Let's use contesso.com as an example. Let's say the Exchange 2007 server's internal and external name are currently mail.contesso.com. Now I am going to introduce a new Exchange 2013 server named mail2.contesso.com. The Exchange Server Deployment Assistant says that we should make the external DNS entry point mail.contesso.com to the 2013 server and legacy.contesso.com point to the 2007 server. That takes care of external clients. I don't understand how internal clients will find the correct server because they are all configured for mail.contesso.com which internally points to the 2007 server. We have over 200 users with multiple devices. We do not want to be forced to create new Outlook profiles or change the configuration of their mobile devices.
Thanks,
Tina
Tina M. White Boundless Data