmerge to work with the users moved to AD, will i need to make sure the SID is transfered along when the users are migrated?
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MATTHEW_LCommented:
You should be able to use exmerge as long as the account names match.  Your can do one step or two step.  One will dump to PST's and then you can import, the other will do in one straight shot.

Now the only other concern will be public folders.  Do you use public folders, shared calendars, contacts, etc.?

Exmerge does not do public folders, this would only be user accounts.
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kev8326Author Commented:
Also  after i run exmerege will it require the old exchange server to be up and running as i need to reuse that box for the new exchange in the new domain
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kev8326Author Commented:
we do share user calendars but nothing on the side of public folders
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MATTHEW_LCommented:
Domain A and B, are they in the same forest?  You can also do an Exchange swing migration, where you just simply move the mailboxes from server a to server b and then replicate public folders.

http://www.amset.info/exchange/migration.asp
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MATTHEW_LCommented:
Ok.  If there are no public folders, exmerge should work fine then.
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kev8326Author Commented:
Domain A and domain B are different forests, which is why ive created trusts. Will exmerege keep all user calendar details or is it just mail?

If it does allow calendars to be exported into the pst, then i could do an export to another server, remove exchange from the old domain, and rebuild the box to domain B, install Exchange and then run exmerege to get the mail back... sound right?
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MATTHEW_LCommented:
Exmerge will do the whole mailbox, calendar, contacts, mail, custom created folders etc.  You can dump it all to PST and then import it back in.  You can have both Exchange servers going at the same time and go from one to another.
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kev8326Author Commented:
Sadly i cant have them both going as the box that is Exchagne on Domain A also needs to be Exchange on Domain B
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MATTHEW_LCommented:
Well then you can use exmerge to pst and then import back in.  I would make a full backup of your current Exchange server as well before you even start this project.
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kev8326Author Commented:
Many thanks for some VERY quick responses. I will be trying this on my home test environment first and will deffinatley have a backup as we do every night.

Again, many thanks
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