Exchange update step by step

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Installing Cumulative Updates and Service Packs for Exchange Server 2013
In this article I will demonstrate the step by step process for installing cumulative updates and service packs for Exchange Server 2013.

https://practical365.com/exchange-server/exchange-2013-installing-cumulative-updates/

не забываем про Exchange Server supportability matrix
особенно в разделе
Supported Active Directory environments
и
Microsoft .NET Framework
Important

• Versions of .NET Framework that aren't listed in the tables below are not supported on any version or release of Exchange. This includes minor and patch-level releases of .NET Framework.

• When upgrading Exchange from an unsupported CU to the current CU and no intermediate CUs are available, you should first upgrade to the latest version of .NET that's supported by Exchange and then immediately upgrade to the current CU. This method doesn't replace the need to keep your Exchange servers up to date and on the latest supported CU. Microsoft makes no claim that an upgrade failure will not occur using this method, which may result in the need to contact Microsoft Support Services.
https://docs.microsoft.com/en-us/exchange/plan-and-deploy/supportability-matrix?view=exchserver-2019