Fixes / Outlook · Checked September 30, 2026

Outlook error 0x800CCC0E: what it means and how to fix it

Short answer

Error 0x800CCC0E means classic Outlook for Windows can't connect to your mail server, so it can't check for new mail or sync IMAP folders. For Gmail and Yahoo accounts the usual cause is an expired or rejected sign-in token, often after a password change. To fix it, delete the account's MicrosoftOffice16_Data:OAUTH2 entries in Windows Credential Manager, then restart Outlook and sign in again.

What this message means

0x800CCC0E is a connection error from classic Outlook for Windows. Outlook tried to reach the incoming (IMAP or POP) or outgoing (SMTP) server for one of your email accounts and failed to connect. It usually shows up as "Task 'you@example.com - Receiving' reported error (0x800CCC0E): 'Outlook cannot synchronize subscribed folders'" or as "Cannot connect to the server". Your emails are not lost. They are still on the server and in webmail. Outlook just can't get to them. Common causes are a sign-in token the server no longer accepts, wrong server names or ports, a network block, or a damaged Outlook profile.

Common causes

Cause	How to tell
Expired or rejected sign-in (OAuth) token for a Gmail, Google Workspace or Yahoo account	Webmail works and the account worked before, but now every send/receive fails with 0x800CCC0E, and sending may fail with 0x800CCC0F or 0x80070057. Outlook does not ask you to sign in again. This often starts after you change your password.
Google consent granted without full mail permission	The error started when you added or re-added a Gmail account, and on Google's sign-in page you did not tick "Read, compose, send, and permanently delete all your email from Gmail".
Wrong server names, ports or encryption settings (common with manually set up IMAP/POP accounts)	The account has never worked, or it stopped after your email host changed its settings. In account settings the incoming port is not 993 (IMAP, SSL/TLS) or 995 (POP, SSL/TLS), or the outgoing port is not 587 (STARTTLS) or 465 (SSL/TLS).
Outdated password saved in Outlook for a password-based account (iCloud, ISP or hosting mail)	You recently changed the password on the provider's website, or the provider requires an app-specific password (iCloud does), and Outlook is still using the old one.
Firewall, antivirus email scanning, VPN or network blocking the mail ports	Every account in Outlook fails at the same time, or the error goes away on a different network (for example a phone hotspot) or when you disconnect the VPN.
Damaged Outlook profile, data file or a faulty add-in	Server settings and password are correct and webmail works, but the error keeps coming back. It may stop when you start Outlook in Safe Mode.

How to fix it

1. Clear the saved Gmail/Yahoo sign-in token in Credential Manager

Classic Outlook for Windows (Microsoft 365, Outlook 2021/2024), Windows 10 and 11. For Gmail, Google Workspace and Yahoo accounts.

Close Outlook completely. Check that Outlook.exe is gone from Task Manager (Ctrl+Shift+Esc).
Click Start, type Credential Manager and open it (on Windows 10 it is also under Control Panel).
Select Windows Credentials, then scroll down to Generic Credentials.
Find the entries that start with MicrosoftOffice16_Data:OAUTH2 and belong to the failing account. For Gmail they contain tp_google_imap_Oauth2.
Expand each entry and click Remove. Remove all of the entries for that account.
Open Outlook. When it asks you to sign in, do so in the browser window that opens. For Gmail, tick the box for "Read, compose, send, and permanently delete all your email from Gmail".

2. Reset Google's access and re-add the Gmail account with full permission

Classic Outlook for Windows, Gmail and Google Workspace accounts. Needs Current Channel Version 2412 Build 18324.20168 or later (File > Office Account > About Outlook shows your version).

Close Outlook.
In a browser, sign in to your Google Account and go to Manage your Google Account > Security.
Under Your connections to third-party apps & services, select Microsoft apps & services, then See details > Remove all access > Confirm.
Delete the tp_google_imap_Oauth2 entries in Credential Manager as described in the previous fix.
Open Outlook. Select Sign in via browser on the yellow bar (or Retry on the error window), and tick the Gmail permission box before you finish signing in.

3. Update the saved password

IMAP/POP accounts that use a password (iCloud, ISP, web hosting mail). iCloud requires an app-specific password created at account.apple.com.

Sign in to your provider's webmail to confirm the password works. If you use iCloud, create a new app-specific password instead.
In Outlook, go to File > Account Settings > Account Settings.
Select the account on the Email tab and click Change (in newer builds, File > Account Settings > Server Settings).
Enter the new password in the Password field and save.
Press F9 (Send/Receive All Folders) to test.

4. Check the server names, ports and encryption

Manually configured IMAP/POP accounts. Gmail and Yahoo accounts added through browser sign-in manage these settings automatically.

Get the exact incoming and outgoing server names from your email provider's help page (for example imap.mail.me.com / smtp.mail.me.com for iCloud, imap.mail.yahoo.com / smtp.mail.yahoo.com for Yahoo).
In Outlook, go to File > Account Settings > Server Settings (older builds: Account Settings > Change > More Settings > Advanced).
Set incoming IMAP to port 993 with SSL/TLS, or POP to port 995 with SSL/TLS.
Set outgoing SMTP to port 587 with STARTTLS (or 465 with SSL/TLS if your provider says so), and make sure your outgoing server requires authentication.
Clear the Require logon using Secure Password Authentication (SPA) box unless your provider asks for it.
Save, then press F9 to test.

5. Rule out firewall, antivirus, VPN and add-ins

Classic Outlook for Windows

Disconnect any VPN and try Send/Receive (F9) again.
Turn off email scanning in your antivirus for a moment, test, then turn it back on. If that fixed it, add Outlook as an exception or turn off only the email scanning.
Press Windows+R, type outlook.exe /safe and press Enter to start Outlook without add-ins.
If mail syncs in Safe Mode, go to File > Options > Add-ins, choose COM Add-ins next to Manage, click Go, and turn add-ins off one at a time to find the one causing it.

6. Repair the account or rebuild the data file, then repair Office

Classic Outlook for Windows. On Windows 11 the Office repair is under Settings > Apps > Installed apps. On Windows 10 it is under Settings > Apps > Apps & features.

Go to File > Account Settings > Account Settings, select the account and click Repair if that option is there.
If it still fails, close Outlook and open %localappdata%\Microsoft\Outlook in File Explorer. Rename the account's .ost file to .old. Outlook downloads a fresh copy from the server the next time it opens. Do not rename .pst files, because those hold mail that exists only on your PC (POP accounts). Run SCANPST.EXE on them instead.
To repair Office, find Microsoft 365 in the installed apps list and choose Modify. Run Quick Repair first. If that does not help, run Online Repair.
Restart the PC and open Outlook again.

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Still not fixed?

Turn on logging to see the server's exact reply: go to File > Options > Advanced, tick Enable troubleshooting logging (requires restarting Outlook) under Other, restart Outlook, reproduce the error, and check %temp%\Outlook Logging. You can also remove the account and add it again, or create a new profile in Control Panel > Mail > Show Profiles. If webmail works but Outlook still can't connect, send the log to your email provider's support. For a work Microsoft 365 mailbox set up as IMAP/POP, ask your IT admin. Microsoft is turning off password (Basic) sign-in for those protocols, so the mailbox should be added as a normal Microsoft 365/Exchange account instead. New Outlook for Windows does not use this error code, so switching to it is another way around the problem for Gmail and Yahoo.

Questions people ask

What does 'Outlook cannot synchronize subscribed folders' with 0x800CCC0E mean?

Classic Outlook could not connect to your IMAP server to sync your folder list and new mail. Your mail is still safe on the server. The usual fix for Gmail and Yahoo is to clear the saved OAUTH2 sign-in in Credential Manager and sign in again.

Why did 0x800CCC0E start with my Gmail or Yahoo account in 2026?

From February 26, 2026, a Microsoft known issue caused OAuth sign-ins for Gmail and Yahoo to fail in classic Outlook without asking the user to sign in again. Microsoft fixed it on its servers on March 20, 2026. If you change your password now, the same symptoms can appear for about an hour until the old token expires. Clearing the Credential Manager entry fixes it right away.

Do I need to enable IMAP in Gmail?

No. Since January 2025, IMAP is always on in Gmail and the Enable IMAP setting has been removed. If Gmail fails, the cause is usually the sign-in or missing permission, not IMAP being off.

Will removing and re-adding the account delete my emails?

For IMAP accounts (Gmail, Yahoo, iCloud), no. The mail stays on the server and downloads again. For POP accounts, check where the .pst file is saved first, because POP mail may exist only on your PC.

Does 0x800CCC0E appear in new Outlook or Outlook for Mac?

It is a classic Outlook for Windows error code. New Outlook and Outlook for Mac show different messages for connection problems, but the same checks apply: password or sign-in, server settings and network.

Sources

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