Remo Repair Help

What is 0x800CCC90 Error in Outlook 2010?

Microsoft Outlook is a very important application used to exchange emails in both offices and personal life. However, if there is any problem when you are trying to send or receive emails using MS Outlook, then you might get error number 0x800CCC90. After such error message, although you can send emails but you can’t receive them, the error notification looks something like this.

“There was a problem logging onto your mail server. Your Password was rejected. Account: '', Server: '', Protocol: POP3, Server Response: '-ERR Login failed.’ Port: 110, Secure(SSL): No, Server Error: 0x800CCC90, Error Number: 0x800CCC92.”

Error number 0x800CCC90 indicates Client response invalid and can occur due to number of reasons, here are the most common reason and some solution through which you can eliminate this error message.


The main reasons due to which this error message pops up is due to entering Account Name (or) Password incorrectly. To solve this issue follow the below steps:

Step 1: Launch Outlook Express

Step 2: Click on “Tools” --> “Accounts” --> then, “Mail” tab

Step 3: Select your corresponding account and click on “Properties” button

Step 4: Next, click on “Servers” Tab

  • 4a. under the section labeled “Incoming Mail Server” make sure that the account username has been entered within the text box labeled “Account Name:” in lowercase.
  • 4b. make sure that the correct password has been entered within the box labeled “Password:” in lowercase. And also ensure that “Remember Password” box has been ticked
  • 4c. finally, make sure that the following two boxes are not selected: “Log on using Secure Password Authentication” and “My server requires authentication”

Step 5: Click on “Apply” button and then “OK” button

This manual method will eliminate Outlook Error 0x800CCC90 easily, however sometimes error 0x800CCC90 occurs due to Outlook data file (PST) corruption or damage. In such cases it is recommended to use Remo Repair software to solve the problem.

Remo Repair Outlook is packed with many advanced and outstanding features which would help you to solve all errors associated with your MS Outlook application. The software uses advanced built in algorithm that automatically fixes Outlook errors and helps you to recover PST file attributes like emails, calendar entries, contacts, attachments, notes etc. Adding to this, the application repairs PST file created on all the latest Outlook versions like Microsoft Outlook 2000, 2003, 2007 and Outlook 2010.