Cross-forest Exchange migration in O365 hybrid environment

fsdg 986 Reputation points
2022-05-11T14:10:38.523+00:00

Hello,

Current environment:
Domain (forest) A
Domain (forest) B

Domain A:
Exchange 2016
AD connect
Hybrid to O365 one tenant
1600 mailboxes onprem(Exchange 2016)
1000 mailboxes O365 tenant

Domain B:
Exchange 2019- 0 mailboxes

We need to plan cross-forest migration to Domain B in this hybrid environment
because Domain A need to be decommissioned.
The same SMTP domain will be kept in the destination environment.
This is tutorial for exchange cross-forest https://community.spiceworks.com/how_to/126929-migrate-users-and-email-to-a-new-ad-domain but I need "how to" for cross-forest in O365 hybrid environment
Any advice,hint,tutorial,how to,documentation... for Exchange O365 hybrid cross-forest migration?
Thank you

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