I've been given the task of listing down important activities with their estimated effort to help choose the best option/solution for the following scenario:
The current domain is named "Domain0" and users have logins like name@domain0.com
New users should have logins like name@domain.com and need to access the same resources in "Domain0".
In such a case, should a domain be renamed, migrated to a new one or redirected from "Domain0" to "Domain" (if that even makes sense). In the end, all that worked with "Domain0" should work with "Domain" so that "Domain0" can be completely deleted.
P.S. I'm a complete layman in this area, please excuse if you find this question absurd