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Office 365 with multiple domains in Office 365
Dear community! I am new in Office 365 Exchange implementation. I have my own domain and my own hosting on one server, where I have also my own emails, and I am running there via IMAP. On that m...
Yes it’s called exchange hybrid. You keep mail flowing to existing servers and then a connector basically transfers the office 365 email to the mailboxes there. You can freely move mailboxes back and forth if correctly Setup.
https://docs.microsoft.com/en-us/exchange/exchange-hybrid
https://docs.microsoft.com/en-us/exchange/exchange-hybrid