Microsoft’s Recent Hotfix Updates for Exchange Server
Nearly a month ago, Microsoft announced Security Updates (SUs) for various versions of Exchange Server. In an additional move, the tech giant has now rolled out Hotfix Updates (HUs) for three supported editions of Exchange Server. It is significant to highlight that these updates are not part of the regular Patch Tuesday schedule.
Fixing Major Online Archival Issues
While the latest Hotfix Updates do not include any security patches, they address a crucial issue affecting online archival processes. This problem primarily impacted on-premises users operating in hybrid environments where items tagged with Move to Archive were not being properly archived. This issue arose when the archive was located in Exchange Online, but the primary mailbox remained on an on-premises Exchange Server.
Affected Exchange Server Versions
The following versions of Exchange Server were affected and have been rectified through the latest Hotfix Updates:
- Exchange Server Subscription Edition (SE) RTM
- Exchange Server 2019 (CU14 and CU15)
- Exchange Server 2016 (CU23)
Installation Instructions and Recommendations
If you are utilizing any of the specified cumulative updates (CUs), you can easily install the September 2025 Hotfix Updates to maintain system currency. However, for those using older versions, a supported CU must be installed prior to applying the Hotfix Update. Due to the cumulative nature of Exchange updates, the September release also supports the creation of a dedicated Exchange hybrid application, which was initially introduced in the April 2025 updates.
Optional Updates and Future Benefits
It’s essential to understand that Hotfix Updates are generally considered optional. Therefore, if you are impacted by the previously mentioned online archival issue, it is advisable to proceed with the installation. Conversely, if you’re not experiencing related problems, you may opt to postpone the update. These Hotfix Updates can be obtained through Windows Update and Microsoft Update, with installation processes dictated by your IT administrators. Even if you choose to skip this particular update, any improvements will appear in future HUs, SUs, and CUs. Should you encounter unexpected issues after installation, reverting to the prior state is straightforward, as the update can be uninstalled.
Overall, keeping your Exchange Server updated is crucial for optimal performance and functionality, particularly in hybrid environments.
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