Exchange Server Roadmap Update
Published Jun 02 2022 10:01 AM 244K Views

Update 5/8/2024: We have released a more updated Roadmap Update covering the future on-premises releases of Exchange Server.

In September 2020, we announced that the next version of Exchange Server would be available in the second half of 2021 via a subscription model and that it would include support, product updates, security updates, and time zone updates. Unfortunately, 2021 had other plans for Exchange Server. In March 2021, we confronted a serious reality: state sponsored threat actors were targeting on-premises Exchange servers.

We quickly responded to protect our customers, releasing out-of-band security updates, along with a one-click mitigation tool that later became part of Exchange Server as the Emergency Mitigation Service. We added AMSI integration in the June 2021 Cumulative Update (CU), enabled the Hybrid Management PowerShell module to work with MFA-enabled admin accounts, and released Security Updates (SUs) in April, May, July, October, and November of 2021, and in January, March and May of this year. We also updated our SU packaging to make installing SUs easier.

We strongly believe that close partnerships with security researchers help make customers more secure, so we also launched a security vulnerability bounty program for Exchange Server and other Office Server products via the Microsoft Applications and On-Premises Servers Bounty Program. Individuals across the globe can now receive monetary rewards for submitting security vulnerabilities found in Exchange Server, as detailed on the program web site.

While we continue to focus on security, we are now also ready to share our long-term roadmap for Exchange Server.

Roadmap Update

We have made changes to our Exchange Server roadmap since our September 2020 announcement, and today we’re excited to share those updates with you. We know that customers and partners have reasons to run Exchange Server, and we are committed to supporting them.

We have moved the release date for the next version of Exchange Server to the second half of 2025. The next version will require Server and CAL licenses and will be accessible only to customers with Software Assurance, similar to the SharePoint Server and Project Server Subscription Editions. We will provide more details on naming, features, requirements, and pricing in the first half of 2024.

We will maintain the current support dates for Exchange Server 2013, Exchange Server 2016, and Exchange Server 2019; however, we plan to support the next version of Exchange Server beyond October 14, 2025. We are moving the next version of Exchange Server to our Modern Lifecycle Policy, which has no end of support dates. We plan on continuing to support Exchange Server as long as there is substantive market demand.

Two of the main challenges in previous versions of Exchange Server with respect to upgrading to the next version are that (1) the next version has historically had greater hardware requirements than the previous version, and (2) customers always had to move mailboxes from the old version to the new version. We are addressing these challenges in the next version by introducing the ability to do an in-place upgrade from Exchange Server 2019. This means that you may not have to acquire new hardware or move mailboxes, and that upgrading to the next version will—by design—be much easier than previous upgrades.

Our guidance for all Exchange Server customers is to make the move to Exchange Server 2019 as soon as possible. If you already run Exchange Server 2019, our guidance is to always keep your servers up-to-date. Exchange Server 2019 includes several features not available in previous versions, including a new and improved Outlook on the web, improved security, better performance and scalability, a modern architecture, integration with SharePoint Server and OneDrive, and new and updated message policy and compliance features.

With our H1 2022 CU release, we added some new features to Exchange Server 2019 (including one that might allow you to shut down your last Exchange server), we added the hybrid server license at no additional charge, and we’re adding even more features, as detailed below.

Investments in Exchange Server 2019

A key element of the Exchange Server roadmap is our investment plans for Exchange Server 2019, which we are excited to share with you today. Over the coming months and years, we will be adding features to Exchange Server 2019, and we’ll continue to support regulatory and data privacy requirements. Our continued investment in Exchange Server 2019 allows us to deliver improved security, deployment and management capabilities, and reliability—the attributes our customers tell us they need most from Exchange Server.

Security Investments

Exchange servers often contain the most sensitive company data, and they host the company address book, which is why it is critical to protect these servers and this data. So, we’re continuing to focus on Exchange Server security, and we’re making several security-related investments.

Modern Authentication Update

Historically, Exchange Server has used Basic authentication (also known as legacy authentication) for client/server and server/server connections. Basic authentication is an outdated industry standard, and it is imperative for organizations to transition away from it as quickly as possible, to reduce attack surfaces and needless risk.

We have been working to deprecate Basic authentication in Exchange Online, and to transition users to something more secure: OAuth 2.0-based authentication, or what we call Modern authentication. OAuth 2.0 is the industry-standard protocol for authorization.

In about 120 days, on Oct 1, 2022, we’re going to start turning off Basic authentication for specific protocols in Exchange Online for those customers still using it. If you are an Exchange Online or Exchange hybrid customer, be sure to read our latest announcement to learn what you need to do to prepare for this change.

Modern authentication enables stronger authentication features, like multi-factor authentication (MFA), smart cards, certificate-based authentication, and third-party security identity providers. Among the many benefits and improvements in modern authentication is that it helps mitigate the security issues with Basic authentication. For example, enabling Modern authentication is an important step toward protecting your organization from brute force and password spray attacks.

We’ve also enabled Modern authentication for all Exchange Server customers in hybrid environments:

  • In September 2017, we shared our roadmap for adding Hybrid Modern Authentication (HMA) support to Exchange Server.
  • In December 2017, we announced the availability of HMA for Exchange Server 2013 and Exchange Server 2016 hybrid deployments.
  • In February 2019, we released Exchange Server 2019 CU1, which added support for HMA.
  • In October 2020, we added support for Modern authentication to the Microsoft Remote Connectivity Analyzer.
  • In May 2022, we announced that our public folder migration scripts now support Modern authentication.

In June 2019, we said that we would not be adding support for Modern authentication to pure on-premises Exchange environments, and that HMA would be our only solution for Exchange Server customers.

Today, we want to provide you with an update on that. We know the HMA requirement for cloud-based authentication in on-premises environments places a burden on some customers, and simply isn’t possible for others.

So, we are excited to announce that, in a reversal of our June 2019 announcement, we are working to add Modern authentication to pure on-premises Exchange Server environments (e.g., no cloud or hybrid). We expect to share our timeline for Modern auth support for each Outlook client later this year.

Support for TLS 1.3

We recently introduced support for Exchange Server 2019 on Windows Server 2022. By default, Windows Server 2022 uses Transport Layer Security (TLS) 1.3, which encrypts data to provide a secure communication channel between two endpoints. TLS 1.3 eliminates obsolete cryptographic algorithms, enhances security over older versions, and aims to encrypt as much of the handshake as possible.

While Exchange Server 2019 supports Windows Server 2022, we’re still working on adding support for TLS 1.3. We expect to support TLS 1.3 in Exchange Server 2019 next year.

Software Update Dashboards for Exchange Online and Exchange Server

Keeping Exchange Server current is a critical security practice, so we’re also making investments to help you stay current with the latest updates for Exchange Server.

Later this year we are introducing a new experience in the Microsoft 365 admin center for viewing the update status of Exchange servers in hybrid environments. This new experience is designed to show admins which Exchange servers need updates, and which servers are approaching or at the end of support.


This experience provides a view of on-premises Exchange servers that is curated using data from multiple sources, such as data customers opt-in to sending to us, data in the Microsoft Online Services processing logs, and publicly available data, such as DNS records.

A similar experience is expected to be added to Exchange Server 2019 early next year.

Exchange Emergency Mitigation Service Rollback

The Exchange Emergency Mitigation Service (EEMS) we added to Exchange Server last year helps keep your servers secure by applying mitigations from Microsoft to address any potential threats against your servers. EEMS is a built-in version of the EOMT that provides protection against security threats that have known mitigations.

After a mitigation applied by EEMS is no longer required, an admin can manually roll back that mitigation. To simplify the process, we’re developing a PowerShell script that admins will be able to use to remove any mitigations that are no longer needed. We expect to release the script next year.

Deployment and Manageability Investments

We know that Exchange Server updates can be complex to deploy for some customers, especially in environments without dedicated Exchange admins or IT staff. We are working to ease these challenges by enhancing Setup to preserve custom config settings, and we’re continuing to work to improve the Hybrid experience by addressing common customer pain points.

Custom Configuration Preservation

We understand that it’s very common for admins to customize their Exchange server settings after Setup has successfully completed. For example, admins often configure client-specific message size limits. These customizations are made in web.config, sharedweb.config, and other files on the Exchange server. One of the challenges for admins is that each time a CU is installed, their customizations are overwritten by Setup. Today, admins need to backup these files and restore them after each CU.

To address this issue, we’re working on changing Setup to preserve these customizations after a CU is installed. We hope to release these changes in the H2 2022 CU or the H1 2023 CU.

Hybrid Experience Improvements

To help admins manage hybrid environments, we’re making even more changes to the Hybrid Configuration Wizard (HCW). Today, the HCW performs several tasks, including configuring the Federation Trust, updating connectors and email address policies, and configuring endpoints and OAuth between on-premises and Exchange Online. After the wizard has completed its tasks, admins often customize the environment.

During a re-run of the HCW, most of the first-time configuration tasks are not required. But since the HCW doesn’t allow skipping steps, custom configurations made after the first HCW run can be lost, possibly leading to a bad hybrid state.

To address this issue, we’re modifying the HCW to allow an admin to choose the steps to perform and skip unnecessary ones. We expect to release an updated HCW with these changes later this year.

MEC is Back!

Today, we are also very excited to announce the Microsoft Exchange Community (MEC) Virtual Airlift, which will take place Sept 13-14, 2022!

MEC features experts from Microsoft and the Exchange community talking about Exchange Online, Exchange Hybrid, and Exchange Server. This is a free technical airlift for IT pros that work with Exchange day-to-day, and developers who create solutions that integrate with Exchange.

You can find out more about MEC at MEC is Back!

Feedback Forums for Exchange Server and Exchange Online

Your feedback matters to Microsoft, and we have a lot of ways for you to share it with us. In the past, Exchange customers and partners used a platform called UserVoice for community driven feedback, but we moved off that platform last year.

Last year we also announced the Microsoft Feedback Portal, which provides a new community feedback experience from Microsoft. Built on Dynamics 365 Customer Service, Feedback is where users can go to provide feedback on popular Microsoft apps and services in one place.

Today, we’re excited to announce the availability of two new Feedback forums for Exchange:

We’re always striving to better serve our customers and partners. You can directly influence change at Microsoft by sharing your feedback. We look forward to hearing from you.

Exchange Server Technology Adoption Program Open Enrollment

Today, we’re also announcing open enrollment for the Exchange Server 2019 Technology Adoption Program (TAP) for customers and partners! The TAP is designed to validate Exchange Server updates by having customers and partners test deployments of pre-release builds of Exchange Server in lab, production, and development environments.

If you are interested in early (pre-release) access to Exchange Server 2019 builds, we invite you to join our TAP. You can find out how to sign up at Exchange TAP Announcement.

Call to Action for Exchange Server Customers

For many organizations, Exchange Online in Microsoft 365 delivers the best productivity, the best security and compliance features and is the most cost-effective solution and best experience. If you are an Exchange Server customer that wants to move to Exchange Online, contact your Microsoft account team today to take advantage of available offers, get help from FastTrack, and receive end-to-end guidance from Microsoft.

As we said earlier, we know that customers have reasons to run Exchange Server, and we are committed to supporting them.

Our guidance for customers who run Exchange Server is to move to Exchange Server 2019 now.

Exchange Server 2019 already includes several features not available in previous versions, including:

  • Support for Windows Server 2022 and Windows Server Core
  • Client/server connections use TLS 1.2 by default
  • New search infrastructure based on Exchange Online
  • Modern hardware support
  • Improvements in calendaring, client experience, compliance (in-place archiving, retention, eDiscovery), data loss prevention, and performance and scalability
  • Exchange Management Tools update that eliminates the need for Exchange Servers used only for recipient management purposes
  • The latest hybrid experience updates, including support for using MFA-enabled admin credentials with Hybrid Agent cmdlets

Soon, Exchange Server 2019 will include support for TLS 1.3, Modern authentication, and more, and it will provide the smoothest and easiest path to the next version of Exchange Server in 2025.

Upgrading to Exchange Server 2019

You can use the Exchange Deployment Assistant (EDA) at to upgrade from Exchange Server 2013 and/or Exchange Server 2016 to Exchange Server 2019. The EDA is a web-based tool that asks you a few questions about your current environment and then generates a custom step-by-step checklist that will help you deploy Exchange Server 2019, the smoothest and quickest path to the future.


Before you deploy Exchange 2019 in your organization, you need to do some careful planning, so be sure to carefully review the information provided by the EDA.

If you are planning an Exchange hybrid environment, be sure to review Exchange Server hybrid deployments and the accompanying information.

Scott Schnoll
Senior Product Marketing Manager
Exchange Online / Exchange Server

Version history
Last update:
‎May 08 2024 05:52 AM
Updated by: