If you’re using Microsoft Outlook and see the error message [800CCC0E-0-0-560], Synchronizing your mailbox usually means Outlook is having trouble connecting to the mail server.

This often happens when using IMAP. Fortunately, this issue can be fixed by checking a few settings and making basic changes. This article will guide you through simple steps to solve this problem.

What Does the Error Mean?

The error appears in the Outlook Synchronization Log and looks something like this:


Synchronizing Mailbox '[email protected]'  
Error synchronizing folder  
[800CCC0E-0-0-560]

This error usually means there is a connection problem between Outlook and the mail server. It can happen because of incorrect mail settings, network issues, antivirus blocking Outlook, or a corrupted data file.

Steps to Fix the Error

1. Check Your Internet Connection

Make sure your internet is working correctly. A weak or unstable connection can stop Outlook from connecting to the server.

2. Restart Outlook and Your Computer

Sometimes, restarting the program or your computer can fix temporary issues.

3. Check Your Email Settings

Incorrect IMAP or SMTP settings are a common reason for this error. Check the Outlook settings to ensure they match what your email provider recommends.

IMAP (Incoming Mail) Settings:

  • Server: imap.yourdomain.com
  • Port: 993
  • Encryption: SSL

SMTP (Outgoing Mail) Settings:

  • Server: smtp.yourdomain.com
  • Port: 587 or 465
  • Encryption: TLS or SSL
  • Authentication: Enabled

If unsure, check with your email hosting provider for the correct settings.

4. Temporarily Turn Off Antivirus or Firewall

Your security software might be blocking Outlook’s connection. Try temporarily turning off your antivirus or firewall to see if that fixes the problem. If it does, you may need to add Outlook as an exception in your antivirus settings.

READ
How to Completely Disable New User Registration in WordPress (Even When "Anyone Can Register" Is Off)

5. Repair Outlook Data File

A damaged Outlook data file (PST or OST) can cause sync problems. You can fix it with Microsoft’s built-in repair tool:

  • Close Outlook
  • Find and run SCANPST.EXE (usually in the Microsoft Office installation folder)
  • Choose your Outlook data file and start the repair process

6. Remove and Re-Add the Email Account

If the error continues, remove the account from Outlook and add it again using the correct settings.

To do this:

  • Go to File > Account Settings > Account Settings
  • Select the email account and click Remove
  • Restart Outlook and re-add the account

7. Update Outlook

Make sure your Outlook is up to date. Go to File > Office Account > Update Options > Update Now.

Connection problems, wrong settings, or software interference often cause Outlook errors [800CCC0E-0-0-560]. Following the steps above can usually fix the issue quickly. If the problem remains, contacting your email hosting provider for more help is a good idea.