AD Migration https://learn.microsoft.com/en-us/training/modules/active-directory-domain-services-migration/1-introduction https://learn.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2008-R2-and-2008/cc974332(v=ws.10)?redirectedfrom=MSDN https://learn.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2008-r2-and-2008/cc974352(v=ws.10)