Microsoft office 2003

You can use DBX Repair Kit. Outlook Express inbox.dbx repair tool fixing of DBX file corruption. DBX Repair Kit helps to repair DBX file of Outlook Express.

For more: http://www.dbx.repair/

Try using "System Restore", if the operating system on PC allows this functionality.
Using System Restore in Windows XP
Windows 7 System Restore
Using Windows 8 System Restore

When you start Outlook Express, the contents of your Inbox folder may be missing. The contents may be replaced with a new first-run "Welcome to Microsoft Outlook Express" message. You do not receive a warning that the email messages have been deleted, and the missing email messages are not in the Deleted Items folder.

If it doesn't help, look at the answer here: http://www.filerepairforum.com/forum/microsoft/microsoft-aa/outlook-express/906-outlook-express-emails-disappeared-can-i-get-them-back

Or:

Outlook Express Repair Kit. A power-packed Microsoft Outlook Express repair tool offering record efficiency, accuracy of recovery and full automation of the recovery process. A top choice for users who don't know how to repair Outlook Express 6.0 and above without handing their data to expensive and slow data recovery services.
For more information: http://www.outlookexpress.repair/

Hi,
If you cannot open the .dbx file, you need to have Outlook Express installed on your computer. Usually outlook Express is the default email client for Windows XP. http://www.dbxconverter.com/ you can try to use this link to get teh converter of .dbx files to .pst files that you can use and read using Microsoft Outlook (Third Party) or Windows Mail (default for Vista) Windows Live Mail(Windows 7).
Cheers!!

make sure about clear on "sub folder" in Inbox with respect to multiple-id's; and then think about routing that sub folder, since it reaching its starting point

Disconnect the network-cable from your computer, to block Internet access.

Start Outlook Express.
Instead of selecting the "Inbox" mail-folder,
select the "Outbox" folder.
Click once to select the E-mail message.
Use your mouse to "drag-and-drop" the message to your "Inbox" folder.
Close Outlook Express.
Reconnect the network-cable.
Open Outlook Express.
Check your "Inbox" for that "undeliverable" message.
Open the message, or delete the message.

Solution is posted in the Microsoft support site

The link is given below :

http://support.microsoft.com/kb/321505/en-us

If you dont want to open the link :

RESOLUTION

To resolve this issue, contact Network Associates for an upgrade to the latest version of VirusScan that is compatible with Outlook Express.

For more information about how to update your VirusScan software, visit the following McAfee Web site:

http://download.mcafee.com/updates/upgrade_patches.asp

Microsoft provides third-party contact information to help you find technical support. This contact information may change without notice. Microsoft does not guarantee the accuracy of this third-party contact information.

To recover the data from the Inbox.dbx file: •

Restore the Outlook Express store folder to its original location from your backup.

-or-

• View the Network Associates "Outlook Express Inbox Corruption" article that addresses this issue.

To view the article, visit the following Network Associates Web site:

http://www.mcafeehelp.com/displaydoc.asp?docid=60743&CategoryId=269

Note This article provides information about DBXtract. DBXtract is a recovery tool that you can use to restore corrupted Outlook Express e-mail folders. Other recovery utilites are also available.

For a complete list of the available tools, visit the following Web site:

http://www.windowsmarketplace.com/Results.aspx?collID=91


Good Luck.

Live, Love Laugh.

dear fando,

This is usually down to a corrupt or over-full email inbox. Outlook Express is not very good at holding large amounts of emails especially if they have large attachments. I had a user this morning with a 2.5 GB inbox.

Backup/rename Inbox (C:\Documents and Settings\(User)\Local Settings\Application Data\Identities\{GIU}\Microsoft\Outlook Express\inbox.dbx -> inboxbak.dbx).
Close Outlook Express.
Open Outlook Express.
Outlook Express will have created a whole new Inbox.
Your email should now work.

Best wishes.