I've installed exchange 2013 in our current exchange 2010 environment. I've created a test mailbox on a new database in exchange 2013, now when I try to set up outlook, it comes up with the username and server name straight away, but when it gets to the 3rd step which is looking for server settings, it fails and comes up with an error:
Microsoft Exchange is unavailable. Outlook must be online or connected to complete
I've no idea what's wrong. I've installed both CAS and mailbox roles on the exchange 2013 server, the server populates correctly. If I change the server to one of our exchange 2010 servers then it works fine. Not sure what's wrong