Hybrid Migration – Migrate Exchange Mailboxes to Office 365

Summary: In this post, we’ve discussed the Office 365 Hybrid Migration method to migrate Exchange mailboxes to Office 365. Also, you’ll find the stepwise process to migrate the on-premises Exchange mailboxes to Office 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 Office 365.

Nowadays, more and more enterprises are planning to move from an On-Premise messaging environment to Exchange Online (Office 365). There are certain factors that are encouraging them to consider migration to Office 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 Office 365. 

There are several methods available to cater to the migration process. One of the efficient methods is Office 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.

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

– Now, check the MRS Proxy enabled checkbox

  • 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
  • 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
  • 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
  • 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
  • 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
  • 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 Office 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 Office 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 Office 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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