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With Microsoft Outlook application it is common to face sending or receiving errors. Sometimes due to some internal error you become unable to utilize Windows Mail, Live Mail and Outlook Express normally. Outlook error 0x800ccc90 is such a common Outlook errors generally prompts while accessing PST files or perform email tasks.

While checking your Outlook emails or trying to log on you will get below error code on the screen:

“There was a problem logging onto your mail server. Your User Name was rejected. Account: ‘’, Server: ‘’, Protocol: POP3, Server Response: ‘-ERR’, Port: 110, Secure(SSL): No, Server Error: 0x800CCC90.”

If you are getting same kind of error then it is necessary to fix this Outlook error as soon as possible. As you know that Windows Live Mail or Microsoft Outlook Express are special utilities of Windows to send or receive emails. Microsoft Outlook becomes more popular with the name of Email Client. Not only it helps to send or receive emails but it also allows you to manage emails. Getting outlook error 0x800ccc90 is irritating when you become unable to access saved PST items. Due to this error you become unable to access stored emails, contacts, calendar entries etc.

Most often POP3 server fails to verify your entered password and prompts Outlook express error 0x800ccc90 on the screen. As a result you are unable to connect to the server. Having this error code shows that Outlook is unable to access mailbox emails. For this behavior of Outlook virus or malware invasion might be responsible which cause problem with mail server. This error message might be dangerous for your Outlook application. Ignoring outlook error 0x800ccc90 may result system crash or blue screen of death error. So it is necessary to get rid of error code 0x800ccc90 quickly.

Outlook express error 0x800ccc90 generally caused due to problem in PO3 server connection. So in order to resolve this error first you should check or fix this connection. Follow steps might be helpful in this regard.

  • If you are using Outlook account then click on Tools tab and got to Select Accounts.
  • Internet Accounts box will appear. If you are able to see Outlook emails then double click.
  • Account property box should be opened. Go to Sever Tab.
  • should be written in the incoming mail dialog box.
  • And on Outgoing mail dialog box server name should be
  • Click on My Server Requires Authentication box and check it.
  • Click on Apply and close the window.
  • Restart Outlook and try to send to send emails now.

If you are still getting same Outlook error 0x800CCC90 after performing the above steps then it might be the cause of PST file corruption. Corrupted or damaged PST files may cause severe Outlook problems as well as results some system errors. So you need to repair PST files with proper PST scanning process.

Free scan your damaged files with PST repair tool. You can see the preview of the recoverable PST items with deep scanning of Outlook PST Repair tool. This tool is capable to recover deleted or lost PST files. It recovers Outlook emails, calendar entries, contacts, journals, notes etc. It is compatible with Outlook all versions like Outlook 2003, 2007 and 2010.

Related error code of 0x800CCC90:

Outlook error code 0x800CCC90

Outlook Express Server Error 0X800ccc90

Outlook Express Error Code 0X800ccc90

[Fixed] Outlook Error 0x800CCC90

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