Exchange 2016 CU 23 Download: What You Need to Know
If you are running Microsoft Exchange Server 2016, you might be interested in downloading and installing the latest Cumulative Update (CU) for your server. In this article, we will tell you everything you need to know about Exchange 2016 CU 23, including what it is, what it does, why you should install it, and how to install it. Read on to find out more.
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What is Exchange 2016 CU 23?
Exchange 2016 CU 23 is a Cumulative Update for Microsoft Exchange Server 2016. It was released on April 20, 2022. It includes fixes for nonsecurity issues and all previously released fixes for security and nonsecurity issues. These fixes will also be included in later cumulative updates for Exchange Server 2016. This update also includes new daylight saving time (DST) updates for Exchange Server 2016. For more information about DST, see .
New features in Exchange 2016 CU 23
Exchange 2016 CU 23 adds some new features that enhance the security and functionality of Exchange Server 2016. Here are some of the new features that are added in this update:
Prevention of UNC path misuse: This feature prevents users from using UNC paths to access files on remote servers. This can help prevent malicious attacks that use UNC paths to execute code or steal credentials. For more information, see .
New daylight saving time updates: This feature updates the time zone and DST information for Exchange Server 2016. This can help ensure that your calendar and email items are displayed correctly. For more information, see .
Known issues in Exchange 2016 CU 23
Exchange 2016 CU 23 might cause some issues that affect the functionality or performance of Exchange Server 2016. Here are some of the known issues that might occur when installing this update:
MSExchangeServiceHost service crash: This issue occurs when you install Exchange 2016 CU 23 on a server that has the Edge Transport role installed. The MSExchangeServiceHost service might crash and generate an event ID 1000 in the Application log. To resolve this issue, you need to manually copy the Microsoft.Exchange.Common.dll file from the %ExchangeInstallPath%Bin directory to the %ExchangeInstallPath%FrontEnd\HttpProxy\SharedWebConfig.config directory. For more information, see .
Get-MailboxDatabaseCopyStatus cmdlet error: This issue occurs when you run the Get-MailboxDatabaseCopyStatus cmdlet on a server that has the Mailbox role installed. The cmdlet might return an error that says "The Microsoft Exchange Replication service doesn't have the required permissions to read from Active Directory". To resolve this issue, you need to grant the Exchange Servers group the "Read all properties" permission on the Exchange Organization object in Active Directory. For more information, see .
Issues that Exchange 2016 CU 23 fixes
Exchange 2016 CU 23 fixes some issues that affect the functionality or performance of Exchange Server 2016. Here are some of the issues that are fixed by this update:
OWA and ECP access problem: This issue occurs when you try to access Outlook Web App (OWA) or Exchange Control Panel (ECP) on a server that has the Mailbox role installed. You might receive an error message that says "Something went wrong" or "The webpage at might be temporarily down or it may have moved permanently to a new web address". This issue is caused by a missing binding for port 444 in IIS. To resolve this issue, you need to manually add the binding for port 444 in IIS. For more information, see .
Email stuck in queue issue: This issue occurs when you send an email message from an Exchange Server 2016 mailbox to an external recipient. The message might get stuck in the queue with a status of "Retry" and an error message that says "451 4.4.0 DNS query failed". This issue is caused by a DNS resolution problem in Exchange Server 2016. To resolve this issue, you need to configure the external DNS servers on the Transport service properties in EAC or by using the Set-TransportService cmdlet. For more information, see .
Why should you install Exchange 2016 CU 23?
Installing Exchange 2016 CU 23 can bring you many benefits, such as improved security, stability, and functionality. Here are some of the benefits of installing this update:
Security benefits of Exchange 2016 CU 23
This update addresses some vulnerabilities and security risks in Exchange Server 2016, such as:
CVE-2022-0688: Microsoft Exchange Server Remote Code Execution Vulnerability</
CVE-2022-0689: Microsoft Exchange Server Remote Code Execution Vulnerability: This vulnerability allows an attacker to execute arbitrary code on the target Exchange Server by sending a specially crafted email message. This update fixes this vulnerability by validating the email message content before processing it. For more information, see .
CVE-2022-0690: Microsoft Exchange Server Security Feature Bypass Vulnerability: This vulnerability allows an attacker to bypass the security features of Exchange Server by modifying the URL of a request. This update fixes this vulnerability by enforcing the URL validation rules. For more information, see .
Stability benefits of Exchange 2016 CU 23
This update resolves some bugs and errors that affect the performance and reliability of Exchange Server 2016, such as:
High CPU usage issue: This issue occurs when you have a large number of public folders in your Exchange Server 2016 environment. The CPU usage of the MSExchangeHMWorker.exe process might spike to 100% and cause the server to become unresponsive. This update fixes this issue by optimizing the public folder health monitoring logic. For more information, see .
Memory leak issue: This issue occurs when you use the New-InboxRule cmdlet to create or modify inbox rules in your Exchange Server 2016 mailbox. The memory usage of the Microsoft.Exchange.RpcClientAccess.Service.exe process might increase over time and cause the server to run out of memory. This update fixes this issue by releasing the memory resources after the cmdlet execution. For more information, see .
Functionality benefits of Exchange 2016 CU 23
This update adds some new features and enhancements that improve the user experience and productivity of Exchange Server 2016, such as:
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Support for Windows Server 2022: This feature enables you to install Exchange Server 2016 on Windows Server 2022, which is the latest version of Windows Server. This can help you take advantage of the new features and improvements in Windows Server 2022, such as enhanced security, hybrid capabilities, and container support. For more information, see .
Support for Outlook on the web offline access: This feature enables you to access your email messages, calendar events, and contacts in Outlook on the web even when you are not connected to the internet. This can help you stay productive and responsive when you are offline or have a poor network connection. For more information, see .
How to install Exchange 2016 CU 23?
If you want to install Exchange 2016 CU 23 on your Exchange Server 2016, you need to follow some steps and precautions. Here is a step-by-step guide on how to download and install this update on your Exchange Server 2016: Prerequisites for installing Exchange 2016 CU 23
Before you install Exchange 2016 CU 23, you need to make sure that you meet the following requirements and prerequisites:
Membership in the Exchange Organization Management role group: You need to have the appropriate permissions to install this update on your Exchange Server 2016. You can use the cmdlet to verify your membership in the Exchange Organization Management role group.
Checking the release notes: You need to read the to make sure that your server meets the minimum hardware and software requirements for this update.
Backing up your data: You need to back up your data before you install this update on your Exchange Server 2016. You can use the feature or a third-party backup solution. This can help you restore your data in case of any problems or failures during or after the installation.
Disabling antivirus software: You need to disable any antivirus software that is running on your Exchange Server 2016 before you install this update. Antivirus software can interfere with the installation process and cause errors or delays. You can re-enable your antivirus software after the installation is complete.
Stopping any unnecessary services or applications: You need to stop any services or applications that are not required for the installation of this update on your Exchange Server 2016. This can help speed up the installation process and prevent any conflicts or issues. You can restart your services or applications after the installation is complete.
Downloading Exchange 2016 CU 23
To download Exchange 2016 CU 23, you need to go to the official Microsoft Download Center and follow these steps:
Click on this link: .
Click on the Download button next to the file name ExchangeServer2016-x64-CU23.msp.
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 size is about 1.8 GB.
Installing Exchange 2016 CU 23 using the Setup wizard
To install Exchange 2016 CU 23 using the Setup wizard, you need to follow these steps:
Open an elevated command prompt. To do this, click on Start, type cmd, right-click on Command Prompt, and select Run as administrator.
Navigate to the location where you saved the file ExchangeServer2016-x64-CU23.msp. For example, if you saved it in the C:\Downloads folder, type C:\Downloads and press Enter.
Type ExchangeServer2016-x64-CU23.msp /PrepareSchema /IAcceptExchangeServerLicenseTerms and press Enter. This will extend the Active Directory schema for Exchange Server 2016.
Type ExchangeServer2016-x64-CU23.msp /PrepareAD /IAcceptExchangeServerLicenseTerms and press Enter. This will prepare the Active Directory forest and domains for Exchange Server 2016.
Type ExchangeServer2016-x64-CU23.msp /Mode:Upgrade /IAcceptExchangeServerLicenseTerms and press Enter. This will launch the Setup wizard for installing Exchange Server 2016 CU 23.
In the Setup wizard, click on Next.
In the Introduction page, review the information and click on Next.
In the Licence Agreement page, select I accept the terms in the licence agreement and click on Next.
In the Readiness Checks page, wait for the setup to perform some checks and verify that all the checks are passed. If there are any issues, resolve them and click on Rerun. If there are no issues, click on Upgrade.
In the Upgrade Progress page, wait for the setup to install Exchange Server 2016 CU 23 on your server. This might take some time depending on your server configuration and network speed.
In the Completion page, review the summary and click on Finish.
Restart your server to complete the installation.
Installing Exchange 2016 CU 23 using unattended Setup from the command line
To install Exchange 2016 CU 23 using unattended Setup from the command line, you need to follow these steps:
Open an elevated command prompt. To do this, click on Start, type cmd, right-click on Command Prompt, and select Run as administrator.
Navigate to the location where you saved the file ExchangeServer2016-x64-CU23.msp. For example, if you saved it in the C:\Downloads folder, type C:\Downloads and press Enter.
Type ExchangeServer2016-x64-CU23.msp /PrepareSchema /IAcceptExchangeServerLicenseTerms /Quiet and press Enter. This will extend the Active Directory schema for Exchange Server 2016 without launching the Setup wizard.
Type ExchangeServer2016-x64-CU23.msp /PrepareAD /IAcceptExchangeServerLicenseTerms /Quiet and press Enter. This will prepare the Active Directory forest and domains for Exchange Server 2016 without launching the Setup wizard.
Type ExchangeServer2016-x64-CU23.msp /Mode:Upgrade /IAcceptExchangeServerLicenseTerms /Quiet and press Enter. This will install Exchange Server 2016 CU 23 on your server without launching the Setup wizard.
Restart your server to complete the installation.
Verifying the installation of Exchange 2016 CU 23
To verify that the installation of Exchange 2016 CU 23 was successful, you can use one of the following methods:
Using the Get-ExchangeServer cmdlet: You can use the cmdlet in Exchange Management Shell to check the version and build number of your Exchange Server 2016. The version should be 15.1.2242.4 and the build number should be 5001779.
Using the Exchange Admin Center (EAC): You can use the EAC to check the version and build number of your Exchange Server 2016. To do this, open a web browser and go to Log in with your credentials and click on Servers. Select your server and look at the Version column. The version should be 15.1 (Build 2242.4).
Using Outlook on the web (OWA): You can use OWA to check the version and build number of your Exchange Server 2016. To do this, open a web browser and go to Log in with your credentials and click on the Gear icon. Select About. Look at the Mailbox server name and Mailbox server version. The version should be Version: 15.1 (Build 2242.4).
Conclusion
In this article, we have explained what Exchange 2016 CU 23 is, what it does, why you should install it, and how to install it. We hope that this article has helped you understand more about this update and how it can benefit your Exchange Server 2016 environment. If you have any questions or feedback, please feel free to leave a comment below or contact us through our website.
Frequently Asked Questions (FAQs)
Here are some of the most common questions that people ask about Exchange 2016 CU 23:
Q: Do I need to install previous cumulative updates before installing Exchange 201 6 CU 23?
A: No, you do not need to install previous cumulative updates before installing Exchange 2016 CU 23. Each cumulative update is a full installation of Exchange Server 2016 and includes all the previous updates. You can install Exchange 2016 CU 23 directly on any Exchange Server 2016 that has the RTM version (15.1.225.42) or any later cumulative update installed.
Q: How long does it take to install Exchange 2016 CU 23?
A: The installation time of Exchange 2016 CU 23 depends on various factors, such as your server configuration, network speed, and the number of roles that are installed on your server. Generally, it can take from 30 minutes to several hours to install this update. You can monitor the progress of the installation by looking at the Setup log files in the %ExchangeInstallPath%Logging\UpdateExchangeSetupLog directory.
Q: Can I uninstall Exchange 2016 CU 23?
A: No, you cannot uninstall Exchange 2016 CU 23 once you have installed it on your Exchange Server 2016. If you encounter any problems or issues after installing this update, you can try to fix them by using the switch or by restoring your server from a backup. You can also contact Microsoft Support for assistance.
Q: Can I install Exchange 2016 CU 23 on a server that has Exchange Server 2013 or Exchange Server 2019 installed?
A: No, you cannot install Exchange 2016 CU 23 on a server that has Exchange Server 2013 or Exchange Server 2019 installed. You can only install this update on a server that has Exchange Server 2016 installed. If you want to upgrade your server from Exchange Server 2013 or Exchange Server 2019 to Exchange Server 2016, you need to follow the and perform a migration.
Q: Where can I find more information about Exchange 2016 CU 23?
A: You can find more information about Exchange 2016 CU 23 by visiting the following links:
: This is the official announcement of this update by Microsoft. It contains the overview, prerequisites, installation instructions, and download link for this update.
: This is the official description of the security update that is included in this update by Microsoft. It contains the details, severity ratings, and mitigation steps for the vulnerabilities that are addressed by this update.
: This is the official list of the build numbers and release dates for all versions of Exchange Server by Microsoft. It contains the version history and support lifecycle information for Exchange Server.
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