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.