We currently have EX2010, with autodiscover.domain, owa.domain, and outlook.domain records in DNS. The outlook.domain is used for the CAS array and would not be modified during this.
We are going to install new EX2013 servers soon. When we do that, we plan to set all the URLs to be the same as EX2010 (like above).
From what I can tell, I do not have to change the DNS records until we actually start to migrate mailboxes. Would that be correct? I would rather do some additional testing, and get our load balancers configured correctly, before pointing autodiscover and owa at EX2013.
Most of the documentation I have seen says change the DNS records at the end of your installation, but that would be if I was ready to migrate mailboxes I would think.
Thanks for any help or assistance on this. I have read all of the articles on the Exchange Blog site, but nothing really says make this change immediately.