Here is our organisation Exchange server 2013 is installed on Windows server 2012. Everything is working fine. Now my manager wants to change the mail id. Our domain name is ABC.com . So the mail id is currently user@ABC.com. But now they want to change the mail id from user@ABC.com to say firstname.lastname@example.org. They don't want to rename the domain. Only the mail id.
Is their any solution .