Update procedure Exchange CU21 & Security update

Download Cumulative Update 21 for Exchange Server 2016 (KB5003611) :
https://www.microsoft.com/en-us/download/details.aspx?id=103242

Download Security Update For Exchange Server 2016 CU21 (KB5004779) :
https://www.microsoft.com/en-us/download/details.aspx?id=103311

  • Start by updating Active Directory using the latest CU installation binaries. 

    We recommend that you use the latest CU for the /PrepareAD even if you don’t install the latest CU. If the operation requires a schema upgrade, the /PrepareSchema operation must be performed on a computer that’s a member of the same Active Directory domain and site as the schema master. This computer also needs .Net Framework 4.8. Learn more https://docs.microsoft.com/en-us/Exchange/plan-and-deploy/prepare-ad-and-domains?view=exchserver-2019

extend the schema for Exchange, run the following command in a Windows Command Prompt window:

E:\Setup.exe /IAcceptExchangeServerLicenseTerms /PrepareSchema
PS exe /IAcceptExchangeServerLicenseTerms /prepareschema 
icrosoft Exchange Server 2016 Cumulative Update 21 Unattended Setup 
opying Files... 
File copy compl ete. Setup will now collect additional information needed for installation. 
Performing Microsoft Exchange Server Prerequisite Check 
Prerequisite Analysis 
onfiguring Microsoft Exchange Server 
Extending Active Directory schema 
he Exchange Server setup operation completed successfully. 
PS 
COMPLETED 
COMPLETED

To prepare Active Directory for Exchange, run the following command in a Windows Command Prompt window:

E:\Setup.exe /IAcceptExchangeServerLicenseTerms /PrepareAD /OrganizationName:"wml.nl"
PS exe /IAcceptExchangeServerLicenseTerms /PrepareAD 
icrosoft Exchange Server 2016 Cumulative Update 21 Unattended Setup 
opying Files. 
File copy complete. Setup will now collect additional information needed for installation. 
erforming Mi crosoft Exchange Server Prerequisite Check 
Prerequisite Analysis 
onfiguring Microsoft Exchange Server 
Organi zation Preparation 
he Exchange Server setup operation completed successfully. 
CC*PLETED 
CC*PLETED
  • Save all customized Exchange and Internet Information Services (IIS) settings you’ve made, as they might be overwritten by the upgrade. These could be anything you didn’t use PowerShell to modify, like custom registry entries and Outlook on the web (OWA) customizations.
  • Install CU21, and then reboot the server.

IMPORTANT: You must install the CU from an elevated command prompt. If the CU installation is being started from PowerShell, 

E:\setup.exe /m:upgrade /IAcceptExchangeServerLicenseTerms
PS exe /m:upgrade /1AcceptExchangeServerLicenseTerms 
icrosoft Exchange Server 2016 Cumulative Update 21 Unattended Setup 
opying Files... 
File copy complete. Setup will now collect additional information needed for installation. 
L anguages 
anagement tools 
ailbox role: Transport service 
ailbox role: Client Access service 
ailbox role: Unified Messaging service 
ailbox role: Mailbox service 
ailbox role: Front End Transport service 
ailbox role: Client Access Front End servi ce 
Performing Mi crosoft Exchange Server Prerequisite Check 
Configuring Prerequisites 
Prerequisite Analysis 
onfiguring Microsoft Exchange Server 
Preparing Setup 
Stopping Servi ces 
Language Files 
Removing Exchange Fi les 
Preparing Fi les 
Copying Exchange Files 
Language Files 
Restoring Servi ces 
Language Configuration 
Exchange Managernent Tools 
Mailbox role: Transport service 
Mailbox role: Client Access servi ce 
Mailbox role: Unified Messaging service 
Mailbox role: Mailbox service 
Mailbox role: Front End Transport servi ce 
Mailbox role: Client Access Front End service 
Finalizing Setup 
he Exchange Server setup operation cornpleted successfully. 
COMPLETED 
COMPLETED 
COMPLETED 
COMPLETED 
COMPLETED 
COMPLETED 
COMPLETED 
COMPLETED 
COMPLETED 
COMPLETED 
COMPLETED 
COMPLETED 
COMPLETED 
COMPLETED 
COMPLETED 
COMPLETED 
COMPLETED 
COMPLETED 
COMPLETED
  • Install the latest applicable security update (SU) as listed in Exchange Server build numbers and release dates. 
    https://aka.ms/exdepwizsu
Follow these steps:

Select Start, and then enter cmd.

In the results, right-click Command prompt, and then select Run as administrator.

If the User Account Control box appears, verify that the default action is the action that you want, and then select Continue.

Enter the full path of the .msp file, and then press Enter.

IMPORTANT: When installing the security update manually you must run it from an elevated command prompt. If you don’t, the install might complete, but the server won’t be protected.

 

Exchange Server 2016 Security Update Setup 
Installing Security Update for Exchange Server 2016 Cumulative Update 21 (KB5004779) 
Please wait whie fre Setup Wizard nstalls Security Update for Exchange Server 2016 Cumulative update 21 
065004779). This may take several nnutes. 
x 
Status: 
Stopphg services 
PS & 
. msp
  • Reboot the server, even if you aren’t prompted to do so.
  • Reimport your saved customizations.
  • Check that all Exchange services are back to their previously noted state.
  • Take the server out of maintenance mode.
  • Check all additional applications that connect to Exchange, including your backup, archiving, and monitoring solutions.

Test mail flow

Test-Mailflow -TargetEmailAddress [email protected]

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