SQL Server implications of leaving and rejoining a domain

Hi Experts. I have a users mailbox/an email that I need to restore.Unfortunately the email is on a tape that was backed up with CA Arcserve 11.5 SP3 before an upgrade. The issue is we are now running Exchange 2010 and Server 2008 R2 domain. I dont think it'd be possible to install Exchange 2003 in the same domain(correct me if Im wrong) and do the restore neither could I restore to pst or msg files(correct me if Im wrong).I created a fresh Exchange 2003 server (SBS 2003) and installed the Exchange Agent outside the domain on a seperate network. I then took the ArcServe server and plugged it into the other domain. When I try and run the restore Arcserve is not seeing the Exchange server as a likely destination however it can see files shares and SQL etc. I suspect it could be a domain issue since when I installed the Backup Manager on another machine in the new network it can see the Exchange destination. The problem is the server with ArcServe also holds the SQL Server databases for the organisation. What are the implications of leaving domain A, joining domain B and trying the restore then when I finish rejoin domain A. Would that break my SQL or cause any other issues? - And yes, according to the CEO the email is that important :)
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Aaron ShiloConnect With a Mentor Chief Database ArchitectCommented:
your main issue will be with your server logins
they will be broken.
takwirirarAuthor Commented:
Thanks for quick response. You mean server logins for SQL? Do you have any suggestions on how I can get around this?
Aaron ShiloChief Database ArchitectCommented:
read this guide for the aftermath of switching domains. :
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If you can restore the base EDB files, you can use a product like Ontrack PowerTools to restore the messages

I have used this product several times to restore into either PST or current mailboxes, the entire contents of an exchange database for which I not longer had an exchange server or matching domain.

It can be expensive, but it works.
takwirirarAuthor Commented:
This is the issue, ArcServe will not allow me to even restore the EDB files
takwirirarAuthor Commented:
Answers the question. The problem was with the RPC service. Restarted it and managed to restore the items.
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