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Switch from Exchange Classic Hybrid to Exchange Modern Hybrid Topology

Right now, there is an Exchange Classic Hybrid Topology configured, and we want to configure Exchange Modern Hybrid Topology. In this article, you will learn how to switch from Exchange Classic Hybrid Topology to Exchange Modern Hybrid Topology.

Before you switch to Exchange Modern Hybrid Topology

It’s essential that you first:

  1. Remove existing migration batches
  2. Remove existing migration endpoint

Switch to Exchange Modern Hybrid Topology

Switch from Exchange Classic Hybrid Topology to Exchange Modern Hybrid Topology by following these steps:

Remove previous Hybrid Configuraton Wizard version

Go to Programs and Features in Control Panel and verify that a previous Hybrid Configuration Wizard is not already installed. If it is, uninstall it.

Uninstall Microsoft Office 365 Hybrid Configuration Wizard

Select Remove the application from this computer and click OK.

Remove Microsoft 365 HCW application

Download Hybrid Configuration Wizard

You can run the Hybrid Configuration Wizard from other Windows Servers or a workstation. We recommend to sign in on an Exchange Server and run the HCW directly on the Exchange Server.

Start Internet Explorer and copy-paste the link (Microsoft). If you use other web browsers, it might not work as expected. That’s why we recommend using Internet Explorer.

Note: If you don’t get the HCW install window, read the article Office 365 Hybrid Configuration Wizard can’t start.

Install Hybrid Configuration Wizard

After you download the Hybrid Configuration Wizard setup, click Install.

Install Microsoft Office 365 Hybrid Configuration Wizard

The Microsoft Office 365 Hybrid Configuration Wizard installer is running.

Installing Microsoft 365 Hybrid Configuration Wizard

Run Hybrid Configuration Wizard

After downloading and installing, the first screen of the wizard shows up. Click next.

Hybrid Configuration Wizard

The Hybrid Configuration Wizard will detect the optimal Exchange Server. Click on next.

Detect optimal Exchange Server

Change the on-premises Exchange administrator account credentials if you want. In our example, we will keep the same user that’s logged in. Click sign in and enter the Office 365 Exchange Online Account. Click next.

On-premises Exchange account and Office 365 Exchange Online account

It will gather both accounts’ information and check if it can connect to Exchange on-premises and Exchange Online. Click next.

If it fails, read the article Hybrid Configuration Wizard fails to connect.

HCW gathering configuration information

Choose Full Hybrid Configuration and click next.

Full Hybrid Configuration

Select the domains and click next.

Select Hybrid Domains

Select Use Exchange Modern Hybrid Topology. Click next.

Use Exchange Modern Hybrid Topology

Go to Active Directory Users and Computers. Create a service account svc-hybridmigrations. Make it a member of the group Organization Management.

Create ADUC service account

Exchange Online will use the credentials to connect to your on-premises Exchange Server to move mailbox data to the cloud. It means that it will go to need some special privileges. If you enter your administrator account credentials here, it will work. But it’s a member of the domain admins group and a powerful account for such a task.

Instead, you can create a special service account and add it to the Organization Management group. Fill in the credentials that you created in the above step. Click next.

On-premises account for migration

Sign in to Microsoft Azure with your global administrator account.

Global administrator account

Fill in the global administrator password.

Global administrator account password

The Hybrid Agent setup will start to download, install, register, and validate the Hybrid Agent. Click next.

Hybrid agent setup

Select Configure my Client Access and Mailbox servers for secure mail transport (typical). If you have an Edge Transport server, use the second option. Click next.

Configure Client Access and Mailbox servers for secure mail transport

Choose the Exchange Server(s) for the receive connector. Click next.

Receive connector configuration

Choose the Exchange Server(s) for the send connector. Click next.

Send connector configuration

Select the certificate. Click next.

Transport certificate

Fill in the DNS name that represents your on-premises Exchange Organization for hybrid mail flow. This determines where Exchange Online Protection will connect to in order to route email from the cloud to the on-premises organization. Click next.

Organization FQDN

Click update and wait for the Hybrid Configuration Wizard to run.

Ready for update

Congratulations! The Exchange Hybrid Configuration is a success. The hybrid services are now configured between Exchange Online in the Office 365 tenant and the on-premises Exchange environment. Click close.

Hybrid Configuration Wizard finish

Verify that the Microsoft Hybrid service and Microsoft Office 365 Hybrid Configuration Wizard are installed.

Verify HCW installation

You can always rerun the Hybrid Configuration Wizard whenever you make any changes to the environment or when you want to switch back to Exchange Classic Hybrid Topology.

Read more: Find RemoteHostName URL for mailbox migration »


You learned how to switch from Exchange Classic Hybrid to Exchange Modern Hybrid Topology. Run the Hybrid Configuration Wizard and go through the steps. Once done, you have the Modern Hybrid Topology configured.

Did you enjoy this article? You may also like Configure Hybrid Modern Authentication in Exchange on-premises. Don’t forget to follow us and share this article.



ALI TAJRAN is a passionate IT Architect, IT Consultant, and Microsoft Certified Trainer. He started Information Technology at a very young age, and his goal is to teach and inspire others. Read more »

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