Current Exchange 2003 Server Joining a Vanilla Domain - After Single DC Fail

May have to build a new Domain Control Server if unable to rebuild current single DC - also may have difficulty gaining FSMO roles so may have a total clean domain install.  Therefore I wanted to establish now, how involed the process would be if I eventually have to decide this is the only possible solution.
WBreenAsked:
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craskinCommented:
this might help you, but you probably found this in your own research.
http://www.hftonline.com/forum/showthread.php?t=4369

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craskinCommented:
if you can restore the users to  your vanilla AD it shouldn't be too difficult to reconnect the mailboxes to the users. exchange 2003 has a wizard for reconnecting mailboxes, though i fear it may have to be done 1 at a time.
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WBreenAuthor Commented:
In the case where the users can't be restored from the previous domain, along with the FSMO roles etc.  Will Exchange be able to join this domain and continue to function without losing data / mailboxes?
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craskinCommented:
in principle, that's the whole reason exchange keeps its own database - so that it's isolated from the trouble you're having right now. the problems i'd anticipate you running into would basically be permissions problems to the mailboxes once you've connected exchange to the new domain which would probably also have to be set on a per user basis. i don't envy the mess you're in, but you really ought to have backed up your AD on at least a monthly basis.
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WBreenAuthor Commented:
The thing about the current situation is that I do have backups of the AD etc but, they don't seem to be much help even on a new build server.  Keeps failing as per the old server.  Am still looking at what the possible cause is but, wanted to know possible alternatives if need to build from scratch.

With regards to restoring users, what is the way to do this from the backup (hoping it works in this case).
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