Migrate Entra AD Connect

Synopsis: Outlines the steps to migrate Entra AD Sync to a new server.

Published June 7th, 2026
Last Modified: June 7th, 2026

Intro: Here are the somewhat messy notes on migrating Entra AD Sync to a new server. ( Formerly Azure AD Connect.)

Quick Run Down

1.) Export configuration from legacy server

2.) Prep New Server

3.) Install + Import prior config

4.) Remove prior server from O365

5.) Uninstall client from legacy server

Export configuration

Open the Entra AD Sync configuration app on the origin server.
While the application is open, the sync service will be paused.
Chose the export settings option.

Prep New Server

Install Entra AD Client on new Server
Installer is now located behind the O365 login within the admin portal.
https://entra.microsoft.com/#view/Microsoft_AAD_Connect_Provisioning/AADConnectMenuBlade/%7E/GetStarted
Run the installer with the 'custom settings' option. Not Express

Install and Import prior config.

Run the installer with the 'custom settings' option. Not Express
Import the .json file when prompted
Don't need to select 'Staging Mode' as the origin server is still paused from the application being open.

Remove from O365

Log into 365 Admin, navigate to Entra ID
Navigate to Entra Connect Health
Click on "Sync Services" and then click on the Service Name
Confirm the new Domain Controller is listed in Sync Service screen
Click on the older Domain Controller and then click "Delete":

Uninstall prior instance

Close the Entra AD Application
In Add or Remove Programs, select the Entra AD Sync applications and uninstall them from the server