Microsoft Exchange/Office365

How to remove Exchange Server from Active Directory

This article describes how remove Exchange Server from your computer, from the Site; and from Active Directory as well.

Here are some possible reasons.
1. Happens when Exchange server is not properflz uninstalled and left some traces (attributes) in Active Directory
2. When it is permanently offline and Exchange should be removed.

Before you remove Exchange Server, regardless the version you are running, you must disconnect all mailbox-enabled users from the mailboxes running Exchange. Exchange Server cannot be removed when its mailboxes are still mounted.

Method 1. Remove (legacy) Exchange server using ADSIEdit
The method of employing ADSIEdit to remove an Exchange server should be done carefully.

To remove the server open ADSI-Edit and go to configuration, navigate to this path:

CN=Configuration,DC=DOMAIN,DC=LOCAL
CN=Services
CN=Microsoft Exchange
CN=EXCHANGE_ORG
CN=Administrative Groups

Method 2. How to remove a dead Exchange server from Active Directory

Connect to the domain controller, launch the run dialog (Windows Key + R)
Type in the command “adsiedit.msc” and then press “OK”
Right click on the console then “Connect to:”
In the connection dialog select “Well known Naming Context”
In the drop down menu select “Configuration”
Explode “CN=Configuration [domain]CN=ServicesCN=Microsoft ExchangeCN=[organization]CN=Administrative GroupsCN=Servers”
Right click on the dead server and pick “Delete”

We also need to delete Database information as well,
navigate to “CN=Configuration [domain]CN=ServicesCN=Microsoft ExchangeCN=[organization]CN=Administrative GroupsCN=Databases”
Explode each items to find which one is related to the old server, then delete it as well.

Additional steps are as follows

1. Delete Exchange Server installation folder on the servers hard disk.
Usually  this is located on drive C:Program FilesMicrosoftExchange Server

2. Also delete the Exchange Back End and Front End websites with the IIS-Manager

3. Delete the Active Directory Users and Computers  in the following container container
DiscoverySearch Mailbox{GUID}
Exchange Online-ApplicationAccount
FederatedEmail.GUID
Migration.GUID
SystemMailbox{GUID}
HealthMailboxGUID

4. Also delete the Registry  key “ExchangeServer” under:HKLMSoftwareMicrosoft and

5. Delete the keys “MSExchange*” under: HKLMCurrentControlSetServices

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