Outlook has stopped syncing with my computer

Question

I have tried to manually sync only the inbox and that didn't work either. I am to the point where I need someone to assist me.

Answer 1

Dear @Kullen Birkeland,

I understand that you’re experiencing issues syncing with Outlook, and I recognize how disruptive this can be. As a forum moderator, I genuinely wish I could directly access your account or delve into the backend systems to diagnose and fix this for you. However, our role here is limited to providing general guidance and solutions that can be applied by users.  

To better understand the situation, could you please share a few additional details?

• Are you using classic Outlook or the new Outlook experience?
• Are you seeing any specific error messages, such as 0x800CCC0E or 0x800CCC0F?
• Is anyone else in your organization encountering the same issue, or does it appear to affect only your account? Lastly, does the problem occur on a PC, Mac, or mobile device, or across multiple devices?

For your information, if you’re experiencing sync issues on a PC using classic Outlook, your situation may be similar to what some other users have recently reported. This issue is currently under investigation by Microsoft in certain environments. You can refer to the following Microsoft Support article for details: Users get errors 0x800CCC0E & 0x800CCC0F synchronizing Gmail and Yahoo accounts in classic Outlook

At the moment, you may try the following workaround steps, which have helped some users in similar situations:

Important: The steps below involve editing the Windows Registry. Please proceed carefully, and consider backing up the registry or creating a restore point before making changes.

1. Right click the Windows Start Button, select Run, type Regedit and select OK.
2. Paste the path below in the Regedit Address Bar and press Enter. Computer\HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Common\Identity\Identities
3. Under the Identities key, select each sub key until you find the one that matches the email address that is not syncing.
4. Delete the Identities registry key, example in red below. Look for the corresponding Gmail or Yahoo email address, example in purple. That is the identity key in the left column to delete. After you delete the key, restart Outlook and sign in again.

I hope this workaround helps. Please try the steps above and let me know how it goes. Since this forum does not have access to your mailbox or server configuration, we can only provide guidance based on official documentation and community reports.

If Microsoft releases a confirmed fix or update, I’ll be happy to share it here. Please let me know if you need anything else. Have a wonderful day.

---

If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".  

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread. 

Answer 2

Follow these steps to troubleshoot Outlook not syncing with the computer:

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 network issue first using the guidance in Fix network connection issues in Windows.
2. Manually trigger a sync in Outlook
   • In classic Outlook for Windows, go to the View tab on the Ribbon.
   • Select the Sync button.
   • Watch the status bar at the bottom of the message list to confirm that Outlook is syncing.
   • Note: This manual Sync button does not apply to third‑party POP/IMAP accounts such as Gmail, Yahoo, iCloud, or generic POP/IMAP.
3. If the issue is between Outlook and a mobile device
   • If the problem is that changes on a phone/tablet are not syncing with Outlook:
     1. Sign in to Outlook on the web.
     2. Go to Settings > General > Mobile devices.
     3. Select the affected device and delete the device partnership.
     4. Select Save.
     5. Power off the mobile device completely.
     6. Turn it back on and let it sync the mailbox again.
4. If sync still fails
   • Use the in‑product help channel:
     • In Outlook.com or Outlook on the web, select Help on the menu bar, describe the sync problem, then scroll to Still need help? and choose Yes to reach support.
   • For persistent Outlook client issues after these steps, contact support via the Outlook.com or Microsoft 365 help flows referenced below so an agent can review the specific mailbox and configuration.

---

References:

• I can't send or receive messages in Outlook
• Fix email sync issues by removing a device from your Outlook mailbox
• Outlook.com contact folders not syncing