Upgrade Exchange 2013 to CU21

First of all, snapshot your VM ! If your Exchange server is a physical one, that’s baaaad.

Reboot your server, it’s always nice to execute maintenance on a « clean » server.

Download and install Framework 4.7.1 and Visual C++ Redis blablabla (https://www.microsoft.com/en-US/download/details.aspx?id=40784).

Download (https://www.microsoft.com/en-us/download/details.aspx?id=57069) and unpack CU21 where you want

After that a new reboot is good no ?

Open CMD window with root privilege and go to where you unpacked your CU21 install files. Launch these commands :

setup.exe /PrepareSchema /IAcceptExchangeServerLicenseTerms





As you can see, installation checks the prerequisites





setup.exe /PrepareAD /IAcceptExchangeServerLicenseTerms





setup.exe /PrepareDomain /IAcceptExchangeServerLicenseTerms





setup /m:upgrade /IacceptExchangeServerLicenseTerms







If like me you faced this problem due to one process running : mscorsvw.exe

Just wait a few seconds/minutes for the process to finish itself and then launch again









At the end restart again your server and everything should be OK.

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