Error 0x800420cb message could not be opened

You may get the following error message:

Message Could Not Be Opened From Outbox Folder, Account: MailAccount',Server:'', Protocol:SMTP,Port:25,Secure(SSL):No, Error Number:0x800420CB


The usual cause of this problem is a corrupted Outbox.dbx file. To fix it:

  • Click Tools
  • Select Accounts
  • Click the Mail tab
  • Choose a duplicate mail account, and then click Remove. Keep doing this until all duplicated accounts have been removed.
  • Click Close

Still having problems with this error message? Try renaming the Outbox.dbx file. Please note that this will permanently delete any messages still in the outbox.

  • Close Outlook Express
  • Right-click the Start button on your desktop
  • Click Find or Search
  • Search for the Outbox.dbx file
  • Right-click the file, click Delete, then click Yes
  • Start Outlook Express, then try again.