We are in the process of being divested from a large corporation. To get our business unit up-and-running as quickly as possible after the sale, I setup Office 365 and created accounts for all of our employees. We are currently still operating on the ex-parent company's Active Directory, but in the process of setting up our own Active Directory. My plan is to migrate computers, users and groups (using ADMT) from the ex-parent AD to the newly created AD so that I can keep the SID history to continue to allow access to resources that are coming over to our new AD.
QUESTION: Since I will have accounts in my new domain and accounts in my Office 365 tenant that match; how do I get DirSync to start sync'ing password changes between the On-Prem AD and Azure AD? NOTE: I plan to set the UPN of my On-Prem AD to match the Azure AD UPN.
BTW: Our AD will be running Windows Server 2012 R2. If anyone has information about whether we have DirSync or Windows Essentials to handle the integration and synchronization, it would be very much appreciated.