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Decomissioning a single not anymore used Exchange Server 2013
About 1,5 years ago we moved all the email database to MS365 and since then used online the cloud solution. This was and is not a hybrid connection between the on-premises Exchange server and MS365. ...
After migrating all user mailboxes to the new Exchange server or Exchange Online, you can uninstall Exchange 2013 normally through the control panel, or run the PowerShell command .\Setup.exe/Mode:Uninstall. If the uninstallation fails, use Remove-ExchangeServer -Identity ServerName -Force to clean up the AD metadata, and then manually delete the remaining server objects under CN=Configuration in the ADSI Editor.