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"An unknown error has occurred" error message in Outlook

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.

In Microsoft Outlook, you may receive one of the following error messages when you try to read, send, receive, or delete an email message. 

Error message 1
An unknown error has occurred. 0x80040119
Error message 2
An unknown error has occurred. 0x80040600
Or, when you try to delete email messages, you may receive the following error message: 
Messaging interface has caused an unknown error
The error may be caused by a corrupted Outlook Data File (*.pst) in the Outlook profile.  

To repair the corrupted file, follow these steps.

Step 1: Locate the default *.pst file that is using the Outlook profile

  1. In Control Panel, open the Mail the item.
  2. Click Show Profiles. Select the Outlook profile that experiences the issue, and then click Properties.
  3. Click Data files.
  4. Make a note of the location of the default *.pst file. The name of the default *.pst file contains a black circle with a check mark.

    The sceenshot about default pst profile

Step 2: Run the Outlook Inbox Repair Tool (SCANPST.exe) to repair the *.pst file

  1. Exit Outlook.
  2. Open the Outlook Inbox Repair Tool (SCANPST.exe).
  3. In the Enter the name of the file you want to scan box, type the location of the *.pst file.
  4. Click Start.

Where to find the Outlook Inbox Repair Tool

Outlook 2013

32-bit version of Windows: C:\Program Files\Microsoft Office\Office15\
64-bit version of Windows: C:\Program Files (x86)\Microsoft Office\Office15\
64-bit Outlook: C:\Program Files\Microsoft Office\Office15\

Office 365 Home or Business, Outlook 2013 Click to Run

Any version of Windows: C:\Program Files\Microsoft Office 15\root\office15\

Outlook 2010

32-bit version of Windows: C:\Program Files\Microsoft Office\Office14\
64-bit version of Windows: C:\Program Files (x86)\Microsoft Office\Office14\
64-bit Outlook: C:\Program Files\Microsoft Office\Office14\

Outlook 2007

32-bit version of Windows: C:\Program Files\Microsoft Office\Office12\
64-bit version of Windows: C:\Program Files (x86)\Microsoft Office\Office12\
More information
If the methods that are described in the "Resolution" section don't resolve the problem, you can try creating a new Unicode .pst file, setting it as the default, and then importing the data from your older .pst file. For information about how to do this, see the "How to point Outlook to your new Personal Folders file" section of the following article in the Microsoft Knowledge Base:
291636 How to move your personal folders (.pst) file in Outlook

To import the original .pst file, it must be removed from the Outlook profile. When Outlook is running, right-click the name of the Outlook data file (.pst) that you want to remove from the Outlook Bar or Navigation Pane, and then click Close <name>. If the Close command is not available, you are probably trying to remove the default Outlook data file (.pst) that is used to save your new messages. The article that was referenced earlier provides the steps to change the .pst file that's used as the default delivery location.

After you remove the original .pst file from the profile, you can import the data into the new .pst file by following the steps in the "How to import .pst file data into Outlook" section of the following article in the Microsoft Knowledge Base:

287070 How to manage .pst files in Outlook 2007, in Outlook 2003, and in Outlook 2002

If you're using Outlook with Exchange Server, you might want to contact the Exchange Server administrator for help. You can also use the Microsoft Customer Support Services website to find other solutions. Some services that the Microsoft Customer Support Services website provides include the following:
  • Searchable Knowledge Base: Search technical support information and self-help tools for Microsoft products.
  • Solution Centers: View product-specific frequently asked questions and support highlights.
  • Other support options: Use the web to ask a question, to contact Microsoft Customer Support Services, or to provide feedback.
If you continue to have questions after you use these Microsoft websites or cannot find a solution on the Microsoft Support Services website, go to the Contact Microsoft website.

Article ID: 814441 - Last Review: 07/31/2015 17:08:00 - Revision: 30.0

Microsoft Outlook 2010, Microsoft Office Outlook 2007, Microsoft Office Outlook 2003, Microsoft Outlook 2002 Standard Edition, Microsoft Exchange Online

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