Forum Discussion
Single on-prem AD forest Exchange migration to Multiple Office 365 tenants
Hi Community, One of our customer has about 12 Exchange servers in single AD forest with 10,000 mailboxes. They've multiple organizations segregated by Organization Units (OUs), Let's Say th...
Before having Hybrid Exchange, you need to setup a Hybrid Identity solution (AD Connect). You can only configure one Azure AD tenant in an Exchange Hybrid scenario by the limitation of AD Connect.
PST migration to the different tenants can be done but be aware that there are some limitations and not the most user-friendly migration. There are some third-party solutions to make it easier.
Microsoft's way:
https://docs.microsoft.com/en-us/microsoft-365/compliance/importing-pst-files-to-office-365?view=o365-worldwide