Wow I ran into this problem on my Windows XP machine iwth Outlook 2007 and had never seen it.

Found a simple fix. I just opened the run command (Start–>Run) and typed in outlook.exe  /resetnavpane

I hit enter and Outlook opened correctly

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  • 2 Responses to “Can not start Microsoft Office Outlook. Can not open the outlook window”
    1. Chris Barnes says:

      Hi
      I have just got this message after many months of successful use
      I am using MS Office Pro 2007
      Win 7 RC
      I have played all evening And thought I had success with a restore to 3 days back
      However I was requested to add a new profile which I did
      Now I find I have lost all my callender and contract entries can these be retrieved These are extensive and valuable can you offer any help

      Thanks Chris

    2. henry says:

      Start — Run I typed in box outlook.exe /resetnavpane then clicked OK for Vista Home Preminum and appears : Microsoft Outlook Cannot start Microsoft Outlook The command line argument is not valid. Verify the switch you are using .
      Please help ! thanks, henry

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