How to Download and Install Exchange 2016 CU23
Exchange Server 2016 is a popular email and collaboration platform that powers many businesses and organizations. However, like any software, it needs to be updated regularly to fix bugs, improve performance, and add new features. That's why Microsoft releases Cumulative Updates (CUs) for Exchange Server every few months.
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In this article, we will show you how to download and install Exchange 2016 CU23, which is the latest Cumulative Update for Exchange Server 2016 as of April 20, 2022. We will also explain what are the benefits, prerequisites, and requirements of this update, as well as how to troubleshoot some common issues and solutions.
What is Exchange 2016 CU23 and why you should install it
Exchange 2016 CU23 is a full installation of Exchange Server 2016 that includes all previous updates and fixes for security and nonsecurity issues. It also includes new daylight saving time (DST) updates for Exchange Server 2016. You don't need to install any previous CUs or service packs before you install Exchange 2016 CU23.
Installing Exchange 2016 CU23 will ensure that your Exchange Server is up to date, secure, stable, and compatible with other Microsoft products and services. It will also enable you to take advantage of the new features and improvements that are introduced in this update.
How to download exchange 2016 cu23 from official Microsoft site
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Download exchange 2016 cu23 Exchange Server Role Requirements Calculator reference
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Download exchange 2016 cu23 Exchange Server Remote Connectivity Analyzer Tool reference
Download exchange 2016 cu23 Exchange Server Health Checker Script reference
Download exchange 2016 cu23 Exchange Server Test Plan Generator reference
Download exchange 2016 cu23 Exchange Server Best Practices Analyzer Tool reference
What are the new features and fixes in Exchange 2016 CU23
Exchange 2016 CU23 introduces some new features and fixes that enhance the functionality, security, and performance of Exchange Server. Here are some of the highlights:
To prevent misuse of UNC paths by attackers, parameters that take UNC paths as inputs will no longer be usable in Exchange Server PowerShell cmdlets or the Exchange Admin Center. For more information, see .
The MSExchangeServiceHost service crashes repeatedly and Event ID 4999 is logged in the Windows Application event log. For more information, see .
The Get-MailboxDatabaseCopyStatus cmdlet from an Exchange Server 2013 server fails against databases on Exchange Server 2019 and 2016 servers and returns Error 0xe0434352 from RpccGetCopyStatusEx4. Workaround: Run Get-MailboxDatabaseCopyStatus from an Exchange Server 2019 or 2016 server.
Checking the Exchange Server 2019 or 2016 database status from the Exchange admin center (EAC) might fail and return an "HTTP 500" or "Your request couldn't be completed. Please try again in a few minutes" error message. Workaround: Make sure that the admin mailbox is on an Exchange Server 2019 or 2016 server. If the admin account has no mailbox, make sure that all arbitration mailboxes (especially the SystemMailbox bb558c35-97f1-4cb9-8ff7-d53741dc928c) are on an Exchange Server 2019 or 2016 server.
The UM Voicemail greetings function stops working and returns error - The UM Voicemail greetings function stops working and returns error "The operation couldn't be performed because object 'MailboxGuid' couldn't be found on 'ServerName'" after you install the March 2022 security update. For more information, see .
The Exchange Server 2019 or 2016 Edge Transport server might stop accepting inbound messages and return a "452 4.3.1 Insufficient system resources" error message. Workaround: Restart the Microsoft Exchange Transport service.
The Exchange Server 2019 or 2016 Edge Transport server might stop processing messages and return a "451 4.4.0 DNS query failed" error message. Workaround: Restart the Microsoft Exchange Transport service.
The Exchange Server 2019 or 2016 Edge Transport server might stop sending messages to the Internet and return a "451 4.4.0 Primary target IP address responded with: \"421 4.2.1 Unable to connect.\" Attempted failover to alternate host, but that did not succeed." error message. Workaround: Restart the Microsoft Exchange Transport service.
The Exchange Server 2019 or 2016 Edge Transport server might stop receiving messages from the Internet and return a "421 4.4.2 Connection dropped due to SocketError" error message. Workaround: Restart the Microsoft Exchange Transport service.
What are the prerequisites and requirements for Exchange 2016 CU23
Before you download and install Exchange 2016 CU23, you need to make sure that your server and environment meet the following prerequisites and requirements:
You need to have an active internet connection to download the update file and verify its integrity.
You need to have enough disk space to store the update file and extract its contents. The update file is about 6 GB in size, and you need at least 30 GB of free disk space on the drive where you plan to install the update.
You need to have enough memory and CPU resources to run the setup wizard or the unattended setup from the command line. The minimum memory requirement is 8 GB, and the minimum CPU requirement is a dual-core processor with a clock speed of at least 1.6 GHz.
You need to have administrator rights on the server where you plan to install the update.
You need to have a valid license for Exchange Server 2016 Standard or Enterprise edition.
You need to have all Windows updates installed on the server where you plan to install the update.
You need to have .NET Framework 4.8 installed on the server where you plan to install the update.
You need to have Visual C++ Redistributable Packages for Visual Studio 2013 installed on the server where you plan to install the update.
You need to have Windows Management Framework (WMF) version 5.1 installed on the server where you plan to install the update.
You need to have Windows Remote Management (WinRM) enabled on the server where you plan to install the update.
You need to have Windows PowerShell version 5.1 or later installed on the server where you plan to install the update.
You need to have Windows Server roles and features required for Exchange Server installed on the server where you plan to install the update. For more information, see .
You need to have Active Directory schema updates applied in your environment before you install the update on any Exchange Server in your organization. For more information, see .
How to download Exchange 2016 CU23
To download Exchange 2016 CU23, you need to follow these steps:
Go to and click on Download.
Select a location on your computer where you want to save the file and click on Save.
Wait for the download to complete. The file name is ExchangeServer2016-x64-CU23.iso and its size is about 6 GB.
Go to and scroll down to Exchange Server 2016 section.
Find Cumulative Update 23 for Exchange Server 2016 (KB5003613) in the table and copy its SHA256 hash value.
Open a Windows PowerShell window as an administrator and run the following command, where is the location of the downloaded file on your computer. This command will calculate the SHA256 hash value of the file and compare it with the one you copied from the website. Get-FileHash -Path -Algorithm SHA256 Format-List
Verify that the hash values match. If they do, it means that the file is not corrupted or tampered with. If they don't, it means that the file is invalid or compromised. In that case, you should delete the file and download it again from a trusted source.
How to install Exchange 2016 CU23
To install Exchange 2016 CU23, you need to follow these steps:
Mount the ISO file that you downloaded by right-clicking on it and selecting Mount. This will create a virtual drive on your computer with the contents of the ISO file.
Open File Explorer and navigate to the virtual drive. You should see a folder named ExchangeServer2016-x64-CU23.
Double-click on Setup.exe to launch the setup wizard. Alternatively, you can run the unattended setup from the command line by opening a Windows PowerShell window as an administrator and running the following command, .\Setup.exe /IAcceptExchangeServerLicenseTerms /Mode:Upgrade
You can also add other parameters to customize the installation. For more information, see .
Follow the instructions on the screen to complete the installation. The setup wizard will check for any issues or conflicts that may prevent the installation, such as missing prerequisites, incompatible software, or insufficient permissions. It will also perform some pre-requisite actions, such as stopping services, disabling antivirus software, and backing up registry settings. It will then copy and install the files, update the schema and configuration, and restart the services.
Wait for the installation to finish. Depending on your server configuration and performance, this may take several minutes or hours.
Verify that the installation was successful and that your Exchange Server is running Exchange 2016 CU23. You can do this by checking the build number of your Exchange Server in the Exchange admin center (EAC) or by running the following command in Windows PowerShell, Get-ExchangeServer Format-List Name,Edition,AdminDisplayVersion
The build number of Exchange 2016 CU23 is 15.01.2308.012.
How to troubleshoot common issues and solutions for Exchange 2016 CU23
If you encounter any issues or errors during or after installing Exchange 2016 CU23, you can try some of these common troubleshooting steps and solutions:
If the setup wizard fails or hangs at any stage, you can check the setup log files for more information and clues about what went wrong. The setup log files are located in %ExchangeInstallPath%\Logging\SetupLogs folder.
If you receive an error message that says "The following error was generated when '$error.Clear();' was run: 'Microsoft.Exchange.Configuration.Tasks.TaskException: The operation couldn't be performed because object 'MailboxGuid' couldn't be found on 'ServerName'", you can try to resolve it by following these steps:
Open a Windows PowerShell window as an administrator and run the following command, Get-Mailbox -Arbitration fl name,guid,database
This will list all arbitration mailboxes in your organization and their GUIDs and databases.
Find the mailbox GUID that matches the one in the error message and note its database name.
Run the following command to move the arbitration mailbox to another database, New-MoveRequest -Identity -TargetDatabase
where is the GUID of the arbitration mailbox and is the name of another database in your organization.
Wait for the move request to complete and then run the following command to remove it, Remove-MoveRequest -Identity
Rerun the setup wizard or the unattended setup from the command line.
If you receive an error message that says "The following error was generated when '$error.Clear();' was run: 'Microsoft.Exchange.Configuration.Tasks.TaskException: The operation couldn't be performed because object 'PublicFolderMailbox' couldn't be found on 'ServerName'", you can try to resolve it by following these steps:
Open a Windows PowerShell window as an administrator and run the following command, Get-Mailbox -PublicFolder fl name,guid,database
This This will list all public folder mailboxes in your organization and their GUIDs and databases.
Find the mailbox GUID that matches the one in the error message and note its database name.
Run the following command to move the public folder mailbox to another database, New-MoveRequest -Identity -TargetDatabase
where is the GUID of the public folder mailbox and is the name of another database in your organization.
Wait for the move request to complete and then run the following command to remove it, Remove-MoveRequest -Identity
Rerun the setup wizard or the unattended setup from the command line.
If you receive an error message that says "The following error was generated when '$error.Clear();' was run: 'Microsoft.Exchange.Configuration.Tasks.TaskException: The operation couldn't be performed because object 'DiscoverySearchMailbox' couldn't be found on 'ServerName'", you can try to resolve it by following these steps:
Open a Windows PowerShell window as an administrator and run the following command, Get-Mailbox -AuditLog fl name,guid,database
This will list all audit log mailboxes in your organization and their GUIDs and databases.
Find the mailbox GUID that matches the one in the error message and note its database name.
Run the following command to move the audit log mailbox to another database, New-MoveRequest -Identity -TargetDatabase
where is the GUID of the audit log mailbox and is the name of another database in your organization.
Wait for the move request to complete and then run the following command to remove it, Remove-MoveRequest -Identity
Rerun the setup wizard or the unattended setup from the command line.
If you receive an error message that says "The following error was generated when '$error.Clear();' was run: 'Microsoft.Exchange.Configuration.Tasks.TaskException: The operation couldn't be performed because object 'SystemMailbox' couldn't be found on 'ServerName'", you can try to resolve it by following these steps:
Open a Windows PowerShell window as an administrator and run the following command, Get-Mailbox -Monitoring fl name,guid,database
This will list all monitoring mailboxes in your organization and their GUIDs and databases.
Find the mailbox GUID that matches the one in the error message and note its database name.
Run the following command to move the monitoring mailbox to another database, New-MoveRequest -Identity -TargetDatabase
where is the GUID of the monitoring mailbox and is the name of another database in your organization.
Wait for the move request to complete and then run the following command to remove it, Remove-MoveRequest -Identity
Rerun the setup wizard or the unattended setup from the command line.
Conclusion
In this article, we have shown you how to download and install Exchange 2016 CU23, which is the latest Cumulative Update for Exchange Server 2016. We have also explained what are the benefits, prerequisites, and requirements of this update, as well as how to troubleshoot some common issues and solutions.
By installing Exchange 2016 CU23, you will ensure that your Exchange Server is up to date, secure, stable, and compatible with other Microsoft products and services. You will also be able to take advantage of the new features and improvements that are introduced in this update.
To keep your Exchange Server running smoothly, we recommend that you follow some best practices, such as:
Always backup your Exchange Server before installing any updates or making any changes.
Always test any updates or changes in a lab environment before applying them to your production environment.
Always install updates on all Exchange Servers in your organization as soon as possible after they are released.
Always monitor your Exchange Server performance, health, and logs for any issues or anomalies.
Always keep your Windows Server, .NET Framework, Visual C++ Redistributable Packages, Windows Management Framework, Windows Remote Management, Windows PowerShell, and Windows Server roles and features updated on your Exchange Server.
Frequently Asked Questions
Here are some frequently asked questions about Exchange You can also subscribe to the for any announcements or news about Exchange 2016 CU23.
Q: How can I get help or support for Exchange 2016 CU23 if I have any questions or issues that are not covered in this article?
A: You can get help or support for Exchange 2016 CU23 from various sources, such as:
The , where you can post your questions or issues and get answers from other Exchange Server experts and community members.
The , where you can find articles, videos, tutorials, and troubleshooting guides for Exchange Server.
The , where you can contact a Microsoft support professional by phone, chat, or email and get assistance for Exchange Server.
The , where you can find a Microsoft partner near you who can provide consulting, training, or implementation services for Exchange Server.
Q: How can I provide feedback or suggestions for Exchange 2016 CU23 or any other Cumulative Update for Exchange Server 2016?
A: You can provide feedback or suggestions for Exchange 2016 CU23 or any other Cumulative Update for Exchange Server 2016 by using the to submit your ideas or vote for existing ones.
Q: How can I learn more about Exchange 2016 CU23 or any other Cumulative Update for Exchange Server 2016?
A: You can learn more about Exchange 2016 CU23 or any other Cumulative Update for Exchange Server 2016 by reading the on YouTube to get an overview of the latest updates and features.
I hope you found this article helpful and informative. If you have any comments or questions, please feel free to leave them below. Thank you for reading! 44f88ac181
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