Microsoft has released Hotfix Updates (HUs) that enable support for new functionality and address issues in the March 2024 Security Update (SU).
The April 2024 HU is available for the following builds of Exchange Server:
New Features
The April 2024 HU introduce support for elliptic curve cryptography (ECC) certificates and hybrid modern authentication for Outlook on the web and ECP.
Support for ECC certificates
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.
Hybrid Modern Authentication (HMA) for OWA/ECP
We are also announcing that starting with April 2024 HU, HMA for OWA/ECP is also supported. This feature requires Exchange 2019 CU14 + April 2024 HU (or later). Please see the feature documentation for more information.
Issues Addressed
The April 2024 HU also addressed issues that have been reported since the release of March 2024 Security Updates for Exchange Server. The following issues in the March 2024 SUs are addressed in this HU:
- Download domains not working after installing the March 2024 SU
- “We can’t open this document” error in OWA after installing March 2024 SU
- Search error in Outlook cached mode after installing March 2024 SU
- OwaDeepTestProbe and EacBackEndLogonProbe fail after installing March 2024 SU
- Edit permissions option in the ECP can’t be edited
- Outlook doesn’t display unread envelope icon after installing Microsoft Exchange Server March 2024 S… (Note: the fix resolves this issue for new messages, after April 2024 HU or later is installed)
- My Templates add-in isn’t working after installing Microsoft Exchange Server March 2024 SU
- Published calendars might not work with a “This calendar isn’t available” error after installing March 2024 SU
March 2024 SU issue that we still need to resolve:
- Calendar printing in OWA might not work unless CTRL+P keyboard shortcut is used. We will address this in a future update.
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