Outlook 0x800CCC0E / 0x800CCC0F with Gmail or Yahoo: Check OAuth Sign-In
Classic Outlook fails on Send/Receive with (0x800CCC0E) or (0x800CCC0F): “The connection to the server was interrupted” — typically on a Gmail or Yahoo account.
These codes do not prove a single cause. Microsoft’s incident beginning February 26, 2026 involved Outlook failing to prompt for refreshed OAuth credentials for some Gmail/Yahoo accounts. It was fixed in the service on March 20, 2026. It was not an announcement that the providers had just withdrawn basic authentication.
Fix 1: Update and check for a sign-in prompt
Update Outlook and confirm the provider’s web mailbox works. If syncing stopped after a password change without a new Outlook sign-in prompt, Microsoft says the OAuth token may take about one hour to expire. Complete the provider sign-in when prompted.
Fix 2: Refresh the affected OAuth credentials
For the matching missing-prompt symptom, Microsoft’s workaround preserves the mail account:
- Close Outlook and open Credential Manager → Windows Credentials → Generic credentials.
- Identify entries beginning MicrosoftOffice16_Data:OAUTH2 whose full names include tp_google_imap_Oauth2 or tp_yahoo_imap_Oauth2. Remove the matching provider/account entries, not unrelated credentials.
- Restart Outlook, complete Google/Yahoo sign-in, and restart once more if sync does not resume.
For multiple accounts or unclear entry names, use the account-mapping instructions in Microsoft’s incident page or ask IT. That page also gives an identity-key fallback; do not delete the whole identities tree or mail profile.
Fix 3: Diagnose other connection errors
If the symptom does not match that incident, check provider status, internet access, current Outlook support and the provider’s IMAP/SMTP settings. Prefer OAuth / Sign in with Google for Gmail; see Gmail setup for eligible app-password fallbacks. Do not remove/re-add an account or rebuild its cache until you have preserved local-only mail, contacts and calendars.
FAQ
It’s a Microsoft 365/Exchange account, not Gmail. Then it’s a different family — see Outlook keeps asking for your password and 0x8004010F data file error.
My password is definitely correct. A browser sign-in and Outlook’s saved token are different. Check the OAuth prompt and affected credentials before changing the password or rebuilding the account.
Sources: Microsoft Support — Errors 0x800CCC0E / 0x800CCC0F syncing Gmail and Yahoo in classic Outlook