I'm in the process of migrating mailboxes over to exchange 2013 server from exchange 2007 server. Mailflow is still configured through exchange 2007. I migrated a single mailbox from ex2007 to ex2013 and attempted to connect from a 2007 client and I can't seem to do it. The client computer is running Win8.1 Pro 64bit with Outlook 2007 sp3 + Nov 2012 patch. I'm not exactly sure how the email profile should be configured in order to connect. I'd like to get this worked out first before I continue on with the migration. I haven't configured a new owa certificate for ex2013 yet because I was thinking I could test LAN connectivity first before I redirect the OWA flow. Some guidance would be appreciated very much. Thanks.