Wait, what? On April 23, 2024 Microsoft has released a hotfix update for Exchange 2016 and Exchange 2019 and as MVP’s we only learned about this last week.
A hotfix update or HU contains fixes for issues that might arise with a security update in Exchange server. For example, the March 2024 SU for Exchange server introduced a number of issues, and these are fixed with this HU. Besided hotfixes, a HU can also contain new features that did not make it in the last security update (SU) or Cumulative Update (CU). In this HU for example, Hybrid Modern Authentication for OWA and ECP is introduced as a new feature. Another new feature introduced in this HU is the support for ECC (Elliptic Curve Cryptography) certificates. ECC certificates however are not supported for the federation trust certificate, the Exchange server OAuth certificate and ECC certificates cannot be used when ADFS claims-based authentication is used.
The following issues are fixed in this HU:
- “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 message icon after installing Exchange Server March 2024 SU
- My Templates add-in doesn’t work after installing Exchange Server March 2024 SU
- Download domains not working after installing the March 2024 SU
You can download this hotfix update for Exchange server here:
Exchange 2019 CU14 HU2 – https://www.microsoft.com/en-us/download/details.aspx?id=106021
Exchange 2019 CU13 HU6 – https://www.microsoft.com/en-us/download/details.aspx?id=106022
Exchange 2016 CU23 HU13 – https://www.microsoft.com/en-us/download/details.aspx?id=106023
Be aware that the filename for all versions of this HU is the same (Exchange2019-KB5037224-x64-en.exe) so when downloading multiple versions make sure you store them at different locations.
A hotfix update is cumulative and includes all security features and fixes from the previous security updates. When running Exchange 2019 CU14 and you have not installed the March 2024 security update then there’s no need to install this first. Just continue with the immediate installation of this HU.
More information
- Released: April 2024 Exchange Server Hotfix Updates – https://techcommunity.microsoft.com/t5/exchange-team-blog/released-april-2024-exchange-server-hotfix-updates/ba-p/4120536
- Hotfix update for Exchange Server 2019 and 2016: April 23, 2024 (KB5037224) – https://support.microsoft.com/en-us/topic/hotfix-update-for-exchange-server-2019-and-2016-april-23-2024-kb5037224-35eddea8-4828-4e38-b462-db89ea1100c9
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