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0x800CCC00 LOAD SICILY FAILED – Authentication did not load.

1) Try closing and restarting Outlook express.
2) If you are still receiving the same error, wait 20-30 minutes for a server reset of your account and then try again.
3) It could be a corruption of the user account in Outlook Express, try setting up a second identity and see if it works.

0x800CCC03 USER ALREADY CONNECTED

1) You may be logged in through another machine. Close all the connections on all the machines and wait 20-30 minutes and try again.
2) Some mail servers will not recognize an improper connection. This will result in the account being ‘Poplocked’. Either wait 20-30 minutes for it to time out or get somebody to shell into the mail server and stop the mail task which is running on the account. This can normally be done with accounts that have UNIX shells.
3) If you are not logged in through another machine or Poplocked then someone may be using/downloading from your account or something is wrong with your account.

0x800CCC05 NOT CONNECTED TO THE SERVER

1) Can you get web pages? If so, you may have the wrong mail server typed in your account settings or the server may be down.
2) If you cannot get web pages then hang up and try connecting again.
3) Reboot the computer and try again.
4) If it’s still not working and you are not getting any web pages, then data may not be moving across the network properly. Check DNS numbers, remove and then reinstall TCP/IP in Control Panel > Network.

0x800CCC0A MESSAGE DOWNLOAD INCOMPLETE

1) This is a possible corruption of the pop3uidl file. Close the Internet connection and all the programs. Search for the file ‘pop3uidl’ and delete it. Reconnect and it should work.
2) Repeat step 1 with a reboot before you check your mail again.
3) You may have a corrupt or a very large file attachment on the mail server. Large file attachments, mails that are missing headers or mails which do not conform to the mail RFC’s can cause this.

0x800CCC0B SERVER OR MAILDROP IS BUSY

1) Try to retrieve e-mail about every 5 minutes. Alternatively, call your ISP help desk to make sure that the server hasn’t crashed.
2) You may be logged in through another machine. Close all connections on all the machines, wait 20-30 minutes and then try again.
3) Some mail servers will not recognize an improper connection. This will result in the account being ‘Poplocked’. Either wait 20-30 minutes for it to time out or get somebody to shell into the mail server and stop the mail task that is running on the account. This can normally only be done with accounts that have UNIX shells.
4) If you are not logged in through another machine or Poplocked then someone may be using/downloading from your account or something is wrong with your account.

0x800CCC0D SERVER COULD NOT BE FOUND

1) Firewall may be causing this error. Configure your firewall software to grant access to the Internet for Msimn.exe (Outlook Express) and Outlook.exe (MS Outlook) and also outbound access on port 110 and inbound access on port 25/2525/587.
2) You have enabled external antivirus email feature. Turn off or allow access for the antivirus email feature.
3) Your ISP has blocked port 25 for outgoing mail. This is becoming quite common, so we also provide outgoing mail service on port 587. If you have ruled out anti-virus or firewall interference, try changing your SMTP setting from port 25 to 2525/587.

0x800CCC0E FAILED TO CONNECT – Cannot connect to server

1) You have a firewall. The firewall may be causing this error. Configure your firewall software to grant access to the Internet for Msimn.exe (Outlook Express) and Outlook.exe (MS Outlook) and also outbound access on port 110 and inbound access on port 25/2525/587.
2) You have enabled external antivirus email feature. Turn off or allow access for the antivirus email feature.
3) Your ISP has blocked port 25 for outgoing mail. This is becoming quite common, so we also provide outgoing mail service on port 587. If you have ruled out anti-virus or firewall interference, try changing your SMTP setting from port 25 to 2525/587.

0x800CCC0F CONNECTION DROPPED

1) Verify internet connection by accessing random web pages.
2) Email scanning in any antivirus should be disabled.

0x800CCC10 INVALID ADDRESS – Address not known on server

Check the spelling in the TO: field of the e-mail. Delete the old message from the Outbox and then try it again.

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

1) Check the spellings of the mailing list and try it again.
2) Check with the domain administrator to see if you have the correct access to the list from the terminal you are using.

0x800CCC16 INVALID ACCOUNT – User account not recognised

1) Check the spelling of the account name and re-enter the password with the correct spelling.
2) Check the mail server configuration to make sure the correct mail server was inserted correctly.

0x800CCC1A SECURE CONNECT FAILED – Unable to connect using SSL

Turn off SSL in the e-mail account properties and try again.

0x80042109 – Outlook is unable to connect to your outgoing (SMTP) e-mail server…

1) Verify internet connection by accessing random web pages.
2) Firewall may be causing this error. Configure your firewall software to grant access to the Internet for Msimn.exe (Outlook Express) and Outlook.exe (MS Outlook) and also outbound access on port 110 and inbound access on port 25/2525/587.
3) You have enabled external antivirus email feature. Turn off or allow access for the antivirus email feature.

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 – Password not valid for 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

1) Check the Outlook Express Accounts for any duplicate email address and delete the duplicate.
2) Check your email settings, making sure that the POP3 and SMTP servers, and your full username and password are all correct.
3) Ensure that the mail server inserted is available and correct, eg. mail.domain.com.
4) Disable the SSL connection transfer.
5) Telnet mail.domainname.com 110 to check mail server pop3 service and port status.

SMTP Errors

0x800CCC60: Invalid response.
0x800CCC61: Unknown error code.
0x800CCC62: Syntax error returned.
0x800CCC63: Parameter syntax incorrect.
0x800CCC64: Command not implemented.
0x800CCC65: Improper command sequence.
0x800CCC66: Command not implemented.
0x800CCC67: Command not available.
0x800CCC68: Mailbox is locked and busy.
0x800CCC69: Mailbox not found.
0x800CCC6A: Error processing request.
0x800CCC6B: User mailbox is known, but mailbox 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 e-mail address in the ‘Reply To’ field).
0x800CCC79: Server rejected recipients.
0x800CCC7A: No sender address specified.
0x800CCC7B: No recipients specified.

1) Check your email settings, make sure your full username and password are all correct.
2) Ensure that the mail server inserted is available and correct, eg. mail.domain.com.
3) Disable the SSL connection transfer.
4) Telnet mail.domainname.com 2525 to check mail server SMTP service and port status.
5) Make sure the recipient is available and the address inserted correctly.

View link below for Outlook configuration

MsOutlook 2010:

https://www.ipserverone.info/email/how-to-setup-email-on-microsoft-outlook-2010

MsOutlook 2007:

https://www.ipserverone.info/email/how-to-setup-email-on-microsoft-outlook-2007

MsOutlookExpress:

https://www.ipserverone.info/email/how-to-setup-email-on-microsoft-outlook-express