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Scan for outdated or missing drivers - takes under a minuteDriver Scan →Repair Windows errors before they cause bigger problemsFix Now →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Choose an Exchange update by the server’s installed version and cumulative update (CU), then verify the installed build and any required follow-up actions with Microsoft Exchange Server Health Checker. A CU is a full Exchange installation; a security update (SU) is tied to a particular CU. Exchange Server 2016 and 2019 reached end of support on October 14, 2025, so their later security-update eligibility depends on enrollment in Microsoft’s Extended Security Update (ESU) program.
CU or SU: which update does your server need?
A cumulative update replaces the Exchange installation with a full installation that includes changes from earlier CUs. You do not need to install every earlier CU—or the original RTM release—before installing a later CU. An SU addresses security issues and applies to a specific Exchange release and CU baseline.
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| Update | What it does | How to choose it |
|---|---|---|
| CU | Full Exchange installation containing changes from earlier CUs; may include fixes, features, or deprecations. | Use the CU intended for your Exchange release and deployment. You can move directly to the latest applicable CU without installing the intervening CUs. |
| SU | Security fixes for a particular Exchange release and CU. | First identify the installed CU, then use an SU published for that baseline. Later SUs for the same CU include security fixes from earlier SUs for it. |
As a result, if you skipped earlier SUs but remain on the same CU, you generally install the latest applicable SU rather than every SU in sequence. Moving to a different CU changes the baseline: check for the SU published for the new CU instead of assuming an SU for the old CU applies.
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Check support status before planning maintenance
Exchange Server 2016 and Exchange Server 2019 reached end of support on October 14, 2025. Microsoft says organizations enrolled in ESU are eligible for the December 2025 and later security updates for those versions. If your organization is not enrolled, Microsoft directs you to migrate to Exchange Server Subscription Edition (SE) to continue receiving the latest security updates. Confirm ESU enrollment rather than assuming that a 2016 or 2019 server remains on the normal update stream.
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Microsoft’s update guidance lists Exchange 2019 CU15 and Exchange 2016 CU23 as the latest CUs for those products. These products’ end-of-support status still applies; a latest CU is not the same as a supported product or a guarantee of SU eligibility.
For dated build context, Microsoft’s build table lists Exchange Server SE RTM, released July 1, 2025, as build 15.2.2562.17, and Exchange Server SE RTM Sep26SU, released September 8, 2026, as build 15.2.2562.49. These are dated examples, not a standing declaration of the latest build: check Microsoft’s current release and build information before selecting an update.
Plan a CU installation safely
CU maintenance changes a full Exchange installation, so use a runbook appropriate to your server configuration and topology. Microsoft recommends these preparations:
- Test the installation in a non-production environment.
- Make and test backups of Active Directory and Exchange before starting.
- Record customizations so you can restore or reapply them as needed. Exchange 2019 CU13 and later back up and restore common configuration files, but that does not replace reviewing your own customizations or Microsoft’s current preservation guidance.
- Restart the server before and after the installation.
- For a database availability group (DAG), place each affected member into maintenance mode using the procedures for that DAG before installing the CU.
- If you use command-line Setup, run it from an elevated command prompt.
Use the intended CU media
Mount the ISO for the CU you intend to install and run Exchange Setup. Setup’s “Connect to the Internet and check for updates” option looks for updates to the Exchange version being installed; it does not find newer CUs. Selecting that option therefore does not replace choosing the intended CU media.
Install the CU-specific security update
After confirming the server’s Exchange release and CU, select an SU published for that exact baseline and follow its release-specific installation instructions. Do not uninstall an earlier SU merely to install a newer SU for the same CU: Microsoft says the later SU includes the earlier security fixes. If you install a new CU, check separately for the applicable SU for that CU.
After an SU, run Health Checker and review its results for manual actions or other follow-up. The applicable package and any required manual steps depend on the release and update; do not treat an SU as a substitute for following its own instructions.
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Verify the installed build and update state
Use Exchange Server Health Checker as the primary per-server check. Review the report’s build number and the “Exchange IU or Security Hotfix Detected” information. Microsoft recommends running the script to identify missing CUs, SUs, or manual actions, and running it again after an SU.
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Other checks provide useful details but have limits:
Get-Command Exsetup.exe | ForEach-Object {$_.FileVersionInfo}displays version information for the installed Exchange executable.Get-ExchangeServer | Format-List Name,Edition,AdminDisplayVersionreports the CU version throughAdminDisplayVersion; it does not confirm whether a later SU or hotfix (HU) is installed.
Use the build and security-hotfix information in Health Checker—not AdminDisplayVersion alone—to assess the update state.
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Use fleet monitoring as an overview
The Microsoft 365 admin center’s Software updates (Preview) page, on its Exchange tab, reports counts of servers needing CUs, needing SUs, or out of support. It does not identify which individual servers are behind by one or more builds. Use its counts to spot fleet-level concerns, then check the affected servers individually with Health Checker and build checks to make an actionable update inventory.
Respond to a failed update by matching the symptom
Exchange update failures do not all share one safe repair. Microsoft’s “Fix failed Exchange Server updates” guidance includes targeted help for Setup requests for missing Exchange Server media and for HTTP 500 errors in Outlook on the web or the Exchange admin center after an update. Match the remediation to the actual symptom; for installation errors, Microsoft also points administrators to SetupAssist, and its FAQ directs them to a separate guide for failed CU or SU installations.
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Microsoft describes a delivery model of one to two CUs a year. Its FAQ gives general H1/H2 targets around March and September, while noting that quality can move dates; these are targets, not guaranteed release dates. Security or time-zone updates are issued as needed. Microsoft says they can typically apply to the latest CU and the immediately previous CU, but applicability must be checked against the specific release.
Microsoft’s update FAQ describes different SU support windows: during mainstream support, relevant security fixes are provided for the two latest CUs; during extended support, the FAQ describes SUs for the latest CU. Release and support status can change, and Exchange 2016 and 2019 are now out of support unless the applicable ESU arrangement covers them. Check the current release and support information for the server’s version before committing to a maintenance plan.
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