Read time 2 minutes

Summary: Outlook Express may encounter errors such as 0x800420CB POP3 NO STORE. This article details solutions, including removing duplicate email accounts and using Kernel for Outlook Express for efficient DBX repair and recovery.

Outlook Express, a lightweight application distinct from Outlook, handles email messages and facilitates communication with friends and colleagues. While typically error-free, it can display error messages when issues arise. For example:

0x800420CB POP3 NO STORE – Mail cannot be stored on server

The error message above indicates that the email you’re trying to send cannot be stored on the mail server, resulting in Outlook Express being unable to process the email.


There can be following possible reasons for this error message:

  • Due to some internal problem in Outlook Express duplicate email accounts are created.
  • User mailbox has been damaged.


If you encounter the error message “0x800420CB POP3 NO STORE – Mail cannot be stored on the server,” the first step is to check Outlook Express for duplicate email accounts. Follow these steps to identify and resolve the issue if duplicate email accounts are found:

  1. Start Outlook Express.
  2. Select Accounts option in Tools menu. The Internet Accounts screen appears.
  3. Check if duplicate email accounts are there.
  4. Select the duplicate email account, if found and click the Remove button.
  5. Repeat the step 4 until all duplicate accounts are not removed.
  6. After deleting all duplicate accounts, click the Close button to go back on Outlook Express main window.

Following these steps should resolve the issue. However, if you do not find any duplicate email accounts, the error is likely due to user mailbox corruption. To address this problem and eliminate the error message, you will need to repair your user mailbox using a third-party DBX Recovery tool.

Kernel for Outlook Express is an exceptional, efficient, and speedy DBX repair and recovery software. This tool is designed to repair damaged DBX files and recover crucial emails, notes, contacts, and more. Additionally, it retains email formatting and properties to ensure you can use them without any alterations.

Kernel for Outlook Express Recovery