I have a client who migrated from Exchange 2003 to Office 365 in March 2012. The migration was handled by a contractor who was there for three months for the migration and left in April 2012. The migration consisted of approx 100 users and according to the Ops Director went without any major hitch.
The client is totally Office 365 and not in a hybrid solution. Post the migration the IT department did a P2V of the physical Exchange server then recycled the physical box. Following this the IT department needed the resource on the VMWare ESXi server so backed up the Exchange Mailbox Stores using Symantec Backup Exec (to tape) then deleted the VM (I know - why they did it that way I have no idea. They should have used Veeam to backup the VM!!).
So here is the issue. The CEO had a large mailbox on the Exchange 2003 server (close to 25GB) Large mailboxes where one of the reasons they moved to Office 365. Now the CEO needs copies of emails from 2010-2012 but they are not in his Office 365 mailbox. I know they were on the Exchange 2033 side because there are Sent Items, where he has replied to the Inbox email (the ones that are missing). But for a legal case they need the Inbox Items.
So, I have the LTO tape with the mailbox stores.
My question is - do I have to restore those mailbox stores into a (new) Exchange 2003 server (that will be setup for this purpose) or can I import the Mailbox Stores into Exchange 2010 or 2013??