Microsoft has released Hotfix Updates (HUs) for Exchange servers that enable support for new features and address issues in the March 2024 Security Update (SU). Customers are advised to install the Hotfix Updates directly to their Exchange systems.
Why is their Hotfix update released by Microsoft?
The latest Exchange Security update that was released by Microsoft in March 2024 was found to be causing issues with some of the important features in Exchange. To address the issues reported in March 2024, Microsoft released the Hotfix Update in April 2024.
What are the Exchange versions to which the April Hotfix applies?
The April 2024 HU is available for the following builds of Exchange Server:
• Exchange Server 2019 CU13 and CU14
• Exchange Server 2016 CU23
We installed the March 2024 SU. Should we install the April 2024 HU?
The April 2024 HU is announced by Microsoft as an optional update, but it also introduces support for ECC certificates and HMA for OWA/ECP. If you installed the March 2024 SU but did not experience any of the known issues and you don’t need the new functionality, you do not need to install the April 2024 HU and can wait until the future SU (which will include known issue fixes from April HU).
Do Administrators have to install the March SU first before installing the April 2024 HU?
The April 2024 HU includes the same security updates as the March 2024 SU, while addressing known issues with the March 2024 SU. If you did not install the March 2024 SU, you can install the April 2024 HU directly and skip the March 2024 SU.
Can the Administrator uninstall the April 2024 HU if required?
Yes. The Hotfix can be uninstalled from the Exchange servers just like the security updates.
Helient strongly recommends taking the necessary steps to install the April hotfix updates to the Exchange environment. If you would like more information or assistance, please contact our industry-leading experts at service@helient.com.
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