C: Users AppData Local Microsoft FORMS Note: Type your computer user name in the above location. If the above steps does not help, repair Office from control panel programs and features and verify the status. The Report Message and Report Phishing add-ins for Outlook and Outlook on the web (formerly known as Outlook Web App) enable people to easily report false positives (good email marked as bad) or false negatives (bad email allowed) to Microsoft and its affiliates for analysis.

Outlook Error 0x800CCC90 is a common error issue in the MS Outlook application. The section below will deal with some information regarding this error, its causes and initiative needed to be taken when such errors occur.

Error 0x800CCC90: (POP3) e-mail server has reported an internal error

In a few cases, configuration of more than one POP3 account in same profile can result into this error. This error occurs when you try to send or receive any email using MS Outlook application. Send-Receive Error report is generated with the following error message;

Receiving' reported error (0x800CCC90):'Your incoming (POP3) e-mail server has reported an internal error. If you continue to receive this message, contact your server administrator or Internet service provider (ISP).

What Are The Probable Reasons for Such Errors?

• Incorrect Credentials: Usage of false username and password can be a likely reason. Make sure that the password you are trying to put belongs to the same email account. If an Outlook application is unable to match the details, it will throw errors.
• Port Number Changed: An incorrect port number of Outgoing Server can also cause this error. There is also a possibility that your ISP has blocked the port which you were using. It can be figured out by changing the port.
• External Applications: In case you are using any firewall or antivirus recently, then it can also block email or other function. You can test it by temporarily minimize your security settings and try to send-receive the emails again.

How to Resolve Outlook Error 0x800CCC90?

In order to deal with this problem one can separate the POP3 accounts into smaller groups to make the Send/Receive process easier and effective. Once such groups are created, a user can connect with these groups separately. Follow the below stated steps to do the same;

See the Screenshots

Step 1

• Open Outlook application click 'Send/Receive', go to 'Send/Receive groups' and then select the Define Send/Receive Groups.

Step 2

• Another pop-up will open, click New and under 'Send/Receive Group Name' box give a name to the group.

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Step 3

• Under this new pop-up, choose the Accounts for which you want to create this group. You can choose more than one account as well and then select the 'Include account in this send/receive group' checkbox.

Step 4

• Select 'Send Mail Items' and 'Receive Mail Items' check box.

Step 5

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• Click 'Download complete item, including attachments' and click 'OK'.

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Step 6

• You can create many such groups for small groups of accounts and once done, click 'Close'.

Step 7

• Now to send or receive email for each group, go to Tools, point to Send/Receive and click the required name of the group.

Conclusion

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Creating different groups with specific accounts can not only put a stoppage to Outlook Error 0x800CCC90, it will also ease you to send receive procedure for specific accounts. In case the error still continues to display, then there are chances that other mentioned reasons are causing this error. Change in port numbers can help you to deal with this error as well. But if both of these workarounds fail to resolve your error issue, then it is suggested to take the help of professional third party software like Outlook PST Recovery. This can stop Outlook to show error and can provide you a smooth experience of emailing.