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How to troubleshoot Outlook Express or Microsoft Outlook Error (For different error codes)

Last updated on Sep 30,2024 |

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by s.clem

Introduction

This knowledge base article addresses common Outlook Express errors, such as authentication failures, server connection issues, and errors related to POP3 and SMTP protocols. It provides troubleshooting steps to help resolve these errors and restore email functionality. This guide is applicable for users experiencing issues with email connectivity and server responses, and it will walk you through the appropriate actions needed for resolution.

Error Codes and Solutions

0x800CCC00: LOAD SICILY FAILED – Authentication did not load

Close and restart Outlook Express.
If the error persists, wait 20-30 minutes for a server reset of your account and try again.
Possible user account corruption in Outlook Express. Set up a second identity to test if it works.

0x800CCC03: USER ALREADY CONNECTED

Ensure you are not logged in from another device. Close all connections and wait 20-30 minutes.
If your account is “Poplocked,” wait for it to time out or have someone stop the mail task on the server for UNIX accounts.
If neither applies, someone may be accessing your account, or there is an account-related issue.

0x800CCC05: NOT CONNECTED TO THE SERVER

Check if you can access web pages. If not, try reconnecting or rebooting your device.
Verify that the correct mail server is listed in your account settings.
If access is still unavailable, check DNS numbers or reinstall TCP/IP from Control Panel > Network.

0x800CCC0A: MESSAGE DOWNLOAD INCOMPLETE

Possible corruption of the pop3uidl file. Close your internet connection, find and delete the file.
Reboot and check mail again.
The error may be caused by a corrupt or large attachment. Large files or missing headers may trigger this issue.

0x800CCC0B: SERVER OR MAILDROP IS BUSY

Retry every 5 minutes to retrieve emails.
Ensure no other devices are logged in. If “Poplocked,” wait or stop the mail task on the server.
Check if someone else is downloading from your account.

0x800CCC0D: SERVER COULD NOT BE FOUND

Your firewall may be blocking access. Configure it to allow Msimn.exe (Outlook Express) and Outlook.exe (MS Outlook) and ensure outbound access to port 110 and inbound to ports 25/2525/587.
Disable any antivirus email scanning features.
If your ISP has blocked port 25, change the SMTP setting to port 2525/587.

0x800CCC0E: FAILED TO CONNECT – Cannot connect to server

Configure the firewall to allow Msimn.exe (Outlook Express) and Outlook.exe (MS Outlook) and ensure access to ports 110, 25, 2525, and 587.
Disable antivirus email scanning.
Switch SMTP to ports 2525/587 if port 25 is blocked by the ISP.

0x800CCC0F: CONNECTION DROPPED

Verify your internet connection by accessing random web pages.
Disable email scanning in your antivirus settings.

0x800CCC10: INVALID ADDRESS – Address not recognized by the server

Verify the spelling in the TO field.
Delete the message from the Outbox and resend it.

0x800CCC11: INVALID ADDRESS LIST – Mailing list not known by the server

Check the spelling of the mailing list.
Verify correct access to the list with the domain administrator.

0x800CCC16: INVALID ACCOUNT – User account not recognized

Double-check the spelling of the account name and re-enter the password.
Ensure that the mail server configuration is correct.

0x800CCC1A: SECURE CONNECT FAILED – Unable to connect using SSL

Turn off SSL in your email account properties and try again.

0x80042109: Outlook unable to connect to SMTP server

Ensure you can access the internet by loading random web pages.
Configure your firewall to allow Msimn.exe and Outlook.exe and ensure outbound access on port 110 and inbound access on ports 25/2525/587.
Disable antivirus email scanning if enabled.

POP3 Errors

0x800420CB: POP3 NO STORE – Mail cannot be stored on the server.
0x800CCC90: POP3 RESPONSE ERROR – Client response invalid.
0x800CCC91: POP3 INVALID USERNAME – Invalid username or username not found.
0x800CCC92: POP3 INVALID PASSWORD – Invalid password for the account.
0x800CCC93: POP3 PARSE FAILURE – Unable to interpret the response.
0x800CCC94: POP3 NEED STAT – STAT command required.
0x800CCC95: POP3 NO MESSAGES – No messages on the server.
0x800CCC96: POP3 NO MARKED MESSAGES – No messages marked for retrieval.
0x800CCC97: POP3 POPID OUT OF RANGE – Message ID out of range.

Solutions:

Verify that POP3 and SMTP server settings are correct.
Check for duplicate accounts and remove any duplicates.
Disable SSL connection.
Test POP3 service with telnet mail.domain.com 110.

SMTP Errors

0x800CCC60: Invalid response.
0x800CCC61: Unknown error code.
0x800CCC62: Syntax error.
0x800CCC63: Parameter syntax incorrect.
0x800CCC64: Command not implemented.
0x800CCC65: Improper command sequence.
0x800CCC66: Command not implemented.
0x800CCC67: Command not available.
0x800CCC68: Mailbox locked and busy.
0x800CCC69: Mailbox not found.
0x800CCC6A: Error processing request.
0x800CCC6B: User mailbox known but not on this server.
0x800CCC6C: No space to store messages.
0x800CCC6D: Storage limit exceeded.
0x800CCC6E: Invalid mailbox name syntax.
0x800CCC6F: Transaction failed.
0x800CCC78: Unknown sender (incorrect email address in the ‘Reply To’ field).
0x800CCC79: Server rejected recipients.
0x800CCC7A: No sender address specified.
0x800CCC7B: No recipients specified.