Exchange Server October 2025 Security Updates
Hi All,
Microsoft has released the Exchange Server Security Updates yesterday for these Exchange Server Versions:
- Exchange Server Subscription Edition (SE)
- Exchange Server 2019
- Exchange Server 2016
October 2025 SUs are the last publicly available SUs for Exchange Server 2016 and 2019. From this point forward, only customers who contacted their Microsoft Account Teams to get the Extended Security Update (ESU) for those versions will receive new SUs that we might release for Exchange 2016 and 2019, through April 2026.
Exchange Team Blog Article
Issues that this hotfix update fixes:
- Auth Certificate export through Exchange cmdlet is no longer supported
Exchange Server Subscription Edition
In my case, i’ve downloaded the Security Update for Exchange Server Subscription Edition
Check Pending Reboot
It’s best to check for Pending Reboot, before the installation.
Check for pending reboot with PowerShell
.\Check-PendingReboot.ps1
Installation
After the reboot, i started the *.exe File
Installation was successful
You have to Reboot after the Installation
Check Version
Check the Exchange Server Version
Get-Command Exsetup.exe | ForEach-Object {$_.FileVersionInfo}
Healthchecker
After Updating Exchange you should always run HealthChecker
Run HealthChecker to update Version
.\HealthChecker.ps1
Run HealthChecker and check the Warnings and Errors
.\HealthChecker.ps1
Regards
Andres Bohren
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