Outlook error 0x800CCC0E: cannot synchronize subscribed folders (Gmail and Yahoo)

What causes it

Microsoft’s known-issue page lists these messages, all on Gmail or Yahoo accounts in classic Outlook for Microsoft 365:

• Synchronizing subscribed folders for [email protected]. reported error (0x800CCC0E)
• Check for new mail reported error (0x800CCC0E)
• Sending reported error (0x800CCC0F) or Sending reported error (0x80070057)

Gmail and Yahoo accounts in Outlook sign in with a token (OAuth) rather than storing your password. Microsoft says the problem was that Outlook didn’t ask you to sign in again when that token stopped working, so it kept trying with the stale one. It started on February 26, 2026, and Microsoft marked it fixed after a Microsoft 365 service change on March 20, 2026. That was a server-side fix, so there’s no Outlook update to install for it.

First: wait an hour after a password change

If the error began right after you changed your Gmail or Yahoo password, Microsoft says the old token can keep failing until it expires, which takes about an hour. After that, Outlook should ask you to sign in. If you can’t wait, or it’s been longer than that, use Fix 1.

Fix 1: Remove the saved sign-in from Credential Manager

1. Close Outlook completely.
2. Search for Credential Manager in the Start menu and open it, then select Windows Credentials.
3. Under Generic Credentials, look for entries that start with MicrosoftOffice16_Data:OAUTH2 and contain tp_google_imap_Oauth2 (Gmail) or tp_yahoo_imap_Oauth2 (Yahoo).
4. Expand each one and select Remove. Microsoft says there are usually two or four entries per account.
5. Open Outlook and sign in to the Gmail or Yahoo account when asked. If syncing doesn’t start, close and reopen Outlook once more.

If you have several Gmail or Yahoo accounts in Outlook and only one is broken, you can work out which entries belong to it. Each entry’s number matches a subkey under HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Common\Identity\Identities in Registry Editor, and that subkey shows the email address. If you remove the wrong ones, those accounts should simply ask you to sign in again.

Fix 2: Delete the account’s identity in the registry

Microsoft’s second workaround clears the account’s saved identity instead. Back up the key first by right-clicking it and choosing Export.

1. Close Outlook.
2. Press Win + R, type regedit and press Enter.
3. Go to HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Common\Identity\Identities.
4. Select each subkey and find the one whose values show the email address that isn’t syncing.
5. Delete only that subkey, not the whole Identities key, which holds your other accounts too.
6. Open Outlook and sign in again.

Fix 3: Check the account settings

If neither fix helps, the problem may not be the token. In classic Outlook, go to File > Account Settings > Account Settings, select the account and choose Repair or Change to review it. The standard IMAP settings are:

Account	Incoming (IMAP)	Outgoing (SMTP)
Gmail	imap.gmail.com, port 993, SSL/TLS	smtp.gmail.com, port 465 SSL/TLS or 587 STARTTLS
Yahoo	imap.mail.yahoo.com, port 993, SSL/TLS	smtp.mail.yahoo.com, port 465 SSL/TLS

Some older guides tell you to switch on IMAP in Gmail’s settings. Google’s help page says IMAP has been always on since January 2025, so there’s nothing to enable. Google also says Gmail no longer accepts apps that sign in with just a username and password; Outlook should open a Google sign-in window instead.

App passwords are a fallback, not the normal route. Google only offers them with 2-Step Verification and calls them not recommended. Yahoo explains how to create one under Account Security in its app password guide, for apps that can’t use Yahoo’s own sign-in page.

If it still won’t sync

• In your Google account’s security settings, check third-party connections and remove Outlook’s access, then sign in from Outlook again and allow the requested permissions. This is common advice from other users rather than a Microsoft step.
• If you use third-party antivirus with email scanning, test with that feature off, then turn it back on and add an exception for Outlook.
• If folders are the problem rather than syncing, see can’t move emails to folders in Outlook.
• As a last resort, reset Outlook to default settings or create a new profile.

Other classic Outlook errors can look similar but have different causes, such as the rules-from-the-server error. If new Outlook replaced classic Outlook on your PC, see how to get classic Outlook back.

Related guides

• “There was an error reading the rules from the server” in Outlook: how to fix it
• How to reset Outlook to default settings (classic and new Outlook)
• Can’t move emails to folders in Outlook: how to fix it
• Classic Outlook download: how to get it back on Windows 11 and 10

Official sources

• Users get errors 0x800CCC0E and 0x800CCC0F synchronizing Gmail and Yahoo accounts in classic Outlook (Microsoft Support)
• Add Gmail to another email client (Google Gmail Help)
• Generate and manage third-party app passwords (Yahoo Help)