I tried both these solutions and after restarting Outlook I was not asked to sign in again. I continue to get the error message that the mailbox cannot sync to the server.
Gmail no longer working in Outlook Classic since yesterday's Edge update. Icloud emails still work
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Joan North
15
Reputation points
Gmail account no longer works in Outlook Classic, yet my icloud account does. Get 0x800CCC0E error code. Internet is working fine. Can get gmail on my iphone but not my PC. This happened yesterday after Microsoft Edge update.
Outlook | Windows | Classic Outlook for Windows | For home
2 answers
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Alan Chafer 35 Reputation points2026-03-20T11:20:44.9133333+00:00 -
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Victor1-V 7,400 Reputation points Microsoft External Staff Moderator2026-03-20T13:27:42.8833333+00:00 Hi Alan Chafer,
If you’re experiencing the same issue as the original poster, this is a known issue that Microsoft is still working on. The workarounds shared earlier may help in some cases, but they don’t resolve the issue for everyone yet. Please follow this thread for updates in case a permanent fix becomes available.
If the workaround did not help in your case, the next step is to contact Microsoft Support directly so they can review your setup more closely. You can do that by following these steps:
- Visit the Microsoft Support contact page: Contact - Microsoft Support
- In the search bar, type “Outlook issue” and press Enter.
- Click the Get Help button.
- Scroll down and select Contact Support.
- When prompted, choose Other Products.
- For the category, select Outlook.
- Choose Chat with a support agent in your web browser.
- Confirm a personal email address you can access.
- Clearly explain the issue and mention that the mailbox is failing to sync after recent updates.
I understand how frustrating this can be, and I hope Support can help you move things forward.
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Victor1-V 7,400 Reputation points Microsoft External Staff Moderator
2026-03-17T06:46:09.39+00:00 Hi Joan North,
Welcome to Microsoft Q&A forum.
I understand how frustrating this is, especially when your Gmail account suddenly stops syncing in classic Outlook while it continues to work on your phone and through webmail.
Based on the error code 0x800CCC0E and the symptoms you described, this issue matches a known issue currently affecting Gmail (IMAP) accounts in classic Outlook for Windows. In this situation, Outlook may stop syncing because the stored sign‑in credentials are no longer refreshed, and Outlook does not prompt you to sign in again.
As a workaround, the Outlook team has published guidance that involves clearing the affected Gmail OAuth credentials from Windows so Outlook can prompt for a fresh sign‑in. Since the steps include working with Credential Manager (and, in some cases, the registry), it’s recommended to follow the official article carefully: https://support.microsoft.com/en-us/office/users-get-errors-0x800ccc0e-0x800ccc0f-synchronizing-gmail-and-yahoo-accounts-in-classic-outlook-e5a7b684-7c5c-4848-ab2d-d48291451f67
After completing the workaround steps in that article, restart Outlook and sign in again when prompted. Sync should resume once the credentials are refreshed.
Please try the steps outlined in the article and let me know how it goes.
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Victor1-V 7,400 Reputation points Microsoft External Staff Moderator
2026-03-18T11:25:45.1766667+00:00 Hi Joan North,
I hope you are doing well!
I'm following up to check if you've had a chance to look over my reply.
Please feel free let me know if you need any further assistance. I look forward to hearing back from you.
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Joan North 15 Reputation points
2026-03-20T10:33:44.86+00:00 Thank you for this advice. Stage one did not work so had to do the Redegit option and that finally worked. Many thanks. Peaceful night's sleep tonight, I think!
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Victor1-V 7,400 Reputation points Microsoft External Staff Moderator
2026-03-20T10:50:17.25+00:00 Hi Joan North,
Thanks for the update. I’m glad to hear that the Regedit option resolved the issue and that everything is now working as expected.
If you find this reply helpful, please consider marking it as the accepted answer and giving it an upvote. This will help other users who encounter the same issue find the solution more easily.
Have a great day!
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