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Update .NET Framework in Exchange Server 2019

We like to update .NET Framework in Exchange Server 2019 because we want to run an Exchange Cumulative Update. What is the best approach to update .NET Framework in Exchange Server? Do we first update .NET Framework, or do we run the Exchange Cumulative Update? These questions are being asked a lot.

A lot of Exchange admins have seen Exchange Servers breaking and not working after a Cumulative Update. This article will teach you how to update .NET Framework when updating Cumulative Updates in Exchange Server.

It’s important to know that .NET Framework is a must for Exchange Server. When installing Cumulative Updates on Exchange 2019, we sometimes have to update .NET Framework. That is not always the case. Sometimes you can run the Cumulative Update without updating .NET Framework. Yes, we can download .NET Framework for free.

What Microsoft is saying about .NET Framework:

When upgrading Exchange Server 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 your version of Exchange Server 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.

Keep .NET Framework and Exchange Server 2019 up to date

Keep your Exchange Server 2019 up to date so that you don’t have to carry out a longer update path. I recommend downloading the Exchange CU ISO when it’s available and save it to the hard disk. Microsoft does remove older Exchange CUs when newer versions are released. When saving the Exchange CU ISO, you can always carry out the upgrade path. You can use an unofficial website to download an older Exchange CU.

How to update .NET Framework and Exchange Server Cumulative Update

Don’t immediately update when a .NET Framework version or Exchange Server version is released. Always wait and check if bugs are raising. Don’t forget to always test the Exchange Server CU in a test environment before updating it in production.

I made a flowchart that will show the procedure on how to update .NET Framework and Exchange Server Cumulative Update.

Update .NET Framework in Exchange Server 2019

To keep it simple, keep these two steps in mind when planning the update path:

  1. Update to the last Exchange version that is supported by the .NET Framework (blue arrow)
  2. Update to the last .NET Framework that is supported for the Exchange Server (green arrow)

Keep updating till you’re on the version that you want to be. It will most likely be the last released Exchange version.

Let’s have an example with the following company called EXOIP. The company is currently running Exchange Server 2019 CU1 and .NET Framework 4.7.2. They want to update to the latest Exchange Server version, which is Exchange Server 2019 CU8. Let’s have a look at how to do that without breaking the Exchange Server.

Update .NET Framework in Exchange Server 2019 example
  1. Upgrade to Exchange 2019 CU3
  2. Upgrade .NET Framework to 4.8
  3. Upgrade to Exchange 2019 CU8

Use the given flowchart. It’s easy to follow the update path for Exchange Server Cumulative Update and .NET Framework. Do not hesitate to use the comments below to ask any questions if you have them!

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In this article, you learned how to update .NET Framework in Exchange Server. Save the Cumulative Updates when available for download, as Microsoft will delete them after a newer version comes out. You might need it when carrying out the update path.

Did you enjoy this article? If so, you may like the article Install Exchange Server 2016 step by step with GUI. Don’t forget to follow us and share this article.



ALI TAJRAN is a passionate IT Architect, IT Consultant, and Microsoft Certified Trainer. He started Information Technology at a very young age, and his goal is to teach and inspire others. Read more »

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