How to Download and Install Cumulative Update 23 for Exchange Server 2016
If you are running Microsoft Exchange Server 2016 in your organization, you might want to keep it updated with the latest patches and fixes. One of the most important updates that you should install is Cumulative Update 23 (CU23) for Exchange Server 2016, which was released on May 3, 2023. In this article, we will explain what CU23 is, why you should install it, how to download it, how to install it, and how to verify the installation. We will also provide some common issues and troubleshooting tips that you might encounter after installing CU23.
What is Cumulative Update 23 for Exchange Server 2016?
Cumulative Update 23 for Exchange Server 2016 is a collection of bug fixes, security updates, and feature enhancements that were released since the previous cumulative update (CU22) in September 2021. Each cumulative update is a full installation of Exchange Server that includes all the previous updates, so you don't need to install any other updates before installing CU23. CU23 is also the last planned cumulative update for Exchange Server 2016, as Microsoft announced that it will end the mainstream support for this product on October 14, 2023.
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The benefits of installing Cumulative Update 23 for Exchange Server 2016
There are many benefits of installing CU23 for Exchange Server 2016, such as:
It improves the performance, stability, and security of your Exchange servers.
It fixes some known issues and bugs that might affect your email delivery, mailbox access, calendar synchronization, hybrid configuration, and more.
It adds some new features and enhancements that might improve your user experience and administration tasks. For example, CU23 enables the support for Transport Layer Security (TLS) protocol version 1.3, which offers better encryption and faster connection speed than TLS version 1.2.
The prerequisites and requirements for installing Cumulative Update 23 for Exchange Server 2016
Before you install CU23 for Exchange Server 2016, you should make sure that you meet the following prerequisites and requirements:
You should have a valid license and product key for Exchange Server 2016.
You should have enough disk space on your server to store the CU23 installation files and the backup files. The CU23 installation file size is about 7 GB, and you should have at least 30% free disk space on your system drive before installing CU23.
You should have a compatible operating system on your server. CU23 supports Windows Server 2019, Windows Server 2016, and Windows Server 2012 R2.
You should have the latest version of .NET Framework on your server. CU23 requires .NET Framework 4.8, which you can download from < a href="
You should have the latest version of Visual C++ Redistributable Package for Visual Studio 2012 on your server. CU23 requires Visual C++ Redistributable Package for Visual Studio 2012 Update 4, which you can download from .
You should have the latest version of Windows Management Framework (WMF) on your server. CU23 supports WMF 5.1, which you can download from .
You should have the latest version of Exchange Server 2016 on your server. CU23 can be installed on Exchange Server 2016 RTM or any previous cumulative update.
You should have a backup of your Exchange servers and databases before installing CU23. You can use the built-in Windows Server Backup feature or any third-party backup software to create a backup of your Exchange servers and databases.
You should have a maintenance window to install CU23 on your Exchange servers. You should plan to install CU23 during a time when the email traffic is low and the users are not accessing their mailboxes. You should also inform your users and stakeholders about the downtime and the expected duration of the installation.
How to download Cumulative Update 23 for Exchange Server 2016
There are two ways to download CU23 for Exchange Server 2016: from the official Microsoft download link or from the alternative download links.
The official Microsoft download link for Cumulative Update 23 for Exchange Server 2016
The official Microsoft download link for CU23 for Exchange Server 2016 is . You can click on the link and follow the instructions to download the CU23 installation file, which is named ExchangeServer2016-x64-CU23.iso. You can also use a download manager software to speed up the download process and resume it if it is interrupted.
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The alternative download links for Cumulative Update 23 for Exchange Server 2016
If you have trouble downloading CU23 from the official Microsoft download link, you can use the alternative download links that are provided by some reputable websites and blogs. Here are some of the alternative download links for CU23 for Exchange Server 2016:
Before you download CU23 from any of these alternative download links, you should verify that they are trustworthy and secure. You should also scan the downloaded file with an antivirus software to make sure that it is not infected with any malware.
How to install Cumulative Update 23 for Exchange Server 2016
After you have downloaded CU23 for Exchange Server 2016, you can proceed to install it on your Exchange servers. The installation process may vary depending on whether you have a single server or multiple servers in a database availability group (DAG).
The steps to install Cumulative Update 23 for Exchange Server 2016 on a single server
If you have a single server that is running Exchange Server 2016, you can follow these steps to install CU23:
Mount or extract the CU23 installation file (ExchangeServer2016-x64-CU23.iso) to a folder on your server.
Open an elevated command prompt (Run as administrator) and navigate to the folder where you mounted or extracted the CU23 installation file.
Type Setup.exe /Mode:Upgrade /IAcceptExchangeServerLicenseTerms and press Enter to start the installation.
Wait for the installation to complete. It may take several minutes depending on your server configuration and performance. You can monitor the progress of the installation on the command prompt window.
Restart your server when prompted by the installation wizard.
Repeat these steps for any other servers that are running Exchange Server 2016 in your organization.
The steps to install Cumulative Update 23 for Exchange Server 2016 on multiple servers in a DAG
If you have multiple servers that are running Exchange Server 2016 in a DAG, you can follow these steps to install CU23:
Put the first server that you want to update in maintenance mode. You can use the StartDagServerMaintenance.ps1 script that is located in the %ExchangeInstallPath%\Scripts folder on your server. For example, you can run the following command in an elevated Exchange Management Shell (EMS): .\StartDagServerMaintenance.ps1 -serverName EX01, where EX01 is the name of your server.
Mount or extract the CU23 installation file (ExchangeServer2016-x64-CU23.iso) to a folder on your server.
Open an elevated command prompt (Run as administrator) and navigate to the folder where you mounted or extracted the CU23 installation file.
Type Setup.exe /Mode:Upgrade /IAcceptExchangeServerLicenseTerms and press Enter to start the installation.
Wait for the installation to complete. It may take several minutes depending on your server configuration and performance. You can monitor the progress of the installation on the command prompt window.
Restart your server when prompted by the installation wizard.
Take the server out of maintenance mode. You can use the StopDagServerMaintenance.ps1 script that is located in the %ExchangeInstallPath%\Scripts folder on your server. For example, you can run the following command in an elevated EMS: .\StopDagServerMaintenance.ps1 -serverName EX01, where EX01 is the name of your server.
Move any active mailbox databases that were hosted on the server before the update back to the server. You can use the RedistributeActiveDatabases.ps1 script that is located in the %ExchangeInstallPath%\Scripts folder on your server. For example, you can run the following command in an elevated EMS: .\RedistributeActiveDatabases.ps1 -DagName DAG01 -BalanceDbsByActivationPreference -ShowFinalDatabaseDistribution -Confirm:$false, where DAG01 is the name of your DAG.
Repeat these steps for any other servers that are running Exchange Server 2016 in your DAG. You should update one server at a time and make sure that each server is fully functional before moving to the next one.
How to verify the installation of Cumulative Update 23 for Exchange Server 2016
After you have installed CU23 for Exchange Server 2016, you should verify that the installation was successful and that your Exchange servers are working properly. There are two methods to check the build number and version of Exchange Server 2016 after installing CU23, and some common issues and troubleshooting tips that you might encounter after installing CU23.
The methods to check the build number and version of Exchange Server 2016 after installing Cumulative Update 23
You can use either of these methods to check the build number and version of Exchange Server 2016 after installing CU23:
The first method is to use EMS. You can run the following command in an elevated EMS: Get-ExchangeServer Format-Table Name, Edition, AdminDisplayVersion. The output will show you the name, edition, and version of each Exchange server in your organization. The build number and version of CU23 for Exchange Server 2016 is 15.01.2308.012.
The second method is to use Exchange Admin Center (EAC). You can log in to EAC with your administrator credentials and navigate to Servers > Servers. The list will show you the name, role, edition, and version of each Exchange server in your organization. The build number and version of CU23 for Exchange Server 2016 is 15.01.2308.012.
The common issues and troubleshooting tips after installing Cumulative Update 23 for Exchange Server 2016
Although CU23 for Exchange Server 2016 is supposed to fix some issues and bugs, it might also introduce some new ones or cause some unexpected problems. Here are some of the common issues and troubleshooting tips that you might encounter after installing CU23:
If you encounter any errors or warnings during the installation of CU23, you should check the installation log files that are located in the %ExchangeInstallPath%\Logging\UpdateExchange folder on your server. You can also use the Exchange Setup Log Analyzer tool that is available to analyze the log files and get some recommendations.
If you experience any issues with your email delivery, mailbox access, calendar synchronization, hybrid configuration, or other Exchange features after installing CU23, you should run the Exchange Server Health Checker script that is available to check the health and performance of your Exchange servers and get some suggestions.
If you notice any issues with your Active Directory schema or configuration after installing CU23, you should run the Active Directory Schema Analyzer tool that is available to compare the schema and configuration before and after the installation of CU23 and identify any changes or discrepancies.
If you have any questions or feedback about CU23 for Exchange Server 2016, you can visit the Exchange Server TechCommunity forum that is available and join the discussion with other Exchange experts and users.
Conclusion
In this article, we have explained how to download and install Cumulative Update 23 for Exchange Server 2016, which is the last planned cumulative update for this product. We have also provided some benefits, prerequisites, requirements, steps, methods, issues, and tips for installing CU23. We hope that this article has helped you to update your Exchange servers and enjoy the latest features and fixes that CU23 offers. If you have any comments or questions, please feel free to leave them below.
Frequently Asked Questions
Here are some of the frequently asked questions about CU23 for Exchange Server 2016:
Q: How long does it take to install CU23 for Exchange Server 2016?
A: It depends on your server configuration and performance, but it usually takes between 30 minutes to an hour per server.
Q: Do I need to restart my server after installing CU23 for Exchange Server 2016?
A: Yes, you need to restart your server after installing CU23 for Exchange Server 2016.
Q: Do I need to update my Outlook clients after installing CU23 for Exchange Server 2016?
A: No, you don't need to update your Outlook clients after installing CU23 for Exchange Server 2016. However, it is recommended that you keep your Outlook clients updated with the latest patches and fixes as well.
Q: Do I need to install any other updates before installing CU23 for Exchange Server 2016?
A: No, you don't need to install any other updates before installing CU23 for Exchange Server 2016. Each cumulative update is a full installation of Exchange Server that includes all the previous updates.
Q: How can I uninstall CU23 for Exchange Server 2016 if I encounter any problems?
A: You cannot uninstall CU23 for Exchange Server 2016 once you have installed it. You can only revert to a previous version of Exchange Server by restoring a backup of your server and databases that was taken before installing CU23.
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