If you use Microsoft Outlook 2010, Outlook 2007, Outlook 2003, or Outlook 2002 with Windows 7, with Windows Vista, or with Windows XP, you may receive one of the following error messages when you try to read, send, receive, or delete an email message: Error message 1
Error message 2
An unknown error has occurred.
An unknown error has occurred. 0x80040600
When you try to delete email messages, you may receive the following error message:
Messaging interface has caused an
You may be able to resolve this problem by using the Inbox Repair Tool to analyze and repair the .pst file. A .pst file is a personal-folders file that stores your email messages, contacts, notes, calendar items, and other data.
The steps to use the Inbox Repair Tool differ, depending on your computer’s operating system. Use the appropriate set of the following steps to resolve this problem.
If the .pst file is an ANSI-format PST and is larger than 2 gigabytes (GB), the Inbox Repair Tool (Scanpst.exe) does not work.
For more information about ANSI and Unicode formats for .pst files and about how to add a new Unicode PST to your Outlook profile, see the following article in the Microsoft Knowledge Base:
How to create a .pst file in Outlook 2003
For more information about ANSI and Unicode .pst file size limits, see the following article in the Microsoft Knowledge Base:
The .pst file has a different format and folder size limit in Outlook 2007 and in Outlook 2003
This article is intended for a beginning to intermediate computer user.
You may find it easier to follow the steps if you print this article first.