Migrate on-premise hybrid exchange server 2016 to 2019 office365 mailbox type question

Harry Mace 40 Reputation points

I am planning on migrating our on-premise hybrid exchange 2016 to 2019. We use the on-premise Hybrid server for MFC/scanners devices and to add new mailboxes to exchange online. We have about 1000 users with Mailbox type Office 365 on our on-premise Hybrid exchange EAC. Will I need to move the database that these pointers are stored in?

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  1. Noah Ma-MSFT 2,340 Reputation points Microsoft Vendor

    Hi @Harry Mace ,

    Thank you for posting to Microsoft Community.

    Based on your description, I want to know if you mean there is a concern about the mailbox database when you migrate Exchange 2016 to 2019.

    However, I have the following to share with you. User mailbox means creating mailbox in your local database, the Office 365 mailbox means creating mailbox in O365.

    And you should move the database since you are planning on migrating your Exchange 2016 to 2019.

    You could refer to Manage mailbox databases in Exchange Server | Microsoft Learn for managing the database.

    Also, if there aren't any more mailboxes on the database and mails are running perfectly to O365, you could be ready to delete it.

    Hope it helps, and if there is anything I misunderstood or you need help, please let me know.

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