Email IMAP migration to on-premises Exchange server

John Adegbite 0 Reputation points
2026-01-13T10:10:33.6533333+00:00

How can i migrate emails from an IMAP server to Exchange on-premises mailboxes without using a third party tool.

Exchange | Exchange Server | Other
Exchange | Exchange Server | Other

A robust email, calendaring, and collaboration platform developed by Microsoft, designed for enterprise-level communication and data management.Miscellaneous topics that do not fit into specific categories.

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  1. Hin-V 16,830 Reputation points Microsoft External Staff Moderator
    2026-01-13T11:39:34.4766667+00:00

    Hi @John Adegbite

    Thank you for posting your question in Microsoft Q&A. 

    I understand you are looking to migrate email from an IMAP server to Exchange on‑premises mailboxes without using any third‑party tools. 

    Currently, I have not found any official Microsoft guidance for migrating directly from IMAP to Exchange on‑premises yet. However, if you have Exchange Online, a supported approach is to migrate IMAP mailboxes into Exchange Online first, then move them to on‑premises via hybrid mailbox moves. 

    May I confirm whether your environment is hybrid or on‑premises only? 

    If yes, you could perform an IMAP migration to Exchange Online (using an IMAP migration batch), and once the data is in Exchange Online, complete a remote move (offboarding) of the mailboxes to Exchange on‑premises via the mailbox replication service (MRS). 

    I hope this helps. 

    Please feel free to correct me if I misunderstood your request. If you have any additional concerns, feel free to comment below. I would be more than happy to assist. 

    Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread. 

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  2. AI answer

    2026-01-13T10:10:47.2566667+00:00

    To migrate emails from an IMAP server to on-premises Exchange mailboxes without using a third-party tool, you can follow the IMAP migration process provided by Microsoft. Here are the general steps:

    1. Prepare Your Environment: Ensure that IMAP access is enabled on your source IMAP server. For example, if you are using Google Apps, you must enable IMAP access for your organization and check individual user settings.
    2. Create a CSV File: Prepare a CSV file that contains the email addresses of the users whose mailboxes you want to migrate. The header of the CSV file should be labeled as EmailAddress.
    3. Use Exchange Admin Center: In the Exchange Admin Center (EAC) of your on-premises Exchange server, navigate to the migration section and create a new migration batch. Select the option for IMAP migration.
    4. Specify Migration Settings: During the migration batch creation, specify the IMAP server details, including the server name and port, as well as the credentials for an account that has access to the mailboxes on the IMAP server.
    5. Start the Migration: Once the migration batch is created, you can start the migration process. Monitor the migration status to ensure that all emails are successfully migrated to the on-premises Exchange mailboxes.
    6. Post-Migration Tasks: After the migration is complete, verify that all emails have been migrated correctly and inform users to check their new mailboxes.

    This process allows you to migrate emails using native tools provided by Microsoft without the need for third-party applications.

    References:

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