How to resolve the Microsoft Outlook can not be started error that occurs when opening Outlook 2010

Original KB number:   2751236


When I open Outlook 2010, why do I see error messages such as Microsoft Outlook can not be started, cannot open the Outlook window, the set of folders cannot be opened, cannot access file, you do not have the permission required to access the file XXX or Cannot open your default e-mail folders. Cannot access file, you do not have the permission required to access the file XXX? How can I resolve this problem?

Screenshot of Outlook can't start error message.


  1. Select Start > Control Panel.

  2. Change View By to Large Icon, then select Mail.

    Screenshot of Control Panel window in Large icons view.

  3. Select Data File.

    Screenshot of the Mail Setup dialog box.

  4. Select the data file you're currently using, and then select Open file Location.

    Screenshot of the Open File location option of Data Files.

  5. Right-click on the data file, and select Properties.

    Screenshot of the properties option on the right-click menu of the PST file.

  6. Uncheck the Read-only box and select OK.

    Screenshot of the Read-only checkbox in the File Properties.

Now you can open your Outlook 2010 without problems.

Outlook reopens correctly.

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