Error message 0x800CCCC0E in outlook email

For 0x800CCC0E in classic Outlook, the fix depends on the account type.

If the affected account is Gmail or Yahoo in classic Outlook, Microsoft documented a known issue where Outlook stops prompting for sign-in and sync fails. The supported workaround is:

1. Close Outlook.
2. Open Credential Manager from the Windows Start menu.
3. Go to Manage your credentials > Windows Credentials.
4. Under Generic credentials, find entries starting with MicrosoftOffice16_Data:OAUTH2.
5. Expand them and identify the ones for the affected Gmail or Yahoo IMAP account.
6. Remove those matching MicrosoftOffice16_Data:OAUTH2 entries.
7. Restart Outlook and sign in again.
8. If sync does not start immediately, restart Outlook again.

If that does not fix Gmail or Yahoo sync, Microsoft also documents removing the matching identity key under:

Computer\HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Common\Identity\Identities

Warning: deleting registry keys is risky. Export or back up the key first so it can be restored if needed.

For IMAP or POP accounts that are not Gmail or Yahoo, Microsoft documents these checks for 0x800CCC0E / 0x800CCC0F connection errors:

1. In Outlook, go to File > Account Information.
2. Select the affected account.
3. Go to Account Settings > Server Settings.
4. Verify the incoming and outgoing server settings match the mail provider.
5. If the provider uses an App Password, create a new one in the provider’s webmail security settings and paste it into the Outlook password box.

If the account is IMAP/POP on Windows 10 and the connection started failing unexpectedly, Microsoft also documents a workaround involving TLS 1.3:

1. Open Regedit.
2. Go to: Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols
3. If TLS 1.3 exists there, export the configuration first as a backup.
4. Delete the TLS 1.3 key and its subkeys.
5. Restart Outlook. If needed, restart Windows.

Warning: registry changes can affect system connectivity and security settings. Back up the registry key before changing it.

Because the address shown is bigpond.com, the most relevant documented path is to first verify the IMAP/POP server settings and, if used, replace the App Password in Outlook.

References:

• I can't send or receive messages in Outlook
• Outlook IMAP or POP server unexpectedly terminated the connection, and the server was interrupted
• Users get errors 0x800CCC0E & 0x800CCC0F synchronizing Gmail and Yahoo accounts in classic Outlook