Outlook express error - Outlook express could not open

Posted on 2006-05-30
Last Modified: 2010-04-08
Whe trying to open an .eml attachment or forward or reply to an email we get the following message...
outlook express could not be started.  the application was unable to open the outlook express message store.  your computer may be out of memory or your disk is full.  contact microsoft support for fut...

1/3 of the disk is full and its a 1/2 gig machine running only express
Question by:TheTechnicalDoctor
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    Expert Comment

    OLEXP: Error Message When You Start Outlook Express After Windows 2000 Service Pack 1 Installation
    View products that this article applies to.
    Article ID : 296969
    Last Review : October 2, 2002
    Revision : 1.0
    This article was previously published under Q296969
    For information about the differences between Microsoft Outlook and Microsoft Outlook Express e-mail clients, click the following article number to view the article in the Microsoft Knowledge Base:
    257824 ( OL2000: Differences Between Outlook and Outlook Express
    After you install Microsoft Windows 2000 Service Pack 1 (SP1), when you attempt to start Outlook Express, you may receive the following error message:
    Outlook Express could not be started. The application was unable to open the Outlook Express message store. Your computer may be out of memory or your disk is full. Contact Microsoft support for further assistance. (0x8007007E,126)
    That error message is followed by the following error message:
    Outlook Express could not be started because MSOE.DLL could not be initialized. Outlook Express may not be installed correctly.
     Back to the top

    This issue can occur if you have changed the ProgramFilesDir value in the following registry key to install programs on a different drive than the operating system:
    If you change this key before you install Windows 2000 SP1, Outlook Express no longer functions. A new, empty folder named Outlook Express is created in the folder that the ProgramFilesDir value points to; however, the program is still located in the C:\Program Files\Outlook Express folder. The shortcuts to start Outlook Express point to the empty folder.
     Back to the top

    To resolve this issue, modify your shortcuts to point to the correct location.
    LVL 97

    Expert Comment

    Greetings, TheTechnicalDoctor !

    Outlook Express opens attachment in your Temp folder.  Make sure your Temp folder and Temporary Internet Files folder are not full. Delete the files from these temp folders and test.

    Your email files could be corrupted. Here is how to repair the DBX files.

    Best wishes!
    LVL 97

    Expert Comment


    We have not heard from you. Did any comment help you solve your problem? Do you have any more question? If an Expert helped you, please accept his/her answer above with an excellent or good grade.

    Thanks, war1

    Author Comment

    Did not solve the problem.

    Any other thoughts
    LVL 97

    Accepted Solution


    1. A recent Outlook Express update, KB 911567, can cause the problem.  The only fix now is to uninstall it from Add/Remove Programs in Control Panel and disable Windows Autoupdate.

    2. Register an important Outlook file. Go to Start > Run and type regsvr32 OLE32.DLL

    3. Create a new Outlook Express identity.

    4. Repair or Reinstall Outlook Express.

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