Exchange Server Decommissioning — Safe On-Premises Exchange Removal
Exchange Server Decommissioning is a 3-day implementation service for organizations that have completed their move to Exchange Online and need the last on-premises Microsoft Exchange servers removed cleanly. IT Partner gathers information, backs up Exchange-related data and Active Directory state, uninstalls Exchange using supported procedures, and verifies the environment so the removal does not cause domain operation, Exchange reinstallation, or Active Directory integration issues.
What this engagement is
Retiring the last on-premises Exchange servers is now time-critical for many organizations: Exchange Server 2016 and Exchange Server 2019 reached end of support on October 14, 2025, and the only supported on-premises release is the subscription-based Exchange Server Subscription Edition (SE). If your organization has fully moved to Exchange Online and no longer uses on-premises Exchange for mail flow or any other purpose, this service removes Exchange and its traces from the domain. Incorrect removal can cause problems in further domain operation and can make it impossible to reinstall Exchange or integrate Active Directory with various services, so IT Partner follows a controlled process: information gathering, backup, domain preparation, supported uninstallation, and verification. The plan may vary depending on your needs.
Success criteria
What you receive
How the work unfolds
Confirm the scope, the in-scope Exchange servers, known dependencies, points of contact, and the decommissioning schedule.
Verify prerequisites, check for remaining mailboxes, mail flow, and application dependencies, and prepare Active Directory and the domain for a clean uninstallation.
Back up agreed Exchange-related server data, configuration, and Active Directory state items before any removal begins.
Uninstall and decommission the in-scope Exchange server components using supported procedures where possible.
Validate Exchange removal and Active Directory cleanup, verify that user work is not affected, and fix issues identified within the agreed scope.
Prerequisites
Who does what
IT Partner
- Information gathering
- Data backup
- Correct decommissioning of Microsoft Exchange
Your team
- Coordinate Client resources and staff schedules
- Provide a dedicated point of contact responsible for working with IT Partner
- Review and approve engagement deliverables in a timely manner
- Request and approve all change management tickets (if any) in the Client environment
- Provide access to physical and virtual servers as needed
- Coordinate any outside vendor resources and schedules
- Configure all networking equipment, such as load balancers, routers, firewalls, and switches
What's not included
Limitations & technical notes
Frequently asked questions
What is the Exchange Server Decommissioning service?
Exchange Server Decommissioning is a 3-day implementation service for organizations that have stopped using on-premises Microsoft Exchange and use Exchange Online only. IT Partner gathers information, backs up data, prepares the domain, uninstalls Exchange, and verifies the environment to reduce the risk of domain operation, Exchange reinstallation, or Active Directory integration issues.
Who is this service for?
This service is for organizations that no longer use on-premises Microsoft Exchange for mail flow or any other purpose and want to remove Exchange traces from the domain. It is intended for environments where Exchange Online is the active messaging platform and on-premises Exchange is ready to be decommissioned.
How long does Exchange Server Decommissioning take?
The stated duration for the Exchange Server Decommissioning service is 3 days. The exact plan may vary depending on the customer environment and requirements, so any scheduling assumptions should be confirmed with IT Partner before the engagement begins.
How much does Exchange Server Decommissioning cost?
The service is $3,300 per project, quoted fixed-price in writing before work begins — you pay after you approve delivery. The price covers the stated decommissioning scope; needs outside that scope, such as mailbox migration or remediation of unrelated infrastructure issues, are quoted separately.
What is included in the service?
The service includes information gathering, data backup, preparation of the domain for Exchange uninstallation, correct decommissioning of Microsoft Exchange, and verification and fixing of issues. These activities are aligned to the goal of removing the Exchange server from the organization without disrupting user work.
What are the prerequisites for this service?
The prerequisites are that Microsoft Exchange is correctly installed in the organization and that it is not used for sending or receiving mail or for any other purpose. These prerequisites matter because the service is intended for decommissioning unused on-premises Exchange, not for migrating active mail flow or replacing current Exchange functionality.
Can this service be used if we still send or receive mail through on-premises Exchange?
No, not as stated in the service scope, because a prerequisite is that Microsoft Exchange is not used for sending or receiving mail or for any other purpose. If on-premises Exchange is still involved in mail flow, that dependency should be addressed before scheduling decommissioning.
Does this service include migration to Exchange Online?
No. Mailbox, public folder, archive, and mail flow migration to Exchange Online are explicitly out of scope. The service assumes your migration is already complete and on-premises Exchange is no longer used for any purpose. If you still need to migrate, IT Partner offers separate Exchange Online migration services that can be scheduled before decommissioning.
Will user work be disrupted during the decommissioning?
One of the service success criteria is that user work is not disrupted. This is why IT Partner gathers information, backs up data, prepares the domain, and verifies the environment rather than simply removing Exchange without a controlled process.
What happens to Active Directory during the service?
The service is intended to remove Exchange attributes and data from Active Directory as part of removing Exchange traces from the domain. This is important because incorrect Exchange removal can cause future domain operation issues, Exchange reinstallation problems, or Active Directory integration issues.
Why should Exchange not be removed manually without a decommissioning process?
Incorrect removal of Exchange can lead to problems in further domain operation and can make it impossible to reinstall Exchange or integrate Active Directory with various services. The service follows a controlled process that includes preparation, backup, uninstallation, and verification to reduce those risks.
What is not included in the Exchange Server Decommissioning service?
The service does not include mailbox or public folder migration, hybrid configuration or Microsoft Entra Connect remediation, fixes for unrelated Active Directory, DNS, or network issues, configuration of client-managed networking equipment, disposal of the underlying physical or virtual servers after Exchange is removed, backup platform implementation, remediation of third-party applications or devices that still relay mail through the Exchange server, or after-hours change windows unless separately agreed.