HOW TO FIX: 'Cannot start Microsoft Outlook. Outlook requires Microsoft Outlook Express 4.01 or greater...' error when trying to start Outlook XP (2002) after installing the Windows 10 Creators Fall update (version 1709) or April update (1803)
This error occurs because of two missing registry keys:
- HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{7790769C-0471-11d2-AF11-00C04FA35D02}
- HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{44BBA840-CC51-11CF-AAFA-00AA00B6015C}
The error can be fixed by exporting and importing the missing keys from a working system or downloading replacements from the following links:
- {7790769C-0471-11d2-AF11-00C04FA35D02} (Right click and click 'Save link as...')
- {44BBA840-CC51-11CF-AAFA-00AA00B6015C} (Right click and click 'Save link as...')
Once downloaded, double click the .reg file and proceed past the warnings by clicking 'Yes', 'Yes' and 'OK'.