Last week I have started with the migration of my exchange 2007 to Exchange 2013.
Everything was working fine. 4 days ago, I migrated all mailboxes to the database of Exchange 2013.
To make simple, my new Windows 2012 with Exchange 2013 crashed today and my backup is not usable to restore the exchange database. So All my mailboxes are linked to a database which don't exist anymore and I won't be able to restore it.
I have full backup of my old Exchange 2007 server but all mailboxes are now linked to the new one. Everything is synchronized with Active Directory.
is there a way to do a rollback ? It is possible to restore my exchange 2007 (restore point before the migration of all mailboxes) and make changes in AD to point mailboxes to the old exchange server ? (I know I would loss emails between this time but I don't have other solution).
Thanks in advance for your help