Meging AD and Exchange

Just looking for pointers on this,

two companies both similar set ups exchange 2003 and 2003 AD

was prefering to recreate the domainb users in domaina rather than migrating.  they have quiet a lot of baggage in ther Ad from various attempts at changing things upgrading etc.
300 users so would not take too long

I can use admt too but would rather not.

is there away to get there existing exchange org to join ours? (lose there org)  the mail stores are huge and to move them off to rebuild would be a pain. i guess im saying can i move a server from one org to another?


and is the above a stupid idea is migration better?

down time im allowed about 5 mins on sunday morning :-)

was going to clone all the users redo all the files permissions whilst  the existing system kept going then just switch over. seems ok in practice.

 
mhamerAsked:
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victornegriConnect With a Mentor Commented:
The problem you have is that you don't have any downtime you can use to do the switchover.

Create all the users in your permanent domain (domaina) and exchange mailboxes and then manually export the users' mailboxes one by one using exmerge and reimport them into the new domain. Users will be down for the time it takes to export/import but your network will still be up. If your users can stand not having access to old email, you can switch them over to domaina first then export their email from the old domain and merge it with their new mailbox later.
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