I am configuring Exchange 2013 but I have not been able to find documentation on the Autodiscover DNS record. If autodiscover points to the mailserver, and that mailserver goes down, how does it know where to fail over to? Do I need a second Autodiscover record? in the same vein, how many public IP addresses do I need for Exchange 2013? Is it one to handle Autodiscover requests and one for everything else? or can everything be done over port 443 on a single IP address? is there a way to split this out, asking because it appears that our old 2010 infrastructure achieved this (and I don't like it!).