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Exchange Server 2016 CU23: Features, Fixes, and Download Links


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.




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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.


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.


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:


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