Cannot Start Microsoft Outlook
I have Windows 8.1. I get the following message: "Cannot Start Microsoft Outlook.  Cannot open the Outlook Window.  The set of folders cannot be opened.  the file C:\Users\David\AppData\Local\Microsoft\Outlook\***@outlook.com.ost cannot be opened."  *** is inserted in this body solely for security reasons.
March 21st, 2015 4:23pm

Hi,

This issue can occur if the Navigation Pane settings file becomes corrupted. We can try reset the file by starting Outlook using the /resetnavpane command-line switch. To do this, press Windows key + R to open the Run command, type outlook /resenavpane and press Enter.

Please let me know the result.

Regards,

Steve Fan
TechNet Community Support

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March 23rd, 2015 10:53am

The funny thing is a week later I was able to open Outlook (I had moved the .ost file to another folder).  But it would not download from the server.  So I moved my old .ost back to the proper folder and it started downloading from the server again.  In the meantime, I have a few weeks of emails on my Thunderbird.  Since Outlook synchronizes to the server, I'm fine.
April 4th, 2015 2:18am

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