.NET Framework 4.7 and Exchange Servers

.NET Framework 4.7 is currently not supported on Microsoft Exchange Servers. This is heavily documented on the Internet with many articles such as the one below:

https://supertekboy.com/2017/06/17/dont-install-net-framework-4-7-on-exchange/

However Windows Update automatically installs .NET Framework 4.7 now on servers and many of my customers have been caught out by accidently installing this latest framework update on Exchange Servers unknowingly by simply installing the latest patches.

To ensure you don't get caught out, it is recommended to put the following registry key on your Exchange Servers to block the installation of .NET Framework 4.7 on Exchange servers.

1. Tap on the Windows-key, type regedit.exe, and hit the Enter-key on the keyboard. This should start the Windows Registry Editor.
2. Go to the key: HKEY_LOCAL_MACHINE\Software\Microsoft\NET Framework Setup\NDP
3. Right-click on NDP and select New > Key.
4. Name that key WU.
5. Right-click on WU, and select New > Dword (32-bit) Value.
6. Name it BlockNetFramework47.
7. Set its value to 1 (double-click it to set value).