Ha hybrid módban (van AD sync) tolod, akkor az a vicc, hogy az MS ajánlás szerint meg kell tartanod egy darab Exchange szervert on-premise. Mert ha az utolsót is eltávolítod, akkor olyan objektumok törlődnek, amik kellenének az O365-nek. Hogy ebből ne legyen balhé, állítólag a Microsoft engedélyez egy darab Exchange szervert futtatni üresen on-premise :D
https://practical365.com/exchange-server/how-to-remove-the-last-exchang…
https://techcommunity.microsoft.com/t5/exchange-team-blog/decommissioni…
One of the biggest questions asked after completing an Exchange migration is “How to get rid of the last Exchange Server from your Active Directory?” Currently, you have to keep Exchange Server in your environment because Azure AD Connect (also called DirSync) locks the Source Of Authority (SoA) of the objects to your Active Directory. This means that you’re unable to change user attributes such as proxy addresses in Office 365 Admin Center, however, you still need to be able to manage those attributes in your Active Directory using Exchange Admin Center (EAC) or Exchange Management Shell (EMS) and also synchronize them to Office 365. Moreover, using other tools such as ADSI Edit to manage your users isn’t supported at the moment. The dilemma is currently problematic for Admins and Microsoft doesn’t currently have a solution to this. In this video, I deliberate this issue with my fellow MVPs at the MVP Summit 2019.
Én különválasztottam a francba az AD-tól az egészet, így megtehettem, hogy kidobtam az utolsó Exchange szervert.