IMAP Migration to Exchange Online

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IMAP Migration to Exchange Online

This document explains the step-by-step process to migrate mailboxes from a remote IMAP server to Exchange Online using the Exchange Admin Center.

Prerequisites

  • Admin access to the Microsoft 365 tenant.
  • IMAP server credentials and server details.
  • A properly formatted CSV file with user mappings.

Migration Procedure

1. Log In to the Exchange Admin Center

2. Start a New Migration Batch

  • From the Exchange Admin Center, select Migration.
  • Click Add migration batch to create a new migration.

3. Configure Batch Settings

  • Enter a unique Name for the migration batch.
  • From the dropdown menu, select Migration to Exchange Online.
  • Click Next.

4. Select Migration Type

  • On the next screen, select IMAP migration.
  • Click Next.

5. Review IMAP Migration Prerequisites

  • Carefully read the prerequisites and notes displayed.
  • Click Next to continue.

6. Set the Migration Endpoint

  • Under Set migration endpoint, click Create a new migration endpoint.
  • Click Next.

7. Configure the Migration Endpoint

  • Enter a Name for the endpoint to identify it.
  • Adjust the following settings as required:
    • Maximum concurrent migrations
    • Maximum concurrent incremental syncs
  • Click Next.

8. Enter IMAP Server Details

  • Enter the FQDN or IP address of the remote IMAP server.
  • Select the following options:
    • Authentication method: Basic
    • Encryption: SSL
    • Port: 993
  • Click Next.

9. Verify Endpoint Setup

  • If the endpoint setup status shows Successful, click Next to proceed.

10. Upload the CSV File with User Mappings

  • Download a sample CSV template by clicking Download a CSV file with headers and sample user information.
  • Populate the CSV with:
    • Target (Microsoft 365) email addresses.
    • Source email addresses.
    • Source passwords.
  • Upload the completed CSV file using the Import CSV file option.
  • Click Next.

11. Select Configuration Settings

  • In the Select configuration settings menu:
    • Leave all options unselected if you wish to migrate the entire mailbox.
  • Click Next.

12. Schedule the Migration Batch

  • Provide the email address where you want to receive migration status notifications.
  • Select your preferred option for Start the migration batch by (either automatically or manually).
  • Click Save.

13. Complete the Migration Batch Creation

  • Once the batch creation completes successfully, a confirmation message will appear.
  • Click Done to finish the process.

Notes

  • You can monitor the migration progress from the Migration dashboard in the Exchange Admin Center.
  • After migration completes, verify mailbox content and cut over DNS (MX) records if applicable.


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