We are in the process of migrating from ex2007 to ex2013. We will continue to use Outlook 2007 client but access OWA 2013.
We are currently running EV10.4. I will be installing the 10.4 hotfix for mixed environment compatibility.
What else needs to be done on within EV and/or installed on the Exchange 2013 servers to successfully migrate mailboxes to ex2013 and successful access to vaulted messages.
On a related topic, in preparation for the migration, we recently migrated ISA rules to barracuda load balancers. OWA clients are redirected to ex2013 which routes them to ex2007 if the mailbox is still on 2007. After doing this, vaulted messages are not available via OWA. It was our understanding this is a simple reroute.
I did not install the current EV environment so I'm just becoming familiar with EV deployment. Any direction is much appreciated.