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:

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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