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You receive a "The command line argument is not valid" error message when you use the /unregserver command-line switch and the /regserver command-line switch in Outlook 2003

Support for Office 2003 has ended

Microsoft ended support for Office 2003 on April 8, 2014. This change has affected your software updates and security options. Learn what this means for you and how to stay protected.

SYMPTOMS
When you use the /unregserver command-line switch and the /regserver command-line switch, you may receive the following error message in Microsoft Office Outlook 2003:
Cannot start Microsoft Office Outlook. The command line argument is not valid. Verify the switch you are using.
CAUSE
This behavior occurs because both the /unregserver command-line switch and the /regserver command-line switch are no longer valid in Outlook 2003.
STATUS
This behavior is by design.
Outlook 2003
Properties

Article ID: 827593 - Last Review: 09/28/2004 22:54:01 - Revision: 1.3

  • Microsoft Office Outlook 2003
  • kbcommandline kbpending kberrmsg kbprb KB827593
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