When Outlook fails to launch with the below error message.
Open Registry editor from Start- Run. (Always backup the Registry before you make a change)
1.Check the Registry path
HKEY_LOCAL_MACHINE/Software/Microsoft/Internet Explorer and the correct version of IE was updated there.
2. Check the registry (Change if required) to the correct version
HKEY_LOCAL_MACHINE/Software/wow6432node/microsoft/internetexplorer
3. Enter the correct version and then launch Outlook close Registry edit and reopen Outlook. This issue should then be resolved.