Domain (forest) A
Domain (forest) B
Hybrid to O365 one tenant
1600 mailboxes onprem(Exchange 2016)
1000 mailboxes O365 tenant
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?