Decommission Exchange 2010


This tutorial follows Exchange migration to Office 365 – minimum hybrid configuration for uninstalling (decommissioning) of Exchange in the local environment

Microsoft recommends not to decommission the local Exchange, by doing this you can no longer administer with an interface mailboxes including aliases.

This tutorial can also serve as a guide for uninstalling after migrating to a higher version or simply removing Exchange from your environment.


Add the autodiscover record to the domain as defined in the administration interface of your Office 365 account.

Exchange Decommission

Disable Azure AD Connect synchronization

Go to the server where Azure AD Connect is installed and disable synchronization by entering the following powershell command:

Check that the synchronization status by entering the following command:

Vérification de la synchronisation

Saving proxyAddress attributes

Export the proxyAddress attribute using the powershell script available here.

Migrating Public Folders – optional

Check public records are still active by entering the following command:

If you have files, you must migrate them before continuing.

Removal of SCP

The SCP point allows automatic configuration of Outlook clients. Do not execute this command if you are upgrading locally.

Delete the SCP point by entering the following command:

Delete offline address books

You must now delete the offline address book from the management console, go to Organization configuration 1 / Mailboxes 2. Go to the Offline Address Book 3 tab. Select the address book 4 then right click on it and click on Delete 5.

Supression du carnet hors ligne

Confirm the deletion by clicking on Yes 1.


Confirm the deletion again by clicking Yes for all 1.

Confirmer : Oui pour tout

Identify if several address books are present.

Delete public folders

Delete public folders, enter the following powershell command:

Suppression des dossiers publics

Confirm the deletion.

Confirmation de la suppression

Now delete the public folder database.

Return to the management console of Exchange, go to Configuration of the organization 1 / Mailbox 2. Go to the tab Database management 3, select the public folder database 4, right click on it and click on Delete 5.

Decommission exchange : suppression base de données dossier public

Confirm the deletion of the public folder by clicking on Yes 1.


Resolve the error deleting the public folder database.

If the error message below appears, here is how to delete the base.

Erreur suppression dossier public

Go back to database 1 and right click on it and click on Dismount database 2.

Démonter la bdd

Confirm by clicking on Yes 1.


Retrieve the path of the files, right click on the base and Properties and note the Path to the database 1.

Proprietes de la base

Create a new folder and move the contents of the folder to the new one. The source folder must be empty.

Déplacer la base dans le dossier

Return to the interface and mount the database, right click on it and click on Mount database 1.

Remonter la base de données

Confirm the creation by clicking Yes for all 1.

Confirmer la création de la base

Redo a right click on the base and click on Delete 1.

Supprimer la base

Confirm the deletion by clicking on Yes 1.

Confirmer la suppression

Confirm again by clicking Yes for all 1.

Oui pour tout

Click OK 1 on the delete confirmation window.

Résultat de la suppression

Disabling and deleting mailboxes

Disabling mailboxes

We must now deactivate all mailboxes.

From the Exchange console, go to the list of boxes: Configuration of recipient 1 -> Mailbox 2, select all users 3, right click and click on Deactivate 4.

Désactivation des boîtes

Do not click on Delete, this action also deletes the user from the Active Directory.

Confirm deactivation by clicking on Yes 1.

Confirmer la désactivation

Removal of disabled mailboxes

To remove disabled mailboxes, open a PowerShell prompt and enter the commands below:

If during the first command returns the following error s: Error: Pipeline not executed because a pipeline is already executing. This is due to the version of PowerShell which does not support commands with multiple pipes |.

Alternative solution :

Repeat for each database.

Refresh the management console to make sure the mailboxes are deleted.

If mailboxes are still present, enter the command:

Alternative commands:

Repeat for each database if necessary.

Deleting SystemMailbox accounts

On a domain controller and open the Active Directory Users and Computer console, search for accounts containing system 1. Select all SystemMailbox users * 2 then right click and click on delete 3.

Decommission exchange : suppression des utilisateurs SystemMailbox

Remove connectors

Remove the Send connectors using the following PowerShell command:

To delete the reception connectors, return to the management console, go to Server configuration 1 / Transport hub 2. Select the server 3 then the connector 4 and right click on it and click on Delete 5.

Decommission exchange : suppression connecteurs

Repeat for all connectors and servers

Uninstalling Exchange

Open the Control Panel -> Programs and Features, search for Microsoft Exchange Server 20XX and right click on it and click Uninstall 1.


When launching the wizard click on Next> 1.

Confirmation désisntallation

Uncheck roles 1 and click Next> 2.

Décocher les rôles

Once the tests have been validated, click on Uninstall.

Lancer la désisntallation

Click finish to close the wizard, Exchange is uninstalled.

Désinstallation terminée

ProxyAddresses attribute verification

In some cases, uninstalling Exchange empties the users’ proxyAddresses attribute.

From the Active DIrectory Users and Computers console, verify that the proxyAddresses attribute is present and not empty 1.

Vérification attributs

In an AD environment, wait a few hours for replication to take place on all DCs.

If the attribute is empty, use the script to re-inject the email addresses.

Uninstall Microsoft Office 365 Hybrid Configuration Wizard

From the control panel, launch the wizard to remove Microsoft Office 365 Hybrid Configuration Wizard.

Désinstaller HCW

Choose to delete the application from this computer and click OK 1.

Désinstaller HCW

Relaunch Azure Ad Connect synchronization

Once you are sure that everything is good, restart AD Connect synchronization with the following PowerShell command :


During preparation tests for uninstalling Exchange the following errors are possible :


1 : Files are opened by the “SMEX_Master” process () (code: 4068) (Antivirus): I had to deactivate the antivirus.

2 : Error due to arbitration mailboxes, to resolve this error enter the powershell command below.

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