Does Exchange Hybrid Deployment keeps a copy of emails in Exchange Online?

Daniel Sanchez 1 Reputation point

We are a company trying to implement a hybrid solution with Exchange "on-premises" and Microsoft 365.

However, in the guide "Exchange Server hybrid deployments" it says that the Mailbox location after hybrid deployment is "on-premises and in Exchange-online".

Does this mean that Microsoft makes a copy of the emails Online??

We do not wish to have our emails in servers hosted by Microsoft. Is there a way to make this possible?

Microsoft Exchange Hybrid Management
Microsoft Exchange Hybrid Management
Microsoft Exchange: Microsoft messaging and collaboration software.Hybrid Management: Organizing, handling, directing or controlling hybrid deployments.
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  1. Vasil Michev 94,131 Reputation points MVP

    No, that's not what it means. It means that you can have a given mailbox located either on-premises or in the cloud, but not both.

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  2. Joyce Shen - MSFT 16,641 Reputation points

    Hi @Daniel Sanchez

    A hybrid environment allows you keep your mailboxes on-premise or migrate them to cloud, but you cannot have a mailbox located both on-premise and online.

    And the official document introduces this scenario "a mailbox exists in both Exchange Online and on-premises" (which is not the supported way) and the solution to resolve it.

    You could refer to this link to know more about hybrid: Exchange Server hybrid deployments

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