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Know which Exchange update you need
Do not choose an update by filename or a generic “latest patch” label. First identify the installed Exchange release and cumulative update (CU), then check whether the server is supported and which packages apply to it. Microsoft’s Exchange Server updates page lists current releases and applicability; its product tables are live, so consult them when planning rather than relying on a copied version number.
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| Update type | What it is | What to verify |
|---|---|---|
| Cumulative update (CU) | A cumulative full build that includes changes from previous CUs. | Confirm that the target CU applies to your Exchange release, review its release notes and prerequisites, and plan it as a build upgrade. Microsoft’s CU guidance gives an estimated completion time of 180 minutes; this is an estimate for completing a CU upgrade, not a measured outage duration or a promise for your environment. |
| Security update (SU) | A security update released as needed, commonly around Patch Tuesday; newer SUs include earlier SUs for the applicable CU. | Confirm the installed CU and SU applicability before downloading. Applicability and support eligibility are release-specific, so use Microsoft’s current updates page. |
Microsoft describes CUs as generally released twice a year while Exchange is in Mainstream support; its current delivery-model description is 1–2 CUs per year, with critical product updates released as needed. These are servicing patterns, not a schedule or eligibility guarantee for every release. Support status determines which CUs and SUs are eligible. Use the current update information and product lifecycle to establish your supported target.
Microsoft advises installing available security updates rather than deciding solely from a CVE severity score: vulnerabilities can combine into attack chains. For the servicing distinctions and operational guidance, see the Exchange Server update FAQ.
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Prepare a safe maintenance window
- Inventory builds and gaps. Run Microsoft Exchange Server Health Checker across the relevant servers. Use its results to identify missing CUs, SUs, and manual actions before selecting packages.
- Check the target and prerequisites. Confirm supportability and package applicability on Microsoft’s live updates page, then read the applicable release notes and prerequisite guidance. Do this separately for each Exchange release in the environment.
- Rehearse CU changes outside production. Microsoft recommends testing a CU in a non-production environment. Confirm that working backups of both Exchange and Active Directory have been tested, and record local customizations that may need to be restored after an update. A CU cannot be uninstalled to return the server to its previous CU.
- Validate service capacity. Using your normal operational procedures, check DAG and database health, active database placement, remaining capacity, client access, and application dependencies. Do not start if the remaining members cannot safely carry the workload or if health checks show an unresolved problem.
- Set the window from your own rehearsal. Include time for the update, restarts, validation, and recovery actions. Microsoft’s 180-minute CU estimate is not a user-downtime estimate and should not replace an environment-specific change plan.
Microsoft recommends restarting before and after Exchange updates, even when Setup does not request a restart. Include both restarts in the maintenance plan.
Update DAG members one at a time
Microsoft recommends a rolling process that puts the server being updated into maintenance mode, installs the update, returns the server to production, and optionally redistributes active databases. The exact commands and sequencing depend on Exchange version and topology, which are not specified here; follow Microsoft’s version-appropriate DAG procedure rather than copying commands from another environment. See Manage database availability groups.
- Choose a healthy member. Confirm that the other DAG members and database copies can support the planned change. If shutting down a member, perform a server switchover first when appropriate. Microsoft cautions that high-availability shutdown behavior does not guarantee lossless activation for every database.
- Put only that member into maintenance mode. Follow the documented procedure for your Exchange version and check that the server is no longer taking the workload you intend to move before installing.
- Install the planned CU or applicable SU. Follow the package’s installation instructions. Microsoft notes that Exchange services and the Cluster service stop during an update on a DAG member; account for this in the change window.
- Restart and validate the updated member. Complete the required restarts, then check Exchange services, database copy health, mail flow, client access, and your organization’s monitoring signals.
- Return it to production. Take the member out of maintenance mode only when installation and checks are complete. If useful for your workload, redistribute active database copies to rebalance the DAG.
- Proceed to the next member only after recovery is confirmed. Confirm the updated server is healthy and serving its intended role before repeating the process. Microsoft advises against leaving DAG members on different Exchange versions for an extended period.
Validate the change and handle problems safely
After an SU, run Health Checker again to identify any additional actions still required. Use the same service, database, mail-flow, client-access, and monitoring checks that you used to decide the member was ready to return to production. Record the installed builds and any outstanding manual actions in the change record.
If an update fails, use Microsoft’s Exchange update repair documentation and SetupAssist guidance rather than improvising a rollback. Uninstalling a CU is not a supported way to restore the previous CU; uninstalling the CU removes Exchange from that server. Treat recovery as a planned repair path, not as a simple package reversal.
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Special cases to include in the patch plan
- Management Tools-only machines: Microsoft says these machines should receive SUs as well, to reduce incompatibility between management clients and servers. An on-premises server used only to manage Exchange objects still needs to be kept current.
- Hybrid environments: Microsoft says the Hybrid Configuration Wizard does not need to be rerun after Exchange updates.
- Non-DAG servers: The rolling DAG maintenance procedure does not apply. Plan and communicate a server-specific maintenance window based on the role, workload, recovery options, and your tested procedures; do not assume a non-DAG server has equivalent failover protection.
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