So I've inherited an Azure setup from a previous IT team who was totally incompetent (Really, you can't imagine). They setup Azure with one of the corporate domains (let's call it stupid-name.com). Unfortunately, we actually use a different domain for pretty
much everything else (reallystupid.com). Even better, the office Active Directory forest is a subdomain (corp.reallystupid.com) of that one.
Currently in Azure: stupid-name.com, with all our users and 4 years of Onedrive data. They did an initial sync to get all the usernames in, but it does NOT sync with the office AD domain, and has not for the last 4 years. Usernames and Passwords are manually
managed by me. The usernames directly match the local AD usernames, the passwords do not.
Our email domain (hosted elsewhere): reallystupid.com
Our office AD domain (Onsite Domain Controllers): corp.reallystupid.com
Just to make it even more idiotic, they created the initial Azure account with an @reallystupid.com address, so Azure has reallystupid.onmicrosoft.com while we're using @stupid-name.com to login.
What do I want? To use ADSync to get us to using @reallystupid.com for a login with the usernames and passwords from our corp.reallystupid.com. It's vitally important that I do not overwrite the passwords on the stupid-name.com login until I'm ready. I'd
like to do the configuration, sync, testing, then flip a switch and have everybody's password suddenly switch to the @reallystupid.com login name and corp.reallystupid.com password.
I should mention that I'm a Unix/Networking guy, but I can do basic-to-moderate Active Directory stuff.
Help? Please? :)
-steve