Methods to Perform Msimn.exe Repair

Msimn.exe is the Microsoft Outlook Express executable file. Outlook Express is the default POP3 email program that is shipped with your Windows computer.

Discussed here are some common msimn.exe errors and their resolution methods.

Error Message:

Microsoft Outlook Express has encountered a problem and needs to close. We are sorry for the inconvenience.
To see what data this error report contains, click here.

When you choose to display the error report, you may view an error signature similar to the one give below:

Application name Application version Module name Module version Offset ---------------------------------------------------------------------------- Msimn.exe 6.0.2800.1106 hungapp 00000000

When you launch the Outlook Express 6.0 application on your Windows computer, the application may stop responding or close unexpectedly. Additionally, the error message above is displayed on the screen.

Cause of the Error

This error usually occurs if mail usage in Outlook Express 6.0 is heavy.

Resolution Method

To resolve this problem, you need to obtain and install the Windows XP update package-KB900930. To download this package, click here.

Error Message:

Msimn.exe has generated errors and will be closed by Windows. You will need to restart the program. An error log is being created."

Error Message:

MSIMN caused an invalid page fault in module MSOE.DLL.

These error messages may display when you try to launch the Outlook Express application on your computer.

Cause of the Error

This error occurs when:

  • The .DBX files are marked as read only. DBX files are used to store e-mail messages of a particular Outlook Express Message folder.
  • Identities key that is added in the Windows Registry is damaged.

Resolution Method

Step 1: Backup your Outlook Express Address Book and E-mail messages. To do this, in the Outlook Express window, open File menu and then select the Export command. Next, choose the Address Book or Messages and then follow the screen instructions to make respective backups.

Step 2: Ensure that the .DBX files are not marked as read only.

Note: Quite often, when you copy .DBX files from a CD, they are copied as read only files.

To do this, perform the following steps:

  1. In the Start menu, select Search, and then select All Files and Folders.
  2. Next, in the All or part of the file name field type .dbx and then select options to search all drives on your hard disk.
  3. Click Search.
  4. After the results are displayed, note the location of the files from the In Folder column in the right-pane.
  5. Next, navigate to this location in Windows Explorer.
  6. Right-click the first DBX file and select Properties.
  7. If the Read-only check box is selected, clear it.
  8. Repeat steps, 6 and 7 to clear Read-only check boxes of all .DBX files.

Step 3: Regenerate Identities Key in the Registry

Warning: The steps discussed below require you to make changes in the registry. If you incorrectly edit the registry, it can cause serious problems on your system. Therefore, it is recommended that you backup the registry before proceeding with the edits. You can back up the registry either by using the Export command in the Registry Editor’s File menu or by using the Backup and Restore feature of a reliable registry cleaner tool.

  1. Open Start menu, select Run, type regedit and then press Enter to open the Registry Editor window.
  2. Navigate to the following registry key:


  1. Right-click the Identities key and the select the Delete command.
  2. Restart Outlook Express to ensure it opens normally.
  3. Restore your account setting, e-mail message, and addresses.

Note: If there are multiple Identities on your system, expand the Identities key. Multiple GUIDs (similar to {B53D2A63-9C36-4DDD-817F-E77B82AFEA8E}) will display. To see which GUID belongs to which Identity, select a GUID and then in the right-pane check the data for the “User Name” value.