The error 0x800CCC0E in Microsoft Outlook occurs when the email client fails to synchronize subscribed folders with the mail server. This is often caused by incorrect email settings, network connectivity problems, or interference from antivirus or firewall software.

In this guide, we list the steps to troubleshoot and resolve the issue so you can get your Outlook back to syncing properly.

*Note: Before attempting any fixes, we strongly recommend backing up your existing Outlook data file.

Outlook needs an active internet connection to communicate with your mail server. A disconnected or unstable network can trigger this error.

What to do:
- Open a browser and try visiting any website to confirm connectivity.
- Log in to your webmail to verify the server is accessible.
- Restart your router or switch to another network if needed.

Ensure the correct server names, ports, and encryption methods are used in your email account settings.

What to do:
- Check your Outlook IMAP settings

Security software may block Outlook's connection; disabling it temporarily can help identify the issue.

Corrupted Outlook data files can cause sync failures.
Use the built-in Inbox Repair Tool (scanpst.exe) to scan and repair your Outlook data file (.pst or .ost).

A corrupt Outlook profile can trigger sync errors.
Try creating a new profile to start fresh with clean settings.

If the issue persists, it is possible that the Outlook program files may be damaged.
Consider running a Quick Repair or Online Repair through your system’s app settings to restore functionality.