In the announcement that was aspect of the release of the most the latest set of Cumulative Updates for Exchange Server 2019 and 2016, Microsoft launched some modifications – capabilities if you will – which ended up acquired with enthusiasm. An overview of these adjustments was given in a latest ENow blog article: “Exchange Cumulative Updates – April 2022”. On the other hand, I want consider the discussion even more and zoom in on just one of these functions, which also comes about to be a preferred subject matter for consumers running Exchange Hybrid deployments: The Past Trade Server.

Up to Exchange 2019 CU12 (2022 H1), buyers that migrated to Trade On the internet have been nevertheless demanded to leave Trade-connected components working on-premises. Even currently, with all the information posted close to this subject matter, I am shocked this still amazed clients. This Trade server managing on-premises is to be applied for taking care of recipients which have their supply of authority in Lively Listing, leveraging Energetic Directory Join to propagate objects to Azure Energetic Directory and thus Exchange On the web. Also, when there is a require to relay messages from applications or multi-functionals, clients usually have to have to have an Trade server on-premises to acknowledge these messages, as Trade is the only supported mail relay products for hybrid deployments.

Receiver Management

But with the release of Exchange 2019 CU12, Microsoft announced it was now formally supported get rid of the final Exchange Server when managing Exchange Hybrid by implies of updated Trade Administration Tools. When the dust settled following persons did their pleased dances, and individuals started examining the posting thoroughly and hunting into the requirements in detail, it turned apparent that this removing ONLY applies to scenarios when the Exchange server managing on-premises is utilised for receiver administration. This limitations alternatives substantially. Most of my current shoppers who have Trade hybrid deployed, have IDM remedies in-location which instantly deal with Trade On the net objects, or conduct this implicitly through Energetic Directory. When they need to have an Trade server on-premises to carry out this, normally by working scripts in a remote PowerShell session from the area Exchange server, the final Exchange server are unable to be taken off.

Mail Flow

Then almost all customers who have Exchange Hybrid deployed, need to have this to fall off externally, or mail destined for mailboxes that are hosted in Exchange On the internet. Considering that Trade Server is the only supported SMTP gateway for relaying inner messages, so that they are not classified as typical world-wide-web mail (nameless) and thus potentially end up in Junk E-Mail folders. Or even worse. Possessing programs or appliances directly provide messages to Trade On line is of training course an option, but this is not always achievable, and also produces a dependency for the software on the net relationship. Lifetime is simpler when apps can just drop messages off regionally, with some form of availability guarantee by possessing many Exchange hybrid servers. Then, it is up to Exchange to get care of shipping and offer with disconnects or other shipping issues.


Initial wording on some publications could lead to people thinking uninstalling Exchange Server was the way to get rid of that past Exchange server. Of program, that is NOT the way to go. When uninstalling the last Exchange server in an corporation, you will also eliminate all Exchange-linked characteristics from all objects. The short article describing this approach makes this clear and emphasizes this much more. In summary, what you have to have to do is:

  • Confirm all users, shared and general public folder mailboxes have been migrated to Trade On the internet.
  • Make certain you are only working with Exchange server to control receiver facts, such as buyers and distribution teams.
  • Your delegation product does not count on Exchange Job-centered Access Manage (RBAC).
  • You are employed to controlling recipients without the Trade Administrative Centre (UI), or have 3rd celebration resources in-spot that regulate this for you.
  • You have no need to have to have audit data of recipient management.
  • You are certainly sure you do not Exchange Server for other responsibilities than receiver administration.
  • When not presently performed so, place your Autodiscover and MX documents to Exchange On the net because your Trade hybrid server will not be answering those people requests any longer.

When you manufactured confident this is the way to go, you can continue with the methods described in the Microsoft short article “Manage recipients in Trade Hybrid environments employing Administration applications“, most important remaining shutting down the last Trade server (instead of uninstalling) right after which you need to have to make some modifications to Exchange configuration and clear up Energetic Listing making use of the supplied CleanupActiveDirectoryEMT.ps1 script from unused configuration features these as hybrid configuration, process mailboxes and Exchange stability groups.

A swift be aware: if you are at the moment running an Trade hybrid deployment using Exchange server 2016 or 2013, and want to use Exchange Server 2019 CU12 administration tools for recipient management, a schema improve is expected for which you can use setup’s PrepareSchema or PrepareAD switches, dependent on your ecosystem and topology.

Role-Based Access Manage

When handling Trade server locally employing Exchange Admin Centre or the Exchange Administration Shell, you use Exchange’s Position-Based mostly Entry Controls design. This product functions as a layer on major of Active Listing, among the administrator and Energetic Listing. It defines what tasks the administrator can execute, and when Trade RBAC configuration approves the cmdlet or parameters utilised in the task, Exchange performs the procedure in its possess protection context.

After elimination of the last Exchange server, there is no Trade server to converse to and act on behalf of the administrator. Essentially, it is the exact same as managing Exchange’s Edge Servers or those people recovery operations following locking yourself out of RBAC, by introducing the Exchange PowerShell snap-in, e.g. Incorporate-PSSnapIn Microsoft.Trade.PowerShell.E2010. Only with Trade 2019 CU12, the snap-in has a distinct identify, Insert-PSSnapIn Microsoft.Exchange.Management.PowerShell.RecipientManagement. You can check the cmdlets out there immediately after loading the snap-in using Get-Command:


Exchange 2019 CU12 will come with a script Insert-PermissionForEMT.ps1 which will build a protection group “Recipient Administration EMT” (Exchange Administration Software). Add associates to this group that are not member of Domain Admins, but do have to have recipient management permissions.


In Exchange, each administrative procedure operate via RBAC in opposition to Trade can be logged. These auditing documents are normally saved in an arbitration mailbox. Because there is no Trade server and no RBAC product after removing of the past Exchange server, this also gets rid of the solution of designed-in auditing tracking and investigation. This signifies no extra exploring the Admin Audit Log to see what account improved all those characteristics or disabled that mailbox. Security While removal of the last Trade server might involve including complexity to the management facet of matters, it of class also lessens the assault surface area of an corporation. Considering that there is no Exchange server managing that responses requests on ports 443 or 25 or performs management jobs by way of Distant PowerShell sessions, there is fewer to keep an eye on and guard towards. Also, as the server becomes additional or less of a administration terminal, it also places much less stress on keeping up to day by deploying Cumulative Updates or Exchange Protection Updates. That mentioned, it is nonetheless advisable to hold updating and being recent, as Cumulative Updates may well even now contain fixes or variations in way it functions or interacts with Energetic Directory, but a lot less in the way Exchange servers generally expose their providers.


Though elimination of the very last Trade server is a welcome selection for a unique established of consumers, there are nonetheless areas that can be enhanced. That explained, I want having this supported choice readily available now for clients that can gain from it, somewhat than hold out for the alternative that has it all but is not prepared nonetheless. Also, clients have to have to be definitely absolutely sure that they want to use this alternative for case in point, should at some issue prospects want to introduce Trade on-premises for regardless of what motive, what are the effects of acquiring cleaned up Energetic Listing of aspect of Exchange configuration, which is a little something probably to examine for one more foreseeable future post.



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