Gmail Account

Question

My Gmail account will not sync to my Office outlook. I am able to connect but I keep getting these sync error in a box.

Answer 1

Hi Herculean Embroidery, LLC

Microsoft has confirmed a known issue affecting Gmail accounts in classic Outlook for Windows that began on February 26, 2026. The issue was resolved through a Microsoft 365 service side update on March 20, 2026.

In some cases, even after the fix is applied, users may continue to see the same sync errors after changing their Gmail password. This behavior is expected because OAuth access tokens can remain valid for up to one hour. Once the token expires, Outlook should automatically prompt you to sign in again.

If you do not want to wait for the token to expire, you can manually force the sign in prompt using the supported workaround below.

• Close Outlook.
• Right click the Windows Start button, select Run, type regedit, and press OK.
• In Registry Editor, paste the following path into the address bar and press Enter: Computer\HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Common\Identity\Identities
• Under Identities, locate the subkey associated with your Gmail address and delete that identity key. After deleting the key, restart Outlook and sign in again when prompted.

For full details, please review Microsoft’s official guidance here: Users get errors 0x800CCC0E & 0x800CCC0F synchronizing Gmail and Yahoo accounts in classic Outlook

Please let me know how you get on, as your feedback is valuable to the community.

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Answer 2

Follow these steps to resolve Gmail sync errors in classic Outlook for Windows (business):

1. Confirm Outlook build has the Gmail fix
   The latest fixes for Gmail sign-in/sync issues are in these builds/channels:
   • Current Channel: Version 2404 (Build 17531.10000) or later
   • Monthly Enterprise Channel: Version 2407 (Build 17727.10000) or later
   In Outlook, go to File > Office Account > About Outlook and confirm the version/build.
   If older, choose File > Office Account > Update Options > Update Now and update Office.
2. Re‑run the Google sign‑in with full permissions (classic Outlook)
   If the account was added but sync fails with IMAP errors, the usual cause is that the Google consent box for Microsoft apps was not fully granted. In classic Outlook with the fixed build (Current Channel Version 2412 Build 18324.20168 or later):
   • When the sync error dialog appears, select the Retry link.
   • A browser window opens for Google sign‑in. Sign in to the same Gmail account.
   • On the consent screen, under Select what Microsoft apps & services can access, ensure the option is checked for:
     “Read, compose, send, and permanently delete all your email from Gmail.”
   • Complete the sign‑in and return to Outlook, then test Send/Receive.
   If the Retry flow does not appear or does not work, remove and re‑add the Gmail account and make sure that same permission is checked during the browser sign‑in.
3. Ensure IMAP is enabled in Gmail
   If the error text mentions IMAP or “may need to make changes to your Gmail settings,” verify IMAP is enabled:
   • In a browser, go to Gmail.
   • Open Settings > See all settings > Forwarding and POP/IMAP.
   • Under IMAP access, select Enable IMAP.
   • Select Save Changes.
4. Verify server settings if using manual configuration
   If the Gmail account was added manually (not via the automatic Google OAuth flow), confirm these values:
   • Incoming (IMAP) server: imap.gmail.com, SSL required, Port 993
   • Outgoing (SMTP) server: smtp.gmail.com
     • SSL: Yes
     • TLS: Yes (if available)
     • Authentication: Yes
     • Port for SSL: 465
     • Port for TLS/STARTTLS: 587
   • Username: full Gmail address
   • Password: Gmail password (or app password if using that model)
5. If still failing and using an older channel
   If the installed channel cannot yet receive the fixed build and Gmail still will not sync, temporarily switching Office update channel to one of the listed fixed channels (for example Current Channel) can be used as a workaround, then switched back after the fix is applied in the original channel.

After these steps, Outlook should connect and sync the Gmail mailbox without recurring sync error dialogs.

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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
• Fix problems connecting your Google account to the Microsoft Cloud