The error 0x800CCC0E on a single Gmail IMAP account in classic Outlook after an Office update matches a known Gmail/Outlook issue.
For classic Outlook with Gmail, the update likely changed how Outlook authenticates to Gmail. When adding or using a Gmail account, Outlook must have permission to "Read, compose, send, and permanently delete all your email from Gmail" during the browser sign-in flow. If that box was not checked for this specific Gmail account, Outlook can no longer connect and shows errors like 0x800CCC0E and “cannot connect to the server.”
Resolution steps:
- Confirm Outlook build
- Make sure classic Outlook is on a build that includes the Gmail fix: Current Channel Version 2412 Build 18324.20168 or later. For how to check, see About Office: What version of Office am I using? (linked from the referenced article).
- Use the Retry sign-in for the failing Gmail account
- When the error appears for that Gmail account, use the Retry link in the error window.
- This reopens the browser sign-in for that specific Gmail account.
- During sign-in, ensure the permission box is checked for:
- “Read, compose, send, and permanently delete all your email from Gmail.”
- Complete the sign-in. Outlook should then be able to connect to the IMAP server again for that account.
- If Retry does not work
- If on the fixed build and Retry still fails, follow the manual workaround described in the same guidance (for example, removing and re-adding the Gmail account with the correct permission selected, or following any additional steps provided there).
Because the second Gmail account works, the issue is almost certainly with the consent/permissions for only the failing Gmail account rather than the ISP.
If, after correcting the Gmail consent, the error 0x800CCC0E persists, use the general classic Outlook connectivity troubleshooting for that account (server name, ports, SSL, etc.) as described under the broader “I can't send or receive messages in Outlook” guidance, but the Gmail consent fix should be tried first.
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