We have a root domain with two child domains (all in the same forest). ADSync is setup to sync our AD users to Office 365 for all three domains (One ADSync server in root domain that syncs users from all three domains).
We have several users in the root domain that need to be moved to the child domain. Because all our domains are server 2012 functional level, we cant move users to a child domain (ADMT is not supported on server 2012) so we are thinking we could just delete the users from the root domain and create a new account for them in the child domain. Unfortunately, I fear this is going to break the accounts link to Office 365 so when the new user account is setup it will get a new mailbox in Office 365. We need to figure out a way to move these users to a child domain in a way that allows them to keep their Office 365 mailbox. Any ideas?