As we become more dependent on email as a primary method of communication in both our professional and business life, errors can be especially annoying and possibly serious when it affects out livelihood. The table below lists to common error codes and the various methods of fixing the errors after that. I recommend you start repairs by performing each of the solution in order to get the best results. I’ve listed them from the easiest to the most difficult.
Common Errors
| Error 0x800ccc91 | (POP3 username invalid) |
| Error 0x800ccc92 | (POP3 password invalid) |
| Error 0x800ccc7d | (Server does not support SSL) |
| Error 0x800420cb | Message could not be opened |
| Error 800ccc0131 | MSIMN Errors |
| Kernel Errors | Messages involving kernel32.dll |
| Wininet Errors | Messages involving wininet.dll |
| MSOE Errors | Messages involving msoe.dll |
| Riched Errors | Messages involving riched32 |
| Errors 0x800ccc0d & 0x800ccc0e |
(Can’t find Host – cannot Locate Server and Failed to Connect – Cannot Connect to Server) |
| Error 0x800ccc0f | (Connection dropped (DUN connection disconnected) |
| Error 0x800ccc79 | (SMTP rejected recipients (sending email to invalid email address) |
| Error 0x800ccc90 | (POP3 response error – Client Response invalid) |
| Problems opening attachments | |
| Messages lost if you are running Windows XP | |
| Can’t start Outlook Express | |
| Other problems sending messages | |
| Authentication Problems | |
| http://www.plus.net/support/email/email_troubleshooting/oe_error_guide.shtml for excruitating detail | |
Here are some basic steps to repair any of the errors listed above for Outlook Express:
Reboot the computer – this can fix any problems that are being caused by improperly closed files, memory data corruption and damage to system files.
Close other programs – close everything except internet explorer and outlook express so you don’t cause problem in any of your open programs while attempting to repair outlook express.
Delete Temporary internet files – In internet explorer
- Select Internet Option from the Tools menu
- Then in the temporary internet files panel, select Delete files.
- In the pop up window check Delete all offline files
- Click OK

You need to delete the temporary files because every time you view anything in outlook it creates a temporary file to display the contents of the message. If this multitude, it can grow to a rather large number fairly quickly) of temporary files gets damaged strange things can happen in outlook express.
Compact your folders – on the file menu select Folder -> Compact all Folders. Then go for a walk. Do not use your computer until the compacting process is complete. You should compact your folders periodically to prevent common problems.

Registry fix- sometimes registry corruption prevents outlook express from being recognized as the default email client. To fix this problem perform the following steps:
- Click Start -> Run and type msimn /reg
- Click OK. Nothing appears to happen.
- Select Tools -> Options in internet explorer
- On the programs tab select outlook express as the default email client
Library Fix – sometimes there can be problems in one or more of the dynamic link libraries that outlook express routinely used. The easiest way to be sure all of the libraries ae working properly is to re-register them using regsvr32. Perform the folloing steps:
- Go to Start -> run
- Type regsrv32 urlmon.dll and click OK
- Type regsrv32 mshtml.dll and click OK
- Type regsrv32 shdocvw.dll and click OK
- Type regsrv32 browseui.dll and click OK
- Type regsrv32 msjava.dll and click OK
Create a new identity – if nothing else we done works, try this. Creating a new identity will create a new message store folder and all new registry keys which should correct the problems you are experiencing. To create a new identity, perform the following steps:
- Select Tools -> Accounts
- Select the Mail tab and select the default account
- Select Export and give the file a name. Make sure the extension is .iaf
- Repeat steps 2 and 3 for all existing email accounts
- Do the same for all news accounts
- When finished, select Close
- On the File menu select Identities
- Click on Add New Identity
- Type in a name for the new identity as shown below

- Click yes to switch to the new identity
- Select Cancel to close the wizard and select Cancel if any other windows pop up
- Next, select Tools -> Accounts
- Select import and start importing the .iaf files you created one at a time until you have imported all of them
- Next, select File -> Import -> Messages
- Highlight Microsoft Outlook Express 6 on the list
- Select Next
- Select the name of your old identity and then click OK
Last Resort – reinstall outlook express. Go to the Microsoft website and download the guide to reinstall and repair both internet explorer and outlook express. There are also several good third party tools available to repair outlook express.
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