Exch Migration 2007 fail

Recently I started a migration of Exchange 2007 (on SBS2008) to Exchange 2013.  During the process of migration only 8 mailbox out of 26 got migrated and the rest failed.  After a while the DC started acting up and started crashing preventing me from doing anything.  I had to scrap the plan for migration and restore the old server back but with 8 missing mailboxes.  I don't think there is a way to pull the mailboxes from exchange 2013 back to 2007.  What do you think are my options.  Is there a foolproof guide to migrating exchange 2007 (from SBS2008) to exchange 2013 on a server 2012 platform.

Any help with this is appreciated.
Joe JohnsonAsked:
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Why not just pst the mailbox and then disable the user's 2013 mailbox? Then re-enable 2007 mailbox and import the pst.

Microsoft's official migration guide is here:


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Simon Butler (Sembee)ConsultantCommented:
It depends what the reason was for the migration failing.
The most common reason is items are too large or a corrupt item - the log will tell you what the issue is.

Do you not have another domain controller? If you have restored the SBS server then your installation of Exchange and another domain controller is probably invalid and would need to be completely redone. If you did have another domain controller than another option would have been to isolate the new DC and Exchange server, export the content to PST and then import it again after clearing the problems.

Joe JohnsonAuthor Commented:
Thank you
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