An unknown error in Outlook Express accompanied by error number 0x800C0133 may be caused by a corrupt inbox file. Forcing Outlook Express to create a new Inbox will usually fix this error. Follow the steps below to back up your old inbox and force Outlook Express to create a new one.

Before we get started, we need to make sure your computer allows you to see hidden files. Click on Start and select Control Panel.

Click on the Tools menu and select Folder Options.

Click on the View tab and select "Show hidden files and folders." Click Apply then click OK.

We'll need to create a place to save copies of your Inbox messages so old messages are not lost. Right-click on Local Folders and choose New Folder.

Name the new folder Backup Inbox or something similar then click OK.

Next, select all of the messages in your Inbox folder. To do this, hold down the Ctrl key and click on each individual message to select them, or hold down the Shift key and click on the first message then the last message to highlight all messages in the folder. Once all of your messages are highlighted, right-click and select Copy to Folder.

Verify that all of your Inbox messages have been copied to the Backup Inbox folder.

Click on the Tools menu and select Options.

Click on the Maintenance tab then click on Store Folder.

Highlight the entire store location with your mouse and press the Ctrl-C keys on your keyboard to copy the location.

Open Windows Explorer by going to Start, All Programs, Accessories, Windows Explorer.

Delete the address entered currently and press Ctrl-V to paste in the address of your Outlook Express store folder. Hit enter. You should see a list of .dbx files similar to the screenshot above.

In the example above, you can see Inbox.dbx and Backup Inbox.dbx are the exact same size, 907 KB. This is a good sign that all of the inbox messages have been backed up.

Close any open Outlook Express windows then select Inbox.dbx and delete the file.

Open Outlook Express. Outlook Express will create a fresh Inbox file when it is opened (it actually makes a new inbox.dbx). Your inbox will be completely empty. Try sending and receiving email again. If this has corrected the error message, then you can safely move messages from the Backup Inbox that you created earlier into your new Outlook Express Inbox.
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