Try changing -c to /c.

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Sue Mosher, Outlook MVP
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Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers
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> Microsoft OUTLOOK error message
> "The command line argument is not valid. Verify the switch you are using."
[quoted text clipped - 6 lines]
> Select edit
> "c:\Program Files\Microsoft Office\Office10\OUTLOOK.exe" -c IPM.NOTE \m
"%1"
> change the \m to /m the switch (\) is invalid.
> "c:\Program Files\Microsoft Office\Office10\OUTLOOK.exe" -c IPM.NOTE /m
"%1"
> But I can not get the switch to stay, it keeps reverting back to (\m) after reboot - this is the switch the error meassge is referring to.