Determine which .NET Framework versions are installed
https://docs.microsoft.com/en-us/dotnet/framework/migration-guide/how-to-determine-which-versions-are-installed
The Release REG_DWORD value in the registry represents the version of .NET Framework installed.
reg query "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full"
Exchange Server build numbers and release dates
https://docs.microsoft.com/en-us/exchange/new-features/build-numbers-and-release-dates?view=exchserver-2019
Get-ExchangeServer | Format-List Name,Edition,AdminDisplayVersion
MSFAQ
https://www.msxfaq.de/exchange/update/servicepack2016.htm#exchange_2016_cu7
Exchange Server-Support-Marix
https://docs.microsoft.com/de-at/Exchange/plan-and-deploy/supportability-matrix?view=exchserver-2016#microsoft-net-framework
-> Compare Exchange-Version to supported .NET-Version
Upgrade Paths for CU’s & .NET
https://eightwone.com/2017/12/21/upgrade-paths-for-cus-net/
Howto Upgrade
Login als ADMINISTRATOR!!!
start Exchange Management-Shell with admin-rights
Get-ExchangeServer | Format-List Name,Edition,AdminDisplayVersion
deactivate AVSet-MpPreference -DisableRealtimeMonitoring $true
reg query "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full"
set Power-shell Execution-PolicyGet-ExecutionPolicy
Set-ExecutionPolicy Unrestricted
CMD-PROMPT (not powershell) — as ADMINISTRATOR with admin-rights!
f:\setup.exe /PrepareSchema /IAcceptExchangeServerLicenseTerms
f:\setup.exe /PrepareAD /IAcceptExchangeServerLicenseTerms
f:\setup.exe /PrepareDomain /IAcceptExchangeServerLicenseTerms
f:\Setup.exe /IAcceptExchangeServerLicenseTerms /Mode:Upgrade
Install Windows-Updates
Powershell with admin-rightscd C:\Windows\System32\de-DE
Set-MpPreference -DisableRealtimeMonitoring $true
cscript.exe .\WUA_SearchDownloadInstall.vbs
here are the ISOs
https://download.microsoft.com/download/f/4/e/f4e4b3a0-925b-4eff-8cc7-8b5932d75b49/ExchangeServer2016-x64-cu14.iso
https://download.microsoft.com/download/5/6/6/566de1bf-336a-4662-841c-98ef4e2c30bf/ExchangeServer2016-x64-CU15.ISO