Jan 20 2021 12:06 AM
Jan 26 2021 08:32 AM
Since you have deleted the exchange server on which upgrade had to be done. Now uninstallation will also not succeed properly since the actual server container in ADSIEDIT has been removed. Whether its installation or uninstallation the setup looks at the server container in ADSIEDIT and this server container is also replicated on all DCs.
So now you will have to do a manual exchange uninstallation. You can follow below article for manual exchange cleanup and then setup a new exchange install if you require.
Jan 27 2021 05:32 AM
I've deleted :
CN=Microsoft Exchange Autodiscover
Here I did not find an exchange server in groups and objects
CN=Default naming context,DC=DOMAIN,DC=LOCAL
CN=Microsoft Exchange Security Groups
CN=Microsoft Exchange Security Objects
in the registry all deleted (MSExchange*), directory removed
in IIS Manager all deleted
and again stopped installation at step 7 (as in the screengrab above)