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Hybrid Migration – Migrate Exchange Mailboxes to Office 365

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    Summary: In this post, we’ve discussed the Office 365 Hybrid Migration method to migrate Exchange mailboxes to Microsoft 365. Also, you’ll find the stepwise process to migrate the on-premises Exchange mailboxes to Microsoft 365 and vice-versa by using this method. In addition, we mention about an automated tool that can easily migrate the mailboxes from Exchange to Microsoft 365.

    Nowadays, more and more enterprises are planning to move from an On-Premise messaging environment to Exchange Online (Microsoft 365). There are certain factors that are encouraging them to consider migration to Microsoft 365 such as to enhance management overhead, ensure easy manageability, and reduce capital costs for running the server edition. However, for Exchange administrators, one of the tedious and challenging job requirements is to migrate Exchange mailboxes to Microsoft 365. 

    There are several methods available to cater to the migration process. One of the efficient methods is Microsoft 365 Hybrid Migration. Let’s explore this method in detail.

    Try Stellar Converter for EDB for exporting Exchange Mailboxes to Office 365 without using powershell commands. 

    Office 365 Hybrid Migration: An Overview

    Office 365 Hybrid Migration is the migration process that enables on-premises mailboxes migration to on-site or an approach to ensure Exchange to Office 365 migration to be smooth and seamless to the users. With this approach, an individual can easily transfer the existing mailboxes between Exchange Server and Exchange Online. In this process, an individual does not need to create a new mailbox and import information.

    What are the Benefits of Exchange-based Hybrid Deployment?

    • Freedom to migrate either Exchange Online mailboxes to the Exchange organization or On-Premises Exchange mailboxes to the Exchange Online organization
    • No need to create new user mailboxes and import information
    • Less painful to users
    • Seeding data before the migration

    Hybrid Migration Office 365 Requirement

    As said, the migration process is seamless to the users. But for the admins, there is a considerate amount of work to be done beforehand.

    • Prior to migration, proper permissions are required
    • Make sure that the Hybrid deployment between On-Premises and Exchange Online organizations is configured, and the local Exchange Server is healthy and working properly
    • In On-Premises Exchange 2013 Client Access servers, ensure that the Mailbox Replication Proxy Service is enabled

    Steps for Hybrid Migration Office 365

    The process to migrate Exchange mailboxes from On-Premise to Office 365 or vice-versa is simple and easy. Follow the steps below for a successful migration:

    1. Create Endpoint for Migration
    2. Proxy Service Enabling
    3. Move Mailboxes by using EAC
    4. Batches Removal
    5. OWA Re-enabling for Offline Access

    Now, let’s discuss these steps in detail

    1. Create Endpoint for Migration

    The first and foremost step, before executing remote move migrations – both On-Boarding and Off-Boarding, is to create Exchange migration endpoint. This endpoint includes connection setting for on-premises Exchange server, which runs the MRS proxy. This service helps in executing remote migrations to and from Exchange online.

    Migration Endpoint
    Select the migration endpoint type

    2. Proxy Service Enabling

    In case, the MRS Proxy is not enabled on the On-Premises Exchange 2013 Client Access servers, you need to enable it.

    The steps to enable Proxy Service are as follows:

    • Go to EAC and open it
    • Now, navigate to the Servers
    • Select Virtual Directories
    • Choose Client Access Server
    • Select the EWS virtual directory
    • Click on the Edit option
    Exchange Admin Center
    • Now, check the MRS Proxy enabled checkbox
    MRS Proxy enabled
    • Click on Save option
    • Click OK

    3. Move Mailboxes by Using EAC

    In the Exchange Admin Center (EAC) on the Office 365 tab, there is a remote migration wizard. You can use this wizard to migrate Exchange Online mailboxes to the On-premises organization or to move the On-premises user mailboxes to the Exchange Online organization. You can select any of these procedures.

    Migrate On-Premises Mailboxes to Office 365

    Steps are as follows:

    • Go to EAC and open it
    • Now, navigate to Office 365
    Navigate to Office 365
    • Click on the Recipients
    • Select the Migration option
    • Click on the Add option
    • Select Migrate to Exchange Online
    • Now, from Select a Migration Type window, choose Remote Move Migration
    New Migration Batch
    • Click Next
    • Under the Select the users’ window, click on the Add + option
    • Choose the On-Premises User
    • Click Add
    • Click OK and Next
    • Now, under Enter the Windows user account credential window, add credentials of on-premises administrator account
    • Click Next
    • Now, under Confirm the migration endpoint window, check whether the FQDN of desired on-premises Exchange server is listed
    • Under Move Configuration window, in the New migration batch name text field, enter the migration batch name
    • Next, choose the Target delivery domain for the mailboxes that you want to migrate to Office 365
    • Next, ensure whether Move primary mailbox along with archive mailbox option is selected or not
    Move primary mailbox along with archive mailbox option
    • Go to Start the Batch option
    • Choose one Recipient
    • Make sure Automatically start the batch option is selected
    • Click on the checkbox of Automatically complete the migration batch
    • Click New

    Migrate Office 365 Mailboxes to On-Premises

    Steps are as follows:

    • Open the EAC
    • Navigate to Office 365
    • Click on the Recipients
    • Click on the Migration
    • Click Add
    • Choose, Migrate from Exchange Online
    Migrate from Exchange Online
    • Under the Select the user window, choose the Select the users that you want to move option
    • Click Next
    • Click on the Add + icon
    • Choose Exchange Online users that you want to migrate to the on-premises organization
    • Click Next
    • Under the Confirm the migration endpoint window, check the listing to ensure FQDN of your on-premises Exchange server is listed
    Confirm the migration endpoint window
    • Click Next
    • Go to Move Configuration window
    • Under the New migration batch name text field, enter migration batch name
    • Under the Target delivery domain for the mailboxes, enter target delivery domain
    • Now, go to Start the batch page
    • Choose one recipient for receiving batch complete report
    • Ensure Automatically start the batch option is selected
    • Next, check the box for Automatically complete the migration batch

    4. Batches Removal

    Once the process to move the mailboxes has been completed, the next important step is batches removal. The reason for this removal is to reduce errors possibilities in scenarios where same users are moved again. Steps are as follows:

    • Open the EAC
    • Navigate to Office 365
    • Select Recipients
    • Select Migration and click on Completed Migration Batch
    • Click on Delete option
    • Confirm it by clicking on Yes

    5. OWA Re-enabling for Offline Access

    Offline access in Outlook on the Web allows you to access mailboxes easily, even in the scenarios when they are not connected to a network. In circumstances, when you are migrating Exchange mailboxes to Exchange Online, you must reset offline access setting in the browser to use Outlook on the web offline.

    Limitations of the Office 365 Hybrid Migration Method

    With this manual method, you can migrate mailboxes to Microsoft 365. But like other manual methods, there are some limitations, associated with Hybrid Migration method:

    • Lengthy process
    • Involves manual intervention and skilled admins to configure a healthy hybrid system

    Manual method: https://docs.microsoft.com/en-us/exchange/mailbox-migration/use-minimal-hybrid-to-quickly-migrate

    Alternate Method

    To overcome these limitations, the best solution is to use a reliable and secure third-party tool such as Stellar Converter for EDB. This tool is fully automated and is easy, fast, and efficient.

    It is an excellent utility designed to exports exchange mailboxes to directly Microsoft 365. With this powerful software, you can quickly convert Online as well as Offline Exchange EDB files into PST Files.. Using this software, you can quickly and seamlessly extract Exchange mailbox data such as attachments, contacts, emails, notes, calendars, tasks, to do list, etc. Thanks to its simple and intuitive GUI, you can easily execute the conversion process. 

    Check Out: Following Steps to migrate Exchange Mailboxes to Office 365 with the help of Stellar Converter for EDB.

    Key Features of Stellar Converter for EDB

    • Secure and user-friendly
    • Archive mailboxes conversion support
    • Allows conversion of multiple EDB files
    • Supports offline EDB data to live Exchange Mailbox of any version
    • Offers added support to save converted mailbox to Microsoft 365
    • Facilitates specific mails searching from the converted file
    • Facilitates selective user mailboxes conversion to PST file
    • Offers option to salvage converted data in different formats such as HTML, RTF, and PDF formats
    • Offers preview support for mailboxes and mailbox items such as emails, notes, contacts, calendar, sent items, attachments, etc.


    The application can be installed on Windows 10, Windows 8, Windows 7, Windows Vista, Windows Server 2016, Windows Server 2012 and R2, and Windows Server 2008 R2.


    The application can open any EDB format from Exchange Server 2019, 2016, 2013, 2010, 2007, 2003, 2000 and 5.5.

    The Way Forward

    Office 365 Hybrid Migration is one of the well-known processes aimed at facilitating Exchange to Office 365 migration or vice-versa. However, it is bit lengthy, complicated, and, above all, requires technical knowledge. Therefore, all those who wish for an easy, simple, fast, and reliable solution for migration, Stellar Converter for EDB is an ideal choice.

    Some other important resources:

    Cutover Migration

    Staged Migration

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    About The Author

    Eric Simson linkdin

    Eric Simson is an Email Platform Consultant and is associated with Stellar Data Recovery from last 6 years. He writes about the latest technology tips and provides custom solutions related to MS Outlook, MS Exchange Server, Office 365, and many other Email Clients & Servers.


    1. Thanks, but you do not mention the prerequisite of this migration such as Microsoft Azure subscription and Azure AD connect. Hybrid Migration won’t be taking place unless Azure AD connect is set properly.

      Thank you.

      1. Thanks for sharing your suggestion!

        I will start to work on your suggestion as soon as possible.

    2. Hi
      I have exchange 2010 and exchange 2016 co-existence and is set to a hybrid configuration with exchange online. I setup endpoint and moved archive mailbox to exchange online successfully, but after moving I can see the archive mailbox in OWA but not in Outlook.

      Any idea?

      1. YES!

        You can migrate existing mailboxes from Exchange server to Exchange Online safely using Stellar EDB to PST Conversion.

      1. Hello Bob,

        In hybrid migration, Administrator should configure a hybrid deployment between on-premises and Exchange Online (Office 365).

        Later, we will work as mentioned in the above tutorial. But, the safety of data is a critical point for every administrator.

        1. Yes Eric,

          Our pharma company doesn’t like any mess with distributor’s data. Right now, we have 2456+ distributor across the north and south American cities.

          We just need a simple solution.

        2. Hi Wesley,

          For migrating Exchange mailboxes to Office 365 platform, try free demo of Stellar Converter for EDB.

          If it works according to your customise corporate requirement, then you can register the license version of the software.

    3. Hi Erick,

      After moving Mailboxes through Exchange Admin Centre (EAC), it shows ‘complete’ status but the actual result summary is mentioned below:


      How can I fix the failure attempt?

      1. Hello Muhammad,

        This error can happen if a previous mailbox migration process had failed. You should delete the batch of failed migration before re-attempting. After this, you will gain permission to move mailbox successfully.

    4. Hybrid Migration is a big assignment for Network Administrators. Right now, I have only six months experience in data centre and cloud migration. So, I will prefer Stellar Converter for EDB.

    5. Yesterday, I faced similar problem i.e. “CommunicationErrorTransientException”. Please elaborate the process to reset maximum HTTP Requests manually.

    6. I got an error while moving a mailbox from an on-premises Exchange environment to Office 365.
      Please share a suitable method to fix this issue efficiently.

      1. Are you receiving the error message i.e. Transient error CommunicationErrorTransientException has occurred? If yes, then HTTP requests from servers have been blocked by Microsoft Threat Management Gateway (TMG). To resolve this problem, you should set maximum HTTP Requests per minute/IP address.

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