Can't Sync two Gmail accounts in classic outlook

Question

Task 'Synchronizing subscribed folders for <mod: PII Removed>@gmail.com.' reported error (0x800CCC0E) : 'Outlook cannot synchronize subscribed folders for <mod: PII Removed>@gmail.com. Error: Cannot connect to the server. If you continue to receive this message, contact your server administrator or Internet service provider (ISP).'

Answer 1

Hello

Many users seem to have this issue recently. Microsoft is still investigating this issue. The current workaround is published here: https://support.microsoft.com/office/users-get-errors-0x800ccc0e-0x800ccc0f-synchronizing-gmail-and-yahoo-accounts-in-classic-outlook-e5a7b684-7c5c-4848-ab2d-d48291451f67

Answer 2

Error 0x800CCC0E when synchronizing Gmail in classic Outlook is a known issue related to how Gmail is connected (IMAP and Google permissions).

Use these checks and fixes:

1. Confirm Outlook build and known issue status

• Classic Outlook has a tracked issue: users get 0x800CCC0E/0x800CCC0F synchronizing Gmail accounts.
• Make sure Microsoft 365 Apps are fully updated to the latest Current Channel or other channel in use. If the problem started after a recent update and affects only Gmail, it is likely this known issue and may require waiting for the investigated fix in the March 2026 known issues list.

2. Re‑grant Google permissions for Outlook (classic Gmail add scenario) If the Gmail account was added via the Google sign‑in flow and now fails to sync:

• Remove the affected Gmail account from the Outlook profile.
• Add the Gmail account again.
• During the Google browser sign‑in, on the consent screen, ensure the box is checked for:
  • “Read, compose, send, and permanently delete all your email from Gmail.” under Select what Microsoft apps & services can access.
• If using a build at or after Current Channel Version 2412 Build 18324.20168 and an error dialog appears, use the Retry link in that error window to repeat the browser sign‑in and this time select the permission above.

Missing this permission is a documented cause of sync failures and 0x800CCC0E for Gmail in classic Outlook.

3. Verify IMAP is enabled in Gmail If the account is configured as IMAP:

• In a browser, sign in to Gmail.
• Go to Settings > Forwarding and POP/IMAP.
• Under IMAP Access, select Enable IMAP.
• Select Save Changes.

If IMAP is disabled, Outlook cannot connect and will report connection errors when synchronizing folders.

4. Confirm IMAP/SMTP server settings If the Gmail account is configured manually as IMAP in classic Outlook, verify the settings match Google’s requirements:

• Incoming (IMAP) server: imap.gmail.com, Port 993, SSL required: Yes.
• Outgoing (SMTP) server: smtp.gmail.com.
  • SSL port: 465, or
  • TLS/STARTTLS port: 587, with authentication required.
• Username: full Gmail address.
• Password: correct Gmail password or app password (if using app passwords).

5. Check SPA setting for IMAP accounts For IMAP accounts in classic Outlook that never prompt for a password or fail to connect:

• In the account’s IMAP settings, ensure Require logon using Secure Password Authentication (SPA) is unchecked.
• If needed, recreate the account via Control Panel > Mail > Email Accounts… > New, and follow the wizard, entering the Gmail address and password when prompted.

6. If only Gmail is affected and all settings are correct

• If both Gmail accounts fail with 0x800CCC0E while other account types work, and IMAP plus permissions are correctly set, the issue may match the ongoing investigation for Gmail/Yahoo sync errors in classic Outlook. In that case, keep Office updated and monitor the known issues page for resolution.

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References:

• Unable to add a Gmail account to classic Outlook
• Unable to sign in or add a Gmail account to classic Outlook
• Troubleshoot Outlook email setup
• Fix problems connecting your Google account to the Microsoft Cloud
• Fixes or workarounds for recent issues in classic Outlook for Windows