Please see the March 2024 SU release blog post for installation tips and information related to security fixes included.ĭocumentation may not be fully available at the time this post is published. We are simply announcing that those two features are now supported starting with April 2024 HU.Ĭan April 2024 HU be uninstalled (if the need arises)? The April 2024 HU will be included in subsequent updates for Exchange Server. Will the two new features (support for ECC certificates and HMA for OWA/ECP) also be rolled into future updates, or must we install this specific HU to get them? The security content of the April 2024 HU is the same as in March 2024 SU. The April 2024 HU will appear as an optional update for your servers.ĭoes the April 2024 HU contain any security updates not included in the March 2024 SU? Will our servers automatically install the April 2024 HU? Our Exchange servers update automatically through Windows / Microsoft Update. If you did not install the March 2024 SU, you can install the April 2024 HU directly and skip the March 2024 SU. The April 2024 HU includes the same security updates as the March 2024 SU, while addressing known issues with the March 2024 SU. Do we have to install the March SU first before installing the April 2024 HU? We did not yet install the March 2024 SU.

If you installed the March 2024 SU but did not experience any of 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). The April 2024 HU is an optional update, but it does also introduce support for ECC certificates and HMA for OWA/ECP. This is the first HU released for Exchange Server, so to help you decide if you should install this update, we have prepared the following questions and answers: Calendar printing in OWA might not work unless CTRL+P keyboard shortcut is used.March 2024 SU issue that we still need to resolve: Published calendars might not work with a 'This calendar isn't available' error after installing March 2024 SU.My Templates add-in isn't working after installing Microsoft Exchange Server March 2024 SU.(Note: the fix resolves this issue for new messages, after April 2024 HU or later is installed) Outlook doesn't display unread envelope icon after installing Microsoft Exchange Server March 2024 S.Edit permissions option in the ECP can't be edited.OwaDeepTestProbe and EacBackEndLogonProbe fail after installing March 2024 SU.Search error in Outlook cached mode after installing March 2024 SU.'We can't open this document' error in OWA after installing March 2024 SU.Download domains not working after installing the March 2024 SU.The following issues in the March 2024 SUs are addressed in this HU: The April 2024 HU also addressed issues that have been reported since the release of March 2024 Security Updates for Exchange Server. Please see the feature documentation for more information. This feature requires Exchange 2019 CU14 + April 2024 HU (or later). We are also announcing that starting with April 2024 HU, HMA for OWA/ECP is also supported.

Hybrid Modern Authentication (HMA) for OWA/ECP Starting with April 2024 HU, Exchange Server 2016 and Exchange Server 2019 now support ECC certificates except when used in Active Directory Federation Services (AD FS) scenarios. The April 2024 HU introduce support for elliptic curve cryptography (ECC) certificates and hybrid modern authentication for Outlook on the web and ECP. The April 2024 HU is available for the following builds of Exchange Server: Microsoft has released Hotfix Updates (HUs) that enable support for new functionality and address issues in the March 2024 Security Update (SU).

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