It happend again.
A new .Net Framework version has been released via the Windows Update distribution channel and the Exchange Server Team has decided to skip support for the new release.
You're only option is to block the automatic installation by the local Windows Update Agent using a registry.
The follow BlockNetFramework472.reg file simplifies setting the registry key.
As always... Enjoy Exchange Server
Sometimes you need to know the version of the installed .NET Framework version quickly.
Simply use the following PowerShell one-liner:
(Get-ItemProperty -Path 'HKLM:\SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full' ).Release