We are in the process of setting up a replacement Exchange 2013 server to replace our current Exchange 2007 server. I have only 1 issue left before I can move users over to the new server. I can not connect to the Exchange 2013 server from outside of our network with Outlook. I can however use OWA to get to the 2013 server.
Does anyone have any ideas on how to access the new server and the old server keeping both online and accessible