May 23, 2024


Simply Consistent

The Last Exchange Server

In the announcement that was component of the launch of the most the latest set of Cumulative Updates for Trade Server 2019 and 2016, Microsoft launched some adjustments – capabilities if you will – which were acquired with enthusiasm. An overview of these modifications was provided in a recent ENow website write-up: “Trade Cumulative Updates – April 2022”. Nevertheless, I want choose the dialogue further and zoom in on a person of people options, which also comes about to be a well-liked matter for shoppers jogging Trade Hybrid deployments: The Past Exchange Server.

Up to Exchange 2019 CU12 (2022 H1), shoppers that migrated to Trade On the web ended up even now required to go away Trade-connected components jogging on-premises. Even currently, with all the information released around this topic, I am amazed this however stunned customers. This Exchange server operating on-premises is to be utilized for taking care of recipients which have their resource of authority in Energetic Directory, leveraging Energetic Listing Hook up to propagate objects to Azure Lively Directory and as a result Trade On-line. Also, when there is a want to relay messages from applications or multi-functionals, prospects frequently require to have an Trade server on-premises to take these messages, as Trade is the only supported mail relay item for hybrid deployments.

Recipient Management

But with the release of Exchange 2019 CU12, Microsoft introduced it was now formally supported get rid of the previous Trade Server when running Trade Hybrid by suggests of updated Exchange Management Instruments. When the dust settled after men and women did their content dances, and folks began reading through the write-up thoroughly and seeking into the necessities in depth, it turned distinct that this elimination ONLY applies to scenarios when the Trade server running on-premises is applied for recipient management. This limits choices significantly. Most of my current prospects who have Trade hybrid deployed, have IDM options in-put which right manage Exchange On-line objects, or conduct this implicitly via Energetic Directory. When they require an Exchange server on-premises to complete this, usually by running scripts in a remote PowerShell session towards the area Exchange server, the last Trade server are not able to be taken off.

Mail Circulation

Then practically all clients who have Exchange Hybrid deployed, will need this to drop off externally, or mail destined for mailboxes that are hosted in Exchange On-line. Since Exchange Server is the only supported SMTP gateway for relaying interior messages, so that they are not categorised as normal world wide web mail (anonymous) and consequently most likely stop up in Junk E-Mail folders. Or even worse. Obtaining programs or appliances straight deliver messages to Trade On the web is of program an choice, but this is not generally possible, and also makes a dependency for the software on the internet relationship. Life is less difficult when programs can just fall messages off domestically, with some kind of availability ensure by acquiring various Trade hybrid servers. Then, it is up to Exchange to consider treatment of shipping and delivery and offer with disconnects or other delivery troubles.


First wording on some publications could direct to individuals imagining uninstalling Exchange Server was the way to remove that past Exchange server. Of study course, that is NOT the way to go. When uninstalling the very last Trade server in an firm, you will also take out all Trade-relevant characteristics from all objects. The report detailing this approach makes this crystal clear and emphasizes this additional. In summary, what you need to have to do is:

  • Validate all consumers, shared and public folder mailboxes have been migrated to Exchange On line.
  • Make sure you are only applying Exchange server to regulate receiver info, these kinds of as buyers and distribution teams.
  • Your delegation design does not count on Exchange Function-centered Access Manage (RBAC).
  • You are utilised to running recipients without having the Trade Administrative Center (UI), or have 3rd party applications in-place that deal with this for you.
  • You have no have to have to have audit documents of recipient administration.
  • You are absolutely positive you do not Exchange Server for other jobs than recipient management.
  • When not by now done so, place your Autodiscover and MX documents to Trade Online given that your Trade hybrid server will not be answering individuals requests any longer.

When you produced certain this is the way to go, you can move forward with the steps described in the Microsoft article “Regulate recipients in Trade Hybrid environments employing Administration applications“, most vital remaining shutting down the previous Exchange server (instead of uninstalling) soon after which you need to have to make some improvements to Trade configuration and cleanse up Active Listing making use of the delivered CleanupActiveDirectoryEMT.ps1 script from unused configuration aspects these kinds of as hybrid configuration, program mailboxes and Trade protection teams.

A speedy be aware: if you are at this time working an Trade hybrid deployment working with Exchange server 2016 or 2013, and want to use Trade Server 2019 CU12 administration equipment for recipient management, a schema upgrade is needed for which you can use setup’s PrepareSchema or PrepareAD switches, based on your natural environment and topology.

Function-Primarily based Access Handle

When handling Trade server domestically utilizing Trade Admin Middle or the Trade Management Shell, you use Exchange’s Part-Dependent Obtain Controls model. This product functions as a layer on prime of Lively Directory, between the administrator and Active Directory. It defines what jobs the administrator can perform, and when Exchange RBAC configuration approves the cmdlet or parameters employed in the undertaking, Trade performs the procedure in its possess stability context.

Immediately after elimination of the final Trade server, there is no Exchange server to converse to and act on behalf of the administrator. Mainly, it is the exact as handling Exchange’s Edge Servers or these recovery operations right after locking by yourself out of RBAC, by introducing the Exchange PowerShell snap-in, e.g. Increase-PSSnapIn Microsoft.Exchange.PowerShell.E2010. Only with Exchange 2019 CU12, the snap-in has a unique identify, Incorporate-PSSnapIn Microsoft.Trade.Management.PowerShell.RecipientManagement. You can test the cmdlets accessible following loading the snap-in making use of Get-Command:


Exchange 2019 CU12 will come with a script Add-PermissionForEMT.ps1 which will build a stability team “Recipient Administration EMT” (Trade Administration Device). Increase users to this team that are not member of Area Admins, but do demand recipient administration permissions.


In Trade, every single administrative operation run via RBAC from Trade can be logged. These auditing data are generally saved in an arbitration mailbox. Because there is no Trade server and no RBAC product right after removal of the previous Trade server, this also gets rid of the possibility of designed-in auditing tracking and investigation. This means no a lot more hunting the Admin Audit Log to see what account adjusted people attributes or disabled that mailbox. Security Whilst removing of the past Exchange server may possibly involve introducing complexity to the administration side of things, it of training course also lowers the assault surface area of an organization. Since there is no Trade server operating that answers requests on ports 443 or 25 or performs administration tasks as a result of Distant PowerShell sessions, there is fewer to monitor and safeguard versus. Also, as the server results in being a lot more or a lot less of a management terminal, it also puts considerably less stress on preserving up to day by deploying Cumulative Updates or Trade Safety Updates. That explained, it is still recommended to retain updating and keeping current, as Cumulative Updates might even now include fixes or improvements in way it will work or interacts with Lively Directory, but a lot less in the way Trade servers generally expose their services.


Whilst elimination of the last Exchange server is a welcome solution for a specific established of buyers, there are still parts that can be enhanced. That explained, I prefer obtaining this supported solution out there now for consumers that can reward from it, fairly than hold out for the solution that has it all but is not all set nonetheless. Also, prospects have to have to be totally positive that they want to use this selection for illustration, need to at some level prospects want to introduce Exchange on-premises for whatsoever reason, what are the repercussions of possessing cleaned up Lively Directory of portion of Trade configuration, which is one thing maybe to explore for a further long term short article.



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