Cannot sync yahoo email to Outlook error code800CCC0E-0-0-733

Question

Suddenly after several years, I cannot retrieve or send Yahoo email in Outlook. I get error code 800CCC0E-0-0-733. When I test the connection in Windows email - it works fine. I have uninstalled and reinstalled Microsoft Office 365, I have deleted the email and reset it up in Windows, but the I continue to get the same error. The email functions correctly on my phone and web based interfaces, but not to Outlook.

Answer 1

Hello

Many users seem to have this issue recently. Microsoft is still investigating this issue. The current workaround is published here: https://support.microsoft.com/office/users-get-errors-0x800ccc0e-0x800ccc0f-synchronizing-gmail-and-yahoo-accounts-in-classic-outlook-e5a7b684-7c5c-4848-ab2d-d48291451f67

Answer 2

Follow these steps in classic Outlook to troubleshoot Yahoo sync failures like error 800CCC0E-0-0-733:

1. Confirm internet connectivity
   • Open a browser (for example, Microsoft Edge or Google Chrome).
   • Browse to http://www.microsoft.com or http://www.bing.com.
   • If these sites do not load, resolve the Windows network issue first by following Fix network connection issues in Windows.
2. Check for general Outlook send/receive issues
   • In classic Outlook, verify whether other accounts (if any) can send/receive.
   • If nothing sends or receives, follow the classic Outlook steps from the “I can't send or receive messages in Outlook” guidance:
     • Make sure the password in Outlook matches the Yahoo account password or app password.
     • If the Yahoo password was changed recently on the web, update it in Outlook as well.
3. Verify password / app password for Yahoo
   • If Yahoo uses two-step verification or app passwords, Outlook must use the Yahoo app password instead of the normal sign-in password.
   • When Outlook prompts for a password, paste the Yahoo app password there.
   • If Outlook shows a message like “Please create an app password for Outlook on your email provider's site,” follow Yahoo’s instructions to generate that app password, then re-enter it in Outlook.
4. Check for sync issues and force a manual sync
   • In Outlook, go to the View tab and select the Sync button to force a manual send/receive.
   • Watch the status bar at the bottom of the Outlook window for any sync messages or errors.
   • For more detail on manual sync, see Sync to manually check for new mail and to send messages in Outlook.
5. Check antivirus email scanning
   • Some antivirus products scan email and can block connections after they detect a problem.
   • Temporarily disable email scanning in the antivirus (not the entire antivirus, if possible) and test Outlook again.
   • If email works after disabling scanning, consult the antivirus vendor’s help desk for a permanent configuration that allows Outlook to connect.
6. Repair Outlook and the Outlook profile
   • Repair Office/Outlook:
     • Use the Office repair process described in Repair an Office application.
   • Repair or recreate the Outlook profile:
     • Follow Fix your Outlook email connection by repairing your profile to repair the existing profile.
     • If issues persist, create a new Outlook profile and re-add the Yahoo account.
7. Start Outlook in safe mode to rule out add-ins
   • Press the Windows key, type outlook.exe /safe, and press Enter.
   • Test send/receive with Yahoo in safe mode.
   • If it works in safe mode, an add-in is likely causing the problem. Disable add-ins and test again; if needed, keep using a fresh profile as recommended in Create an Outlook profile.

If the Yahoo account continues to work on the web and on the phone but not in Outlook after these steps, focus on the Outlook profile (step 6) and add-ins (step 7), as those are the most common Outlook-side causes once connectivity and credentials are confirmed.

---

References:

• I can't send or receive messages in Outlook
• Outlook IMAP or POP server unexpectedly terminated the connection, and the server was interrupted
• Connection to Microsoft Exchange is unavailable error when a Microsoft 365 user tries to set up Outlook
• Can't send or receive email in Outlook.com
• Yahoo Account No Longer Syncing to Outlook - Microsoft Q&A
• Why am I not able to receive emails which I used to on my outlook mac. I can send emails without any issues. - Microsoft Q&A
• Class outlook is not working properly after Windows 11 version 25H2 update - Microsoft Q&A
• I am unable to share my file either as a presentation or document type or pdf type by none of the microsoft office apps (Word, Excel, Powerpoint). It is continuously showing "Mapi Failure" and "Unable to Share" errors. What can I do? - Microsoft Q&A
• Outlook keeps crashing - Microsoft Q&A

AI-generated content may be incorrect. Read our transparency notes for more information.