Outlook Command Line Switches may be used to clear errors within Outlook caused by personalization settings or corruption.


To run Outlook with a command line switch, use the following steps:


Windows XP:

  1. Click Start.
  2. Click Run.
  3. Enter the following in the Run dialog box (with quotations):
    "c:\program files\microsoft office\office12\Outlook.exe" /Commandswitch
  4. Click OK.


Windows Vista/7:

  1. Click Start.
  2. Click All Programs.
  3. Click Accessories.
  4. Click Run.
  5. Enter the following in the Run dialog box (with quotations):
    "c:\program files\microsoft office\office12\Outlook.exe" /Commandswitch

    Note: For 64-bit Operating Systems, you will enter the following (with quotations):
    "c:\program files (x86)\microsoft office\office12\Outlook.exe" /Commandswitch
  6. Click OK.


Recommended command switches:

/checkclient Prompts to make Outlook the default application for email, news, and contacts.
/cleancategories Deletes any custom category names that you have created, and restores all categories to their default names.
/cleanclientrules Starts Outlook and deletes client-based rules.
/cleanfreebusy Clears and regenerates the free/busy information on the Exchange server. This switch affects Outlook and OWA data, and can only be used when connected to Exchange.
/cleanprofile Checks for invalid registry keys and recreates the default keys where applicable.
/cleanreminders Clears and regenerates schedule reminders.
/cleanrules Starts Outlook and deletes all client-based and server-based rules.
/cleanserverrules Starts Outlook and deletes server-based rules.
/cleansharing Removes all RSS, Internet Calendar, and SharePoint subscriptions, but leaves all previously downloaded content on your computer.
/cleansniff Deletes duplicate reminder messages.
/cleanviews Removes all custom views and restores default views.
/firstrun Starts Outlook as if it were being run the first time.
/noextensions Starts Outlook with extensions turned off, but still viewable in the Add-in Manager.
/nopreview Starts Outlook with the Reading Pane turned off.
/profiles Open the Choose Profile dialog box.
/resetfolders Restores missing folders for the default delivery location.
/resetnavpane Clears and regenerates the Navigation Pane.
/resetsharedfolders Removes all shared folders from the Navigation Pane.
/safe Starts Outlook with all extensions turned off and without Reading Pane or toolbar customizations.