Exchange Cumulative Update Step by Step

Microsoft Exchange Server 2013 Cumulative Update 23. Because each CU is a full installation of Exchange and it include updates and changes from all previous CUs, you don't need to install any previous CUs or service packs.

Pre-Requisites:

1. We have to do to schema and AD preparation for CU23 and require enterprise and schema admin rights.
2. .Net 4.7 required NDP472-KB4054530-x86-x64-AllOS-ENU
3. Backup web.config files if you done any customization because it will be over written with default settings. 

Step by Step CU23 installation:

Step 1: Download and copy the installation file (Exchange2013-x64-cu23.exe) - Download

Step 2: Move all the databases mounted on the server which you are going to perform the installation using below command. Once moved, check all the DB's are healthy.

Move-activemailboxdatabase –server "Servername" -skipclientexperiencechecks

Step 3: Run the below commands in Exchange management shell to keep the server components in maintenance mode.

Set-ServerComponentState "Servername" –Component HubTransport –State Draining –Requester Maintenance

Set-ServerComponentState "Servername" –Component ServerWideOffline –State InActive –Requester Maintenance

Set-MailboxServer "Servername" -DatabaseCopyAutoActivationPolicy blocked

Step 4: .Net Frame work 4.7 required, install it using below file available under D:\Softwares

NDP472-KB4054530-x86-x64-AllOS-ENU

Extract the CU24 installation file to D:\CU23 by running Exchange2013-x64-cu23.exe

Note: Kindly verify whether D drive is having enough free space to extract the files (at least 20-30GB).

Step 5: Open command prompt with admin rights and navigate to the path D:\CU23. Run the below commands to prepare AD.
            Run setup.exe /PrepareSchema /IAcceptExchangeServerLicenseTerms (requires Enterprise Admins and Schema Admins permissions, and must be performed in the same AD Site)

Run setup.exe /PrepareAD /IAcceptExchangeServerLicenseTerms

Run setup.exe /PrepareDomain /IAcceptExchangeServerLicenseTerms in each domain in your forest that contains Exchange servers or mailboxes

Step 6: Setup /m:upgrade /IacceptExchangeServerLicenseTerms

Example: D:\CU23>Setup /m:upgrade /IacceptExchangeServerLicenseTerms

Note: During the installation you might get below errors.

Error 1: You might get error to restart the server. Restart the server and rerun the installation using the command mentioned in step 6.

Error 2: Some processes will be in running state and you need to end that process using below command. This command to be executed against all processes which will be shown during installation

taskkill.exe /pid <processID> /f     (Example: taskkill.exe /pid 14684 /f)

Process id will be displayed in the error. Once the processes are killed, rerun the installation using the command mentioned in step 6 (setup /m:upgrade /IacceptExchangeServerLicenseTerms)

Step 7: Once the installation is completed restart the server.

Step 8: Once the server rebooted then resume the cluster node in failover cluster management.

Step 9: Run the below commands in Exchange management shell to bring back the server components to active state.

Set-ServerComponentState "Servername"  –Component HubTransport –State Active –Requester Maintenance

Set-ServerComponentState "Servername"  –Component ServerWideOffline –State Active –Requester Maintenance

Set-MailboxServer "servername" -DatabaseCopyAutoActivationPolicy unrestricted

Step 10: update the web.config files, if any customization.

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Exchange Health checks after successful installation:

Perform the health checks after the installation.

1.       Verify the exchange version using the below command

a.      Get-exchangeserver “servername” | fl name,*version*

b.       The AdminDisplayVersion should be “Version 15.0 (Build 15.00.1497.002)

2.       Verify the mail queue using the below command

a.      Get-queue “servername”

3.       Verify the services health using the below command

a.      Test-serviceshealth

4.       Verify the replication using the below command

a.      Test-replicationhealth

5.       Verify the copy status of databases

a.      Get-mailboxdatabasecopystatus –server “Servername”

6.       Verify the mail flow using the below command

a.      Test-mailflow

7.       Verify the MAPI connectivity using the below command

a.      Test-mapiconnectivity

8.       Verify the OWA and ECP console connectivity for client access servers.

Note: For each server the installation will take 2 hours approximately.

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Exchange CU23 Known issues: https://support.microsoft.com/en-us/help/4489622/cumulative-update-23-for-exchange-server-2013

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