Microsoft Outlook Express – MSIMN

MSIMN.EXE is the executable for Microsoft Outlook Express versions 4, 5 and 6. This file should only appear in your task list when Outlook Express is running.

If you see MSIMN.EXE running after you exit Outlook Express or if you have multiple instances of the file in your task list, this may be due to your antivirus software. Click here for a workaround from Microsoft’s Knowledgebase.

It’s not uncommon to see Windows error messages involving MSIMN. Here are a few of the more common ones:
Error Message "MSIMN Performed an Illegal Operation" When Connecting to the Internet

Error Message: Msimn Has Caused an Error in Wsock32.dll

Msimn is not a valid Win32 Application.

Safe

Microsoft