Forum Discussion
Office 365 - Tenant sync and mailbox migration
Could anyone confirm the following is possible and supported? Exchange 2010 (and AD environment, of course) synced to O365 tenant. Migration of all mailboxes into the cloud and then completely cu...
Below article should help answer your question about having sync performed from different on-premises AD, you can look for the right scenario that matches your topology
https://docs.microsoft.com/en-us/azure/active-directory/hybrid/plan-connect-topologies
And I am not sure about your reason for syncing with new on-premises AD, but you can always leave the accounts as cloud only accounts.