The default mail client is not properly set
- Open a registry editor
- Go to HKLM\SOFTWARE\Classes\Mailto
- Set DefaultIcon to “C:\PROGRA~1\MICROS~2\<office_version>\OUTLOOK.EXE”,7
- Go to HKLM\SOFTWARE\Classes\Mailto\shell\open
- Set command to Change to “C:\PROGRA~1\MICROS~2\<office_version>\OUTLOOK.EXE” -c IPM.Note /m “%1”
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